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THE 5th CDMA
INTERNATIONAL CONFERENCE
&
EXHIBITION
"IMT-2000 and Beyond"
Vol. Ⅱ
November 22-25, 2000
Seoul, KOREA
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Hosted byMinistry of Information & Communication(MIC)
Organized byThe Korean Institute of CommunicationSciences (KICS)The Institute of Electronics Engineers ofKorea (IEEK)Electronics and TelecommunicationsResearch Institute (ETRI)IMT-2000 Technology DevelopmentAssociation
Sponsored byInstitute of Information TechnologyAssessmentKorea TelecomLG Executive Office for IMT-2000SK TelecomShinsegi TelecomHyundai Electronics IndustriesLG ElectronicsSamsung ElectronicsEricssonMotorolaNokia NetworksNortel NetworksQualcommThe Daily Information TimesThe Digital TimesThe Electronic TimesKorea HeraldThe Korea TimesThe Jeil Economic DailyThe Naeway Economic DailyThe Seoul Economic Daily
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MESSAGE FROM THE ORGANIZING COMMITTEE CHAIR
Dear Colleagues,
It is with great pleasure that I serve as Organizing Committee chair for the 5th
CDMA International Conference (CIC). In Korea, about 25 millions subscribers are
enjoying the high quality and various services of the CDMA cellular and PCS, as of
May. 2000. Though we are going to see the real IMT-2000 services from next
year, there is still large set of many interesting and important research and
development problems to be addressed and resolved. It's appropriate to have
opportunity to share up-to-date technical advancements on CDMA technology with
many leading experts at the heart of the most densely populated CDMA users in
the world.
The 5th CIC is being prepared to see about over-all status of CDMA and to
motivate audiences to seek for possible solutions to proceed. Over recent years a
considerable amount of effort has been devoted, both in industry and academia,
towards the IMT-2000 third-generation wireless communication systems,
technologies, and applications. However, there is still a set of many interesting and
important research problems to be addressed and resolved. This conference will
also focus on fundamental challenges and issues in the fields of the 4th generation
broadband wireless communication systems, whatever it may be, which will provide
quite improvements in terms of services, data rate, capacity, flexibility, power
consumption, cost and so on. The objective of this conference is to bring together
researchers in this hot field in order to identify the fundamental challenges and
future prospects of these important areas. The 5th CIC is organizing by KICS (The
Korean Institute of Communication Sciences), IEEK (Institute of Electronics
Engineers Korea), Association for IMT-2000 Technology Development, and ETRI
(Electronics and Telecommunications Research Institute) with sponsors like world
leading CDMA/W-CDMA systems providers, and CDMA/W-CDMA service operators.
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Conference Highlights include:
CDMA Technical Presentations: 4● th Generation Mobile Systems, CDMA Radio
Technology, IMT-2000 System Development and Deployment Issues, IMT-2000
Services, and Satellite IMT-2000
Research Paper Presentation: State-of-the-art research results on the various●
fields of IMT-2000 and Beyond technology
Tutorials from world famous IMT-2000 and 4● th Generation mobile communication
system experts
Technical Tour to CDMA operators O&M center and IMT-2000 equipment●
manufacturers' sites
Technical Exhibition to demonstrate the latest IMT-2000 achievements and●
developments from manufacturers and operators
This will be a great opportunity to exchange ideas and information related to all
aspects of IMT-2000 and beyond technology. We hope you have a chance to meet
many colleagues. You will also gain an insight on the latest trends and directions
for the increasingly competitive future wireless market. On behalf of all the
organizing committee members, I sincerely invite you to this informative venue. We
hope your stay in Seoul is very comfortable.
I am looking forward to meeting you and your colleagues in Seoul in November.
Jae Moung Kim
Chairman, Organizing Committee
The 5th CDMA International Conference, Seoul
Vice President, Radio & Broadcasting Technology Laboratory
ETRI
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MESSAGE FROM THE TECHNICAL PROGRAM COMMITTEE
CHAIRS
We invite you to the 5th CDMA International Conference (CIC) of 2000 in Seoul,
Korea where the services of CDMA technology based on high capacity 2nd
generation (2G) digital cellular telephone system of IS-95 has been provided in
1996. At present, there are two pioneering CDMA cellular operators and three
CDMA PCS service providers in Korea.
Mobile cellular communication systems and wireless networking technologies are
changing rapidly. Recently, a considerable amount of efforts have been made
towards the IMT-2000 third-generation wireless communication systems,
technologies, and applications in industry, research institute and university.
However, there are still many interesting and important research problems to be
mentioned and solved. This conference will also focus on fundamental challenges
and issues in the fields of the 4th generation broadband wireless communication
systems, which will provide outstanding improvements in view of data rate, service
quality, capacity, flexibility, power consumption, mobility, price, easy usage, and
simplicity.
The 5th CIC will consist of presentations of the invited speakers from manufacturers
and service providers during one and half days, and paper presentations including
tutorials by the distinguished lecturers during two days. Especially, technical
exhibition is also scheduled in the same area.
For the Technical Program Committee, it was not easy to select papers for the
final acceptance from among the many good papers submitted to the conference.
We deeply regret rejecting some good papers due to the limited openings. We have
organized 22 Technical Sessions consisting of 20 Oral Presentation Sessions and 4
Poster Sessions, arranged in 6 parallel tracks. On behalf of TPC, we want to
express our sincere thanks to all the speakers presenting the accepted papers and
all the authors who submitted good papers. TPC invites all of you to the 5th CIC
and wish you a good experience in Seoul.
We are looking forward to seeing you and your colleagues in the 5th CIC held in
Seoul.
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TPC Chair
Dong-Ho Cho
Co-Chair
Hyuckjae Lee
Co-Chair
William C. V. Lee
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ACKNOWLEDGEMENT
The CIC had been very successful in technical and academic aspects with the
number of participants from carriers, manufactures and universities all over the
world. It is possible as a result of a particular devotion and donation. On behalf of
CIC Committee, We appreciate to all the sponsors who encourage the 5th CIC. Our
sincere thanks go to:
Sponsored by
Institute of Information TechnologyAssessmentLG Executive Office for IMT-2000Shinsegi TelecomLG ElectronicsEricssonNokia NetworksQualcommThe Daily Information TimesKorea HeraldThe Jeil Economic DailyThe Seoul Economic Daily
Korea TelecomSK TelecomHyundai Electronics Industries Co.,Ltd.Samsung ElectronicsMotorolaNortel NetworksThe Electronic TimesThe Digital TimesThe Korea TimesThe Naeway Economic Daily
Exhibition
Korea TelecomSamsung ElectronicsHyundai Electronics Industries Co.,Ltd.LG TeleCom, Ltd.
Agilent TechnologiesANRITSU CORPORATION, LIMITEDTektronix Korea, Ltd.Mediacomm, Inc.KMW Inc.SysOnChip, Inc.Tricomtek Co., Ltd.NEO TELECOM CO., LTD.KOREA NETWORK COPORATIONADDCOM INFORMATION, INC.Picture Map International Co. Ltd.Wilitech, Inc.Young-il Education System Co., Ltd.
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THE 5TH CIC COMMITTEES
International Advisory CommitteeChair Seon Jong Chung (ETRI, Korea)
Co-Chair Keum-Chan Whang (KICS, Korea) Do Hyun Kim (IEEK, Korea)
Vice-Chai
rWilliam C.Y.Lee(LinkAir Communications, USA)
Members Ok Hwan Song (ITDA)
Jung Nam Cho(SK Telecom,
Korea)
Dae Ki Kim(Shinsegi Telecomm,
Korea)
lee Jin Chung(KTM.COM, Korea)
Pyoungwon Suh(LG Electronics,
Korea)
Jong-Yong Yun(Samsung, Korea)
Takashi Lida(CRL, Japan)
Craig Farrill(CDG, USA)
Janos Fugedi(Ericsson, Sweden)
Mitsutoshi Hatori(Univ.of Tokyo,
Japan)
Sang Bin Rhee(Lucent
Technology, Korea)
Kyecheol Lee(Korea Telecom,
Korea)
Kyu Suk Chung(DACOM, Korea)
Yong-Kyung Lee(KT Freetel,
Korea)
Yong Nam(LG Telecom, Korea)
Chong Sup Park(Hyundai, Korea)
In-Sik Oh(Motorola, Korea)
Laary Paulson(Nokia Networks,
Finland)
Irwin Jacobs(Qualcomm, USA)
Soo-Jin Chung(Nortel Networks,
Korea)
Kenkichi Hirade(NTT DoCoMo,
Japan)
Laurence Milstein(UCSD, USA)
Secretary Jae Moung Kim(ETRI, Korea)
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Organizing CommitteeChair Jae Moung Kim (ETRI, Korea)
Advisor Hang Gu Bahk (Hyundai)Chung Kun Lee (KT Freetel)
Hyuckjae Lee (ICU)
Co-Chair Kyong Joon Chun (Samsung)Yongil Choi (LG Electronics)
Myung Sung Lee (SK Telecom)
Vice-Chair Jong Suk Chae (ETRI)
Co-Vice-Chair
un Ick Lee (SK Telecom)Young Chu Cho (Korea Telecom)Youngbok Kee (Ericsson)Jae Ha Park (Motorola)Ristimaki Julia (Nokia Networks)Soon Ho Hong (Samsung)Ki Chul Han (ITDA)Joo Hwan Lim (KICS)
Byung Chun Ko (ShinsegiTelecomm)Jong Won Chae (LG IMT-2000)Jong Myung Rhee (HanaroTelecom)Sung Woo Kim (Qualcomm)Kyung Nam Hong (NortelNetworks)In Cheol Shin (Hyundai)Kyu Soo Chung (Pantech)Hong Tae Jeon (lEEK)
Publicity Sang-Woo Nam (ETRI)Dong Hyun Hwang (ShinsegiTelecomm)Man-Hyuck Lee (Agilent Tech.)
Weon Gook Chung (LG Electronics)Heung Ryeol You (Korea Telecom)
Publication Jac-Ick Choi (ETRI) Pan-Jong Park (LG IMT-2000)
Treasurer Dae Sik Kim (ETRI) Yoon Deok Lee (Samsung)
Finance Sung Dae Kim (ETRI) Hae Nam (ETRI)
LocalArrangement
Songin Choi (ETRI) Eungbae Kim (ETRI)
Exhibition Yong-Seok Choi (ETRI) Mm Soek Oh (LG IMT-2000)
Registration Hyun Seo Oh (ETRI) Jung Soo Kim (Hyundai)
Secretary Mintaig Kim (ETRI)Khilhyung Lee (CIC Secretariat)
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THE 5TH CIC COMMITTEES
Steering CommitteeChair Jong Suk Chae (ETRI)
Members
Dae Sik Kim (ETRI)Dong Hyun Hwang (ShinsegiTelecom)Yoon Deock Lee (Samsung)Sung Chan Son (Hanaro Telecom)Weon Gook Chung (LG Electronics)Terry Yen (CDG)Eungbae Kim (ETRI)Yong-Seok Choi (ETRI)Sang-Woo Nam (ETRI)
Jae-Ick Choi (ETRI)Byung Jun Mm (5K Telecom)Mm Soek Oh (LG IMT-2000)Jung Soo Kim (Hyundai)Young Chang Han (Nokia Networks)Sung Dae Kim (ETRI)Songin Choi (ETRI)Hyun Seo Oh (ETRI)Yeong Mm Jang (Duksung Women'sUniv.)
Secretary
Mintaig Kim (ETRI)
Technical Program CommitteeChair Dong Ho Cho (KAIST)
Co-Chair Hyuckjae Lee (ICU) William C.Y.Lee (LinkAirCommunications)
Vice-Chair
Singo Obmori (CRL, Japan)Chang-Joo Kim (ETRI)
Tero Ojanpera (Nokia, Finland)Kyung Sup Kwak (Inha Univ.)
Members Youngnam Han (ICU)Daehyoung Hong (Sogang Univ.)Soo In Lee (ETRI)Dong Ku Kim (Yonsei Univ.)Cheol Sung Kim (ChonnamNational Univ.)Young Ki Kim (Samsung)Young Ki Cho (KyungpookNational Univ.)Seung Chan Bang (ETRI)Tae Won Oh (Korea Univ.)Kyung Guen Lee (Sejong Univ.)Pan-Jong Park (LG IMT-2000)Masaharu Hata (NTT DoCoMo)Paul K.M.Ho (Simon Fraser Univ.,Canada)Chai-Keong Toh (Georgia Tech.,USA)Bijan Jabbari (George MasonUniv., USA)Edward P. Dawson (QueenslandUniv., AU)Zang Ping (BUPT, China)Erik Dahiman (Ericsson, Sweden)T. Zollver (Infineon Tech. AG,Germany)
Sang-jae Moon (Kyungpook NationalUniv.)Nak-Myeong Kim (Ewha Women'sUniv.)Kwang Bok Lee (Seoul National Univ.)Sang Wu Kim (KAIST)Joon Mo Koo (SK Telecom)Young Woo Kim (Hyundai)Pyeong-Jung Song (ETRI)Kyungsoo Lee (KT Freetel)Seong-Rag Kim (ETRI)Chul Huem Yon (LG Electronics)Seong-Cheol Kim (Seoul National Univ.)Jae Sung Lim (Ajou Univ.)Tae Geun Kim (Korea Telecom)K.C.Chen (National Taiwan Univ.,Taiwan)Joseph Chang (CCL, Taiwan)Susumu Yoshida (Kyoto Univ., Japan)Bo Li (HK Univ. of Sci. & Tech.,China)Gutierrez Alberto (Motorola, USA)
Secretary Yeong Mm Jang (DuksungWomen's Univ.)In-Kyeong Choi (ETRI)
Byung Cheol Kim (Chungnam NationalUniv.)
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PROGRAM SCHEDULE - ATA GLANCE
Day 1 : November 22.2000(Wednesday)
Day 2 : November 23.2000(Thursday)
Day 3 : November 24.2000(Friday)
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Day 4 : November 25.2000(Saturday)
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FLOOR MAP
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TABLE OF CONTENTS
VOLUME I
Day 1 : November 22 (Wednesday)
Session S1 : Opening Session (10:00-10:30, Wednesday, November 22, 2000)
● Opening Address
Keum-Chan Whang, President, KICS, Korea
● Congratulatory Address
Byung Yub Ahn, Minister, MIC, Korea
● Welcome Address
Seon Jong Chung, President, ETRI, Korea
Session S2 : Plenary Session (10:30-12:30, Wednesday, November 22, 2000)
● Content as the Key to 3G Success - Preparing for Unprecedented Growth in
Wireless Services as Applications
Sari Baldauf, President, Nokia Networks, Finland
● What will be the 4th Generation Mobile Systems
William C. Y. Lee, Chairman, LinkAir Communications, USA
● The Strategic Value of Open Interfaces in Wireless Networks
Larry Brittain, Vice President, Ericsson, USA
● CDMA Evolution in Korea
Kyong Joon Chun, Vice President, Samsung Electronics, Korea
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Day 1 : November 22 (Wednesday)
Session S3 : 3rd Generation CDMA Technology (14:00-15:40, Wednesday, November
22, 2000)
● Status of IMT-2000 System and 4G Mobile System R&D in China
Zhang Ping, Beqing Univ. of Posts and Telecom., China
● Convergence of Fixed-Mobile Communications and Applications
Pan-Jong Park, Vice President, LG Executive Office for IMT-2000, Korea
● Resource Allocation and Power Control for UMTS
Phil Thomas, Director, Nortel Networks, France
● Wireless Multimedia Services Infrastructure of IMT-2000 from Operator's Point of
View
Chulhye Park, Director, Korea Telecom, Korea
Session S4 : 3rd Generation CDMA System and Evolution (16:00-18:30, Wednesday,
November 22,2000)
● Perspectives on 3GPP and 3GPP2 Standardization
Tero Ojanpera, Vice President, Nokia Networks, Finland
● Radio Planning and Deployment of 3G Networks
Bum Kwon, Manager, SK Telecom, Korea
● Security Issues for the Next Generation Mobile Networks
Ed Dawson, Director of ISRC, Queensland Univ. of Tech., Australia
● High-Speed Data Services using cdma2000 System
Dongsoo Park, Senior Manager, Samsung Electronics, Korea
● Mobility Issues in All IP Network
Jaehong Park, Senior Standardization Manager, Hyundai Electronics, Korea
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Day 2 : November 23 (Thursday)
Session S5 : IMT-2000 Development, Field Test and Deployment (09:30-11:00,
Thursday, November 23, 2000)
● WCDMA Field Trials and Experiences Around the World
Masanobu Fujioka, General Manager, Nippon Ericsson K.K., Japan
● 3G System Platform for UMTS and cdma2000
Jae-ho Ryoo, Senior Manager, LG Electronics, Korea
● Field Trial Results and Development Plan for W-CDMA
Takashi Ueda, NTT DoCoMo, Japan
Session S6 : High-speed Mobile Internet System and Service (11:20-12:35,
Thursday, November 23, 2000)
● Enabling High-Speed Wireless Internet Access
Jong-Wook Myung, Director, Qualcomm Korea, Korea
● High-Speed Internet Access using 1Xtreme - cdma2000 1X and Beyond
Jaeman Koh, Senior Manager, Motorola, Korea
● The Status and the Future of GPRS Networks
Joakim Wiklund, Ericsson, USA
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Day 2 : November 23 (Thursday)
Session S7: 4th Generation Mobile Systems (14:00-16:00, Thursday, November 23,
2000)
● SDR and Its Application to 3G and Beyond
John D. Ralston, Vice Chairman. SDR Forum
● An Architecture for Mobile Communication Systems Beyond Third Generation
Werner Mohr, Josef Urban, and Dave Wisely, BRAIN Project, Siemens AG, Germany
● Research Activities on Multimedia Mobile Communication Systems in
Millimeter-Wave Bands
Toshio Ihara, Director, CRL, Japan
● Enabling Technology Issues for Beyond 3G in Korea
Mun Geon Kyeong, Director, ETRI. Korea
● The Scope and Requirements of the System Beyond IMT-2000
Young Kyun Kim, Vice Chairman ITU-TSG IMT-2000 & Beyond, Korea
Session S8: Panel Discussion (17:00-18:30, Thursday, November 23, 2000)
● Migration Path from 2G to 3G and Beyond
Jon g-Wook Myung, Qualcomm
Masanobu Fujioka, Ericsson
Tero Ojanpera, Nokia
Jaeman Koh, Motorola
Daehyoung Hong, Sogang Univ.
Werner Mohr, Siemens
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VOLUME Ⅱ
Day 3 : November 24 (Friday)
Session A1 : CDMA System
A1.1 Joint Space Time Adaptive Processing and Multi-User Detection for Reverse
Link IS-95 CDMA Reception with Experimental Results (Invited)
Joseph C. Liberti, Shimon Moshavi, Telcordia Technologies, USA
A1.2 Vestigial Sideband Wideband CDMA for Overlay System and its Implementation
(Invited)
Dong Ku Kim, Young-Kwan Choi, Sung Woo Kwon, Moon Ki Lee, Yonsei Univ.,
Dong Wook Roh, LGIC, Korea
A1.3 Study of a MFSK/FH-SSMA Wireless System with Double-Media Services
Wing C. Kwong, Hofstra Univ., USA, Guu-Chang Yang, Shang-Yao Lin, National
Chung-Hsing Univ., Taiwan
A1.4 Design and Evaluation of an All-Digital Multi-Rate BPSK Direct-Sequence
Spread-Spectrum Baseband transceiver Architecture for Indoor Applications
P. Melet, L. Andrieux, S. Bourdel, F. Campo, ICARE Research group, LAAS, A.
Cazarre, CNRS, LAAS, France
A1.5 Software Radios with Flexible Channel Coding for a Perfect Power Controlled
DS/CDMA System in an AWGN Channel
M. Sridharan, Indian Institute of Technology, D.Rajaveerappa, Cochin Univ., India
Session A2 : Channel Estimation
A2.1 Phase Estimation and Performance Analysis for SSB/BPSK - DS/CDMA
So Young Ahn, Myoung Seob Lim, Chonbuk National Univ., Korea
A2.2 A Data-Aided Channel Estimation Technique for Coherent DS/CDMA Systems
Using Maximum Doppler Frequency Estimation and Blind Spreading Factor Detection
Kwang Soon Kim, ETRI, Korea
A2.3 Robust Channel Estimation Methods for the Space Time Transmit Diversity
Receiver in the W-CDMA IMT-2000 System
Seok Ho Won, II Gyu Kim, Seung Chan Bang, ETRI, Whan Woo Kim, Chungnam
National Univ., Korea
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Day 3: November 24 (Friday)
Session A3 : Diversity
A3.1 Experiments on Adaptive Antenna Array Transmit Diversity in W-CDMA
Forward Link
A. Harada, S. Tanaka, M. Sawahashi, NTT DoCoMo, F. Adachi, Tohoku Univ., Japan
A3.2 Performance Limitation of TAD in FDD Mode over Fast Rayleigh Fading
Channels
Jinho Choi, Konkuk Univ., Yong Up Lee, Hallym Univ., Korea
A3.3 Comparison of WCDMA Uplink Antenna Solutions with 4 Receiver Branches
Antti Tolli, Harri Holma, Nokia, Finland
A3.4 Performance Evaluation of the Hybrid Transmission Diversity based on Space
Time Spreading (STS) for cdma2000
II-Sung Chung, Chang-Seok Lee, Yeonwoo Lee, Kyun-Hyon Tchah, Korea Univ.,
Jon g-Seok Koh, Korea Telecom, Korea
A3.5 Multiple Antenna Transmission Utilizing Side Information for WCDMA Systems
Jyri Hamalainen, Risto Wichman, Nokia, Finland
Session A4: Power Control
A4.1 Adaptive Rate and Power DS/CDMA Communications in Fading Channels
(Invited)
Sang Wu Kim, KAIST, Korea
A4.2 Improvement of Fixed-step and Multi-step Reverse Link Power Control in
DS-CDMA Cellular Mobile Radio System
Jenjoab Virapanicharoen, Watit Benjapolakul, Chulalongkom Univ., Thailand
A4.3 Outer Loop Power Control Effect on Forward Link Capacity of CDMA Systems
Hoon Kim, Jayong Koo, Youngnam Han, ICU, Seung-Chan Bang, ETRI, Korea
A4.4 SIR-Based Power Control in Third Generation CDMA Systems
A. Kumiawan, S. Perreau, K. Lever, Univ. of South Australia, Australia, J. Choi,
Konkuk Univ., Korea
A4.5 cdma2000 Forward Link Open Loop Power Control
Vieri Vanghi, Aleksandar Damnjanovic, Ericsson, USA
A4.6 An Outer-Loop Power Control for IMT-2000 System Based on Leaky Bucket
Scheme
Byung Rae Park, Jea Sung Lee, Gi Joon Jeon, Kyungpook National Univ., Yeong Min
Jang, Duksung Women's Univ., Korea
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Day 3: November 24 (Friday)
Session B 1 : Coding/Modulation
B1.1 Concatenated Channel Decoding with Space Time Block Codes and Differential
M-PSK Demodulation (Invited)
Hongjun Xu, Guilin Institute of Electronic Technology, China, Kyung Sup Kwak, Inha
Univ., Korea
B1.2 Multi-band Multi-Channel Joint Detection for 16QAM/DS-CDMA Systems for
High Rate Transmission (Invited)
Dong Ku Kim, Moo-Yeon Woo, Young-Kwan Choi, Jon g-Han Won, Hyun-Jeong
Kim, Jong-Hun Rhee, Yonsei Univ., Korea
B1.3 A Variable Rate Channel Coding with Interleaved Puncturing Serially
Concatenated Convolutional Code
Cha-Keon Cheong, Youn-Moon Lee, Hoseo Univ., Korea
B1.4 Parallel Concatenated Gallager Codes
Hatim M. Behairy, S. C. Chang, George Mason Univ., USA
B1.5 A New TD-OFDM System for Reducing ICI in Wireless Time-Variant Fading
Channel
Tong Xuejian, Yue Guangxin, Beijing Univ., China
Session B2: Turbo Coding
B2.1 A Turbo Coded Multicarrier DSIC DMA System with Unequal Error Protection
on the Encoder Output Bits
Yun Hee Kim, Kwang Soon Kim, ETRI, lickho Song, KAIST, Korea
B2.2 Performance Improvement of Turbo Code with Increased Free Distance and
Scaling Factors for Decoding
In-Bum Chang, Tae-Young Chang, Jae-Hwan Kwon, Kyun-Hyon Tchah, Korea
Univ., Joon-Ho Lee, Korea Telecom, Korea
B2.3 Performance of Block Turbo Codes in Mobile Satellite Communication Systems
Jihye Gwak, ETRI, Korea
B2.4 W-CDMA Systems Using Turbo Code of Short Frames in JTC Wideband
Channel Model
Sung-Jae Yoon, Seong-Chul Cho, Cheol-Sung Kim, Chonnam National Univ., Korea
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Day 3: November 24 (Friday)
Session B3 : Signal Processing
B3.1 On Optimum CDMA System over Additive Colored Gaussian Noise
Akira Kanaoka, Yoichi Sato, Toho Univ., Japan
B3.2 Adaptive Neural Network Based Receivers for Multirate Synchronous
DS-CDMA Systems
Lei Huang, Fu-Chun Zheng, Victoria Univ., Australia
B3.3 Direct Digitization for Software Radio-Based Multi-Band CDMA Systems Using
Bandpass Sampling
Jiyeon Kim, Seoyoung Lee, ETRI, Korea
B3.4 Characterization of 125 Watt Single-Ended Power Discrete LDMOS Device for
W-CDMA Base Station Amplifier Application
Antoine Rabany, Long Nguyen, John Kinney, Motorola, USA
B3.5 Spread-spectrum Communication Systems Correlated with the Proposed
Wavelet-based Signal Processing for Noise Suppression
Thuong Le-Tien, Chien Hoang-Dinh, Dung Ho-Quang, Nhan Nguyen-Duong-The,
Hoa Le-Minh, Kha Ha-Hoang, National Univ. Of Ho Chi Minh City, Viet Nam
Session B4 : Synchronization
B4.1 Nonconsecutive Search and Joint Triple-Cell Detection for Code Acquisition in
Multipath Fading Channels
Oh-Soon Shin, Kwang Bok Lee, Seoul National Univ., Korea
B4.2 Fast Cell Search Algorithm and its Performance for Broadband Multi-carrier
CDMA Wireless Access
Yukiko Hanada, Kenichi Higuchi, Mamoru Sawahashi, NTT DoCoMo, Japan
B4.3 Fast Cell Search Technique in IMT-2000 W-CDMA Systems Using
Correlation-aided DSA (CDSA)
Byoung-Hoon Kim, Byeong-Kook Jeong, Byeong Gi Lee, Seoul National Univ.,
Korea
B4.4 An Environmental Robust PN Code Acquisition Architecture in DS-CDMA
Systems
Hae-Sock Oh, Dong-Seog Han, Kyungpook National Univ., Chang-Joo Kim, ETRI,
Korea
B4.5 Neighbor Cell Search Scheme Using Partial Interference Cancellation of
Primary
II Gyu Kim, Seok Ho Won, Seung Chan Bang, ETRI, Ja Yong Koo, ICU, Korea
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Day 3: November 24 (Friday)
Session C1 : Smart Antenna
C1.1 On the W-CDMA System with Smart Antenna in Realistic Wideband Channel
(Invited)
Cheol-Sung Kim, Byoung-Hak Kim, Hyoung-Oh Bae, Chonnam National Univ., Korea
C1.2 Adaptive Array with Adaptive Convergence Parameter for CDMA Wireless
Communications
Yoo S. Song, Hyuck M. Kwon, Wichita State Univ., Kyung. Y Mi NeoReach Inc.,
USA
C1.3 Performance Gain of Smart Dual Antennas at Handsets in 3G CDMA System
Suk Won Kim, Dong Sam Ha, Virginia Tech., USA, Jeong Ho Kim, LG Electronics,
Korea
C1.4 Multi-channel RF Transceiver Calibration for Adaptive Array Antenna System
Hyeong Geun Park, Jae Ho Jung, Mun Geon Kyeong, ETRI, Korea
C1.5 Downlink Beamforming Weight Generation in FDD Wireless Communication
Systems
Pil Kwan Kim, Seong Keun Oh, Ajou Univ., Korea
Session C2 : RF
C2.1 Electromagnetic Coupling Mechanism in the Aperture Coupled Microstrip
Antenna and Its Applications to Antenna Structures in the Wireless Communication
Areas (Invited)
Young Ki Cho, Kyungpook National Univ., Korea
C2.2 Broadband Technique of Ceramic Antenna to cover PCS/IMT-2000 band
Jung-lck Moon, Seong-Ook Park, ICU, Korea
C2.3 The Design of the Intermodulation Signal Extraction Circuit in the High Power
Amplifier
Ung Hee Park, ETRI, Ik Soo Chang, Sang Won Yun, Sogang Univ., Sang Dae Nam,
KMW, Korea
C2.4 Active Microstrip Antenna Fed by Coplanar Waveguide
Eko T. Rahardjo, Adityo Knstianto, Harry S. Soetjokro, Djoko Hartanto, Univ. of
Indonesia, Indonesia
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Day 3: November 24 (Friday)
Session C3 : RF/Propagation
C3.1 Performance Projections of SiGe HBTs for LNAs in CDMA Mobile
Communication Systems
Jeiyoung Lee, Shiming Zhang, Guofu Niu, John D. Cressler, Auburn Univ., USA,
Namyoung Kim, Kwangwoon Univ., Geunho Lee, MIC, Korea
C3.2 On the Statistics of W-CDMA Signals over Indoor Wideband Multipath Channel
Dong-Jin Oh, GueeSang Lee, DeokJae Choi Cheol-Sung Kim, Chonnam National
Univ., Korea
C3.3 DC/DC-Modules Sensitivity to RF Electromagnetic Fields - Testing Procedure
Borivoj Modlic, Kresimir Malaric, Univ. of Zagreb, Boris Regvart, Independent
Telecom Power Consulting, Croatia
C3.4 The Stub Matched Oscillator Design Technique
Joosung Lee, II-Kyoo Lee, Heonjin Hong, Jae-ick Choi, ETRI, Korea
C3.5 The Statistical Characteristics of the Power over the Rayleigh Fading Channel
Gu Jian, Yang Dacheng, Wang Wenbo, Beijing Univ., China
Session C4 : Multi-User Detection
C4.1 A Kurtosis Based Blind Adaptive Decorrelating Detector in Multipath CDMA
Channel (Invited)
Changjiang Xu, Nanjing Univ., China, Kyung Sup Kwak, Inha Univ., Korea
C4.2 Successive Multiuser Interference Canceller Using Turbo Codes for DS-CDMA
(Invited)
Taichi Ikuma, Shouichi Hirose, Hidekazu Murata, Susumu Yoshida, Kyoto Univ.,
Japan
C4.3 Group-wise Parallel Interference Cancellation for DS-CDMA Systems with
Unequal Transmitted Powers
In-Kyeong Choi Seong Rag Kim, Nam Jin Park, Young Wha Kim, ETRI, Korea
C4.4 Blind Adaptive Detection with Gradient Adaptive Step Size for DS/CDMA
Systems
K. W Wong, Tim 0'Farrell, Leeds Univ., UK
C4.5 Interference Cancellation of a Multicarrier DS/CDMA System Based on Order
Statistics
Jin Young Kim, SK Telecom, Korea
- 24 -
Day 3: November 24 (Friday)
Session D1 : Location Management
D1.1 E-911 Location Technologies and Location Commercial Applications
S.S. (peter) Wang, Marilynn Green, Maged Malkawi, Nokia, Finland
D1.2 Simulation of Region-based Mobile IP For Supporting Micro-Mobility
JeeHyeon Na, EunHee Hyun, Sung-Hee Kim, ETRI, Jae-Ho Kim, Ki-II Kim,
Sang-Ha Kim, Chungnam National Univ., Korea
D1.3 Location Forecast Scheme Using the Differential Value of Received Signal
Strength Indicator at Mobile Station Handoff Time
Seong Gon Choi, Jun Kyun Choi, ICU, Hee Young Jung, ETRI, Bo Fun Nam, Kyung
Hee Univ., Korea
D1.4 Effective Location Management Strategy Using Multicasting HLR in Mobile
Environments
Youngchul Cha, Jaejin Lee, Korea Telecom, Korea
Session D2 : Handover
D2.1 Performance Analysis of Trunk Network for Soft Handoffs Between MSC's in
CDMA Cellular Systems
Woo- Yong Choi, Hyundai, Korea
D2.2 A Hierarchically Adjustable Handoff Algorithm for Cellular Communication
Systems
Woogoo Park, Yongseok Choi, ETRI, Korea
D2.3 Domain-based Handoff Method in DIAMETER Mobile IP Networks
Jung Mo Moon, Sung Hee Kim, ETRI, Korea
D2.4 Fuzzy Inference System based Adaptation of CDMA Soft Handoff Thresholds
with Different Defuzzification Schemes
Bongkam Homnan, Vikom Kunsriruksakul, Watit Benjapolakul, Chulalongkom Univ.,
Thailand
- 25 -
Day 3: November 24 (Friday)
Session D3 : Wireless System
D3.1 Systems beyond IMT-2000 to the Fourth Generation Mobile Communications
(Invited)
Masaharu HATA, Nobuo Nakajima, NTT DoCoMo, Japan
D3.2 Local Multipoint Distribution Service (LMDS) Broadband Wireless Access
technology - Physical layer approaches and Standardization
K.V.Ravi, Centre for Wireless Comm., Singapore, Y.S.Rao, Qualcomm, USA, M.N.Roy,
Univ. of Jadavpur, India
D3.3 Fixed Wireless Access System Attaining 1Gbps/cell within 120 Bandwidth:㎒
The Performance of a Test Modem and Power Control Simulation
Noboru Izuka, Tetsuya Yuge, Yoshimasa Daido, Japan Telecom, Japan
D3.4 System simulator for UTRA TDD
Janne Kurjenniemi, Tapani Ristaniemi, Univ. of Jyvaskyla, Seppo Hamalainen, Nokia,
Finland
D3.5 Transmission Buffer Dimensioning for Markov Modulated Fading Channels
Yeong Min Jang, Duksung Women's Univ., Korea
Session D4 : Wireless Internet/Security
D4.1 Public Key Infrastructure for Future Wireless Networks (Invited)
Ed Dawson, Selwyn Russell, Queensland Univ., of Technology, Australia
D4.2 Design and Implementation of Web Security System Using Domestic Encryption
Algorithm
Sung-Han Kim, Haeng-Suk Oh, ETRI, Sang-Soo Park, Bong-Hwan Lee, Taejon
Univ., Korea
D4.3 An Efficient Packet Fair Queueing Algorithm for the High Speed Wired
Networks and Its Expansion to the Wireless Networks and Its Expansion to the
Wireless Networks
Nam-Seok Ko, Dong-Yong Kwak, Yool Kweon, Jung-Sik Kim, ETRI, Hong-Shik
Park, ICU, Korea
D4.4 TCP Performance Enhancement Using Mobile Agents in Mobile IP Environment
S.C.Song, Si-Nam Woo, Jae-Won Kim, Yeun Joong Kim, Ji Young Lee, Sun-Shin An,
Korea Univ., Korea
D4.5 Design of a Gi+ Interface between GGSN and FA for UMTS/GPRS
HyunGon Kim, JeeHyeon Na, YeongJin Kim, ETRI, Korea
D4.6 Mobile Agent Management for intelligent services over JAIN
Ji- Young Lee, Yeun Joong Kim, S.C. Song, Don g-Ho Kim, Si-Nam Woo, Jae-Won
Choi, Sun-Shin An, Korea Univ., Korea
- 26 -
Day 3: November 24 (Friday)
Session E1 : System Capacity
E1.1 Performance Evaluation of Voice/Data Integrated CDMA Networks with QoS
Constraints
Fumio Ishizaki, Nanzan Univ., Japan
E1.2 Signal Power and Interference Analysis of Spectrally Overlaid Macro/Micro
Cellular CDMA Systems
Chang Soon Kang, ETRI, Dan Keun Sung, KAIST, Korea
E1.3 Capacity Evaluation of DS-CDMA with Imperfect Power Control and Restricted
Dynamic Range of Transmission Power
Takehiro Suzuki, Takeshi Hattori, Sophia Univ., Japan
E1.4 TDD/CDMA Capacity Loss due to Adjacent Channel Interference in the
Manhattan Environment
Ling Li, Yang Dacheng, Wang Wenbo, Miao Qingyu, Beijing Univ., China
E1.5 The Analysis and Simulation on the CDMA Downlink Capacity
Yang Guang, Yang Dacheng, Wang Wenbo. Beijing Univ., China
Session E2 : Call Admission Control
E2.1 Chernoff Bound and the Refined Large Deviation Approach for Connection
Admission Control in IMT - 2000 Systems (Invited)
Yeong Min Jang, Duksung Women's Univ., Korea
E2.2 Local and Global Transmitted Power based Call Admission Control with
Priorities in IMT - 2000 Wideband CDMA systems
Nikos Dimitriou, Rahim Tafazolli, Univ. of Surrey, UK
E2.3 Novel Admission Control Scheme for Soft Handoff in DS-CDMA Cellular
Systems Supporting Voice and Stream-Type Data Services
Jin Weon Chang, Hyun Woo Lee, Dan Keun Sung, KAIST, Korea
E2.4 Adaptive Connection Admission Control for QoS Support in 3G Mobile
Networks
Sang-Ho Lee, Dong-Soo Jung, ETRI, Sung-Woo Park, Hannam Univ., Korea
- 27 -
Day 3: November 24 (Friday)
Session E3 : Multiple Access
E3.1 A Queuing Priority Channel Access Protocol For Voice/Data Integration on the
Air Interface of Microcellular Mobile Radio Network
Mostafa Nofal, N. EI-fishawy, Saied Abd EI-atty, Faculty of Electronic Engineering,
Menouf, Egypt
E3.2 A MAC Protocol Using Discrete Fair Queueing Algorithm for Wireless
Multimedia Networks
Suwon Lee, Kiseon Kim, Changhwan Oh, Kwangju Institute of Science and
Technology, Korea
E3.3 A Comparison of WCDMA Network Performance Results with Frame vs Slot
Resolution Simulations
Raymond Kwan, Mika Rinne, Nokia, Finland
E3.4 Enhanced-Reservation Code Multiple Access (E-RCMA) for Enhancing Voice
Traffic Quality
EuiHoon Jeong, Chungll Yeh, BeobJu Kang, ETRI, SeungRyoul Maeng, KAIST, Korea
E3.5 A Distributed Request based CDMA Reservation ALOHA for Mobile
Multi-media Integrated Cellular Systems
Kyeong Hur, Jeong-Sik In, Yong Suk Kim, Kyun Hyon Tchah, Korea Univ., Joon-Ho
Lee, Korea Telecom, Korea
Session E4 : Resource Allocation
E4.1 An Efficient Channel Allocation Scheme for Multicast Traffic in Multitier
Cellular Systems
II Han, Dong-Jun Lee, Dong-Ho Cho, KAIST, Korea
E4.2 Adaptive data rate transmission in CDMA networks over time varying traffic
channel
Kwonhue Choi, Taegon Kwon, Sungpal Lee, ETRI, Kyungwhoon Cheun, Pohang
Univ. of Science and Technology, Korea
E4.3 Fractional Channel Reservation in Integrated Voice/Data DS-CDMA Systems
Felipe A. Cruz-Perez, Domingo Lara-Rodriguez, Mauricio Lara, CINVESTAV-IPN,
Mexico
E4.4 The Investigation on the Data Transmission Control Schemes Based on
cdma2000
Yang Guang, Yang Dacheng, Wang Wenbo, Beijing Univ., China
E4.5 The Performance Analysis of Dynamic Channel Allocation in Different Cellular
Topology
Shao Yubin, Long Hua, Yao Shaowen, Xu Mingyuan, Kunming Univ., China
- 28 -
Day 3: November 24 (Friday)
Poster Session F1 : CDMA Modem I
F1.1 Asynchronous Multi-Rate Receiver Structures for Interference Cancellation in
IMT-2000 3GPP Systems
Moon Sup Jung, Seong Keun Oh, Myung Hoon Sunwoo, Young Serk Shin, Ajou Univ.,
Korea
F1.2 Performance of Multiuser Detectors for Hybrid TDMA/CDMA Systems
Ock-Woo Nam, Jae-Hyung Kim, Changwon National Univ., Fung-Bae Kim, ETRI,
Korea, Paul K.M. Ho, Simon Fraser Univ., Canada
F1.3 Efficient Performance Evaluation Method for DS-CDMA Communication Systems
Seung-Ik Lee, Hwi-Won Park, In-Kwan Hwang, Chungbuk National Univ., Korea
F1.4 Design and Implementation of the Wireless LAN RF Transceiver at 5 Band㎓
Bonghyuck Park, Hae Won Jung, Jaejung Lee, Hyeong Ho Lee, ETRI, Korea
F1.5 High-Rate, Low Power SST (Scarce State Transition) Scheme Viterbi Decoder
Employing 4-Way ACS Units
Sang-Cheon Kim, Jun Dong Cho, Sungkyunkwan Univ., Korea
F1.6 The Method of Measuring Large-Signal S-Parameters of High Power Transistor
with Normal Condition
Ung Hee Park, ETRI, Seok Kyun Park, Ik Soo Chang, Sogang Univ., Korea
F1.7 Pathloss Measurement at 60 ㎓
Yang-Su Kim, Jong-Ho Kim, Joo-Hwan Lee, Yong-Seok Choi, ETRI, Korea
F1.8 Jitter Reduction in Carrier Frequency Recovery Loops Based on Overlapped
Observations
Hyoungsoo Lim, Sooyoung Kim Shin, Seong Pal Lee, ETRI, Korea
F1.9 CDMA Channel Selector for Satellite Communications Systems
Nakseon Seong, Soonik Jeon, Dukgil Oh, ETRI, Korea
F1.10 Design and performance Analysis of a CE-CPSK Modulated Digital DLL in a
DS-CDMA Receiver
Jin-Dam Mok, Hee-Chang Chung, ETRI, Seong-Cheol Kim, Woosong Univ., Korea
F1.11 Dual Band Antenna for PCS & IMT-2000
Joo Seong Jeon, Jang Wook Kim, Korea Telecom M.com, Korea
F1.12 Empirical Prediction Model of Rain Attenuation on the Korean Satellite Path
Joo-Hwan Lee, Yang-Soo Kim, Jong-Ho Kim, Yong-Seok, Choi, ETRI, Korea
F1.13 Performance Analysis of Multi-Code CDMA System
Hyung-Yun Kong, II-Seung Woo, Univ. of Ulsan, Korea
Poster Session F2 : CDMA Modem II
F2.1 Bit Constraint Parameter Decision Method for CDMA Digital Demodulator
Kyungtae Han, Iksu Eo, Kyungsu Kim, Hanjin Cho, ETRI, Korea
F2.2 Modified Systolic Array Structure-based Covariance Inversion Method Applied
- 29 -
to MMSE Space-Time Array Receiver
Jae Joon Park, Mun Geon Kyeong, ETRI, Won Cheol Lee, Soongsil Univ., Korea
F2.3 Adaptive Rain Fade Compensation Technique and Its Performance Evaluation
Sooyoung Kim Shin, Kwangjae Lim, Hyoungsoo Lim, Taegon Kweon, Soo In Lee,
ETRI, Korea
F2.4 A Study on the Interference from a NGSO Satellite Constellation into a GSO
Satellite Network
Byung-Su Kang, Tae-Gon Kwon, Seong-Pal Lee, ETRI, Korea
F2.5 Structure and Performance Analysis of LMDS Uplink using Multicarrier
DS-CDMA (MD-CDMA)
Hee Chang Jung, ETRI, Byung Lok Cho, Hyung Rae Lim, Sunchon National Univ.,
Sung Jun Kang, MokPo National Univ., Myung-Ok Lee, Dongshin Univ, Korea
F2.6 Analysis of the Pathloss Characteristics with Variation of Refractivity Gradient
Using the Parabolic Equation
Jongho Kim, Yang-Su Kim, Joo-Hwan Lee, Yong-Seok Choi, ETRI, Korea
F2.7 A Parallel Acquisition Scheme for DS-SS Systems Using Antenna Arrays in a
Uncorrelated Rayleigh Fading Channel
Won Hyung Ryu, Seong Keun Oh, Jong Sung Hong, Hyundai, korea
F2.8 World-length Effect of Weight and Input Snapshot Vectors on MMSE/DD
Space-Time Array Receiver Performance
Jun Hwan Lee, Hyun Seo Oh, Mun Geon Kyeong, ETRI, Korea
F2.9 Peak to Average Power Ratio Reduction for Multi-Code CDMA Systems
Tae-Young Chang, In-Mum Chang, Yong-Suk Kim, Kyun-Hyon Tchah, Korea Univ.,
Yeon-Su Kim, Korea Telecom, Korea
F2.10 A New Digitally Implementable Feedforward Timing Estimator
Yun Seok Choi, Ji Hoon Cho, Su Hwan Choi, Kyun Hyon Tchah, Korea Univ.,
Joon-Ho Lee, Korea Telecom, Korea
F2.11 A Study on Hybrid-Rate Multiuser Detector for DS/CDMA Systems
Dae-Ho Woo, Jong-Yeop Yoo, Seung-Ho Lee, Byung-Kun Chang, Youn-Shik Byun,
Univ. of Inchon, Korea
F2.12 Interference Cancellation in Multi-rate DS-CDMA Systems
Nguyen Hoai Nam, Tran Hong Quan, PTIT, Vietnam, Sung-Moon Shin, ETRI, Korea
Day 3: November 24 (Friday)
Poster Session F3 : CDMA Network I
F3.1 The Implementation and Evaluation of Radio Link Protocol: On the W-CDMA
Radio Bearer Performance Aspects.
Gunhwan Kim, Junshick Chol, Jangsup Shim, Dacom R&D Center, Korea
F3.2 Paging Strategy Based on the Sign-On Lists of Base Stations in Cellular
- 30 -
Mobile Networks
Bongsue Suh, Song-In Choi, ETRI, Jin-Seek Choi, Kong-Ju National Univ., Korea
F3.3 Dynamic Dual Mode Packet Transmission in IMT-2000
Tae-Won Ban, Jan g-Wook Kim, Korea Telecom M. com, Korea
F3.4 Link Budget Analysis for W-CDMA IMT-2000 System
Dongkun Kim, Byungjun Park, Namwuk Lee, Sungmoon Shin, ETRI, Korea
F3.5 Novel Call Control Scheme for Voice/Data Service in CDMA Cellular Systems
Eun-Seon Cho, Cheol-Hye Cho, ETRI, Go-Whan Jin, Spreadtelecom, Korea
F3.6 A Evolutionary Scenario of Asynchronous IMT-2000 Network
Jaehoon Nah, Won Ok Ryoo, Kee Sung Cho, Jeahoon Yu, Yoonju Lee, Kyung-Pyo
Jun, ETRI, Korea
F3.7 Ethernet-ATM Test Bed Using IPOA on Linux for GGSN Interworking with
SGSN and Internet
Jeong-Hyun Park, Yeong-Jin Kim, Yoon-Ju Lee, ETRI, Korea
F3.8 Mobile IP Mobility Support in UMTS/GPRS
Jeonglak Ha, JeeHyeon Na, Eun-Hee Hyun, ETRI, Korea
F3.9 A Handshake Protocol Analysis of WAP WTLS
Jongcheol Moon, Bongwhan Kim, Sokjoon Lee, Yoojae Won, ETRI, Korea
F3.10 Design and Implementation of Functions of the Mobile IP Mobile Node for a
Mobile Packet Data Service in the IMT-2000 Mobile Communication Systems
Jungsook Bae, Jin Up Kim, ETRI, Korea
F3.11 Implementation of Interworking Function Protocols for IMT-2000
Kyung-Sik Kim, Sang-Ho Choi, ETRI, Korea
F3.12 An Efficient Billing Method for GGSN in GPRS Networks
Mi-Hee Kim, Young-Jin Kim, ETRI, Korea
- 31 -
Poster Session F4 : CDMA Network
F4.1 An Enhanced Mechanism of Network-initiated Packet Forwarding for UMTS
GPRS Network
S. Que Lee, Yeong Jin Kim, Sun Bae Lim, ETRI, Korea
F4.2 Design and Implementation of Control Protocol for 3G-324M Terminal
Taeil Jeong, Bonsue Suh, Yong-Seok Kim, Myung-Don Kim, Song-In Choi ETRI,
Korea
F4.3 Design of Multiplexing Protocol for IMT-2000 User Equipments and Its
Verification System
Bongsue Suh, Taeil Jung, Myungdon Kim, Yongsoek Kim, Song-In Choi, ETRI, Korea
F4.4 Analysis on Throughput of Access Channel in 2G CDMA Network
Min-kon Kwag, Hyung-sup Kim, In-cheol Shin, Hyundai, Korea
F4.5 Functional Implementation of Video Telephony Service Module for IMT-2000
UE Test-bed
Myungdon Kim, Yong-soek kim, Taeil Jeong, Bongsue Suh, Song-In Choi ETRI,
Korea
F4.6 The Effect of Soft Handoff on DS-CDMA Cellular Systems
Moo-Ho Cho, Kyong-ju Univ., Kwang-Sik Kim, DXO Telecom, Jae-Kyung Lee,
Dae-Sik Kim, ETRI, Korea
F4.7 Proposal of Fiber-Optic Asynchronous Subscriber Access Scheme for
ATM-based PON Using Optical CDMA Method
Sangjo Park, Seowon Univ., Yutae Lee, PhilJoo Moon, ETRI, Korea
F4.8 Performance Evaluation of a Synchronous COMA System in Multiuser
Environment
Byeong-Gwon Kang, Sun-Hyung Kim, Jin-Hong Park, Sun g-Jin Kang,
Soonchunhyang Univ., Korea
F4.9 Design of New Channel Coding Method, MLC Codes, for Next Generation
Wireless Communication Systems
Hyung-Yun Kong, Chang-Hee Lee, Univ. of Ulsan, Korea
F4.10 Real-time Implementation of AMR Speech Coder Using Teak-Lite DSP Core
Byungsik Yoon, Hyungjung Kim, Manho Park, Songin Choi, ETRI, Korea
F4.11 Design of a VAD Algorithm for Variable Rate Coder in COMA Mobile
Communication Systems
Jaewon Kim, Kyong-ju Univ., Hyungjung Kim, ETRI, Korea
F4.12 Traffic Control Schemes for Multimedia Services in Cellular System
Sunggu Choi Dongcheul Son, ETRI, Jaewon Kim, Sookun Kwon, Kyongju Univ.,
Yonggap You, Chungbuk National Univ., Korea
- 32 -
Session A1 : CDMA System
(09:00 - 10:40, Friday, November 24, 2000)
A1.1 Joint Space Time Adaptive Processing and Multi-User Detection for Reverse
Link IS-95 CDMA Reception with Experimental Results (Invited)
Joseph C. Liberti, Shimon Moshavi, Telcordia Technologies, USA
A1.2 Vestigial Sideband Wideband CDMA for Overlay System and its Implementation
(Invited)
Dong Ku Kim, Young-Kwan Choi, Sung Woo Kwon, Moon Ki Lee, Yonsei Univ.,
Dong Wook Roh, LGIC, Korea
A1.3 Study of a MFSK/FH-SSMA Wireless System with Double-Media Services
Wing C.Kwong, Hofstra Univ., USA, Guu-Chang Yang, Shang-Yao Lin, National
Chung-Hsing Univ., Taiwan
A1.4 Design and Evaluation of an All-Digital Multi-Rate BPSK Direct-Sequence
Spread-Spectrum Baseband transceiver Architecture for Indoor Applications
P. Melet, L. Andrieux, S. Bourdel, F. Campo, ICARE Research group, LAAS, A.
Cazarre, CNRS, LAAS, France
A1.5 Software Radios with Flexible Channel Coding for a Perfect Power Controlled
DS/CDMA System in an AWGN Channel
M. Sridharan, Indian Institute of Technology, D. Rajaveerappa, Cochin Univ., India
- 33 -
JOINT SPACE TIME ADAPTIVE PROCESSING AND
MULTI-USER DETECTION FOR REVERSE LINK IS-95
CDMA RECEPTION WITH EXPERIMENTAL RESULTS
Joseph C. Liberti and Shimon Moshavi
Telcordia Technologies
331 Newman Springs Rd. Red Bank, NJ 0770 1-5699
E-mail: [email protected]
Abstract
In this paper, we present novel approaches to reverse link signal reception in IS-95
CDMA systems using Space Time Adaptive Processing (STAP), Multi-User
Detection (MUD). and combined STAP/MUD techniques to implement receivers that
are resistant to the Near-Far problem. We also present experimental results that
were obtained by applying STAP, MUD, and combined STAP/MUD techniques to
signals collected over-the-air. The focus of the experiment is on applications
where power control is not available to the receiver, which results in a severe
Near-Far problem. Specific attention is given to techniques required to use methods
in real-world channels.
. INTRODUCTIONⅠ
In the conventional CDMA base station receiver, the receiver for each user is
implemented independently of the other co-band Mobile Stations, which are treated
as noise sources. By design, CDMA systems are tolerant of interference from other
co-channel users, called Multiple Access Interference (MAI); however, there are
limits to the ability of a CDMA base station receiver to handle high levels of MAI.
In order to control MAI, CDMA systems use fast power control to ensure that each
Mobile Station transmits the minimum amount of power necessary to achieve a
desired link quality.
The focus of this work is on applications where power control is not available to
the receiver. Desired signals may be far below the level of received Multiple
Access Interference (MAI). There is a range of applications where it would be
useful to augment the IS-95 infrastructure with receivers that are not the target of
reverse link power control. Examples include auxiliary receivers for geolocation,
and receivers used to monitor the performance of wireless networks. In these
- 34 -
examples, the CDMA receiver must contend with a severe Near-Far problem,
where the signal of interest may be 30 dB or more lower than the other
co-channel CDMA signals. The conventional IS-95 receiver is not able to tolerate
such a wide range of received power levels. However, by augmenting the
conventional base station with Space-Time Adaptive Processing, along with
Multi-User Detection techniques, we are able to implement a versatile and robust
receiver that can be used for a variety of signal monitoring applications.
Using array processing for the IS-95 reverse link, it is possible to spatially filter
received signals to emphasize desired components, while minimizing the effects of
noise and interference. This smart antenna technology can extend the reach of base
stations, provide near-far resistance, and exploit multipath that may not be
temporally resolvable. STAP receivers combine spatial processing and temporal
processing by using a tapped delay line for each antenna. Compared with a
I-dimensional array receiver, the STAP receiver allows the array to be more
effective in the presence of wide band signals, exploit temporally dispersed
multipath, and better reject a larger number of interfering signals.
In Multi-User Detection, code, timing, and possibly channel information of multiple
users are jointly used to better detect each signal. Thus each receiver sees less
MAI and receiver performance for each user is improved [3]. In this paper we
consider interference cancellation techniques, where interfering signals are
estimated, reconstructed, and canceled from the received signal. Here, we focus on
Successive Interference Cancellation (SIC), where signals are detected one at a
time, in order of signal strength. At each stage, higher-level interfering signals are
canceled.
Because of the wide range of received power levels for the application considered
in this paper, resulting from a lack of power control, the accuracy of signal
reconstruction and cancellation is of paramount concern. For example, if an
interfering signal is 30 above a desired signal, and it is cancelled so that 90% of㏈
the signal's power is removed, then the resulting residual is still 20 above the㏈
desired signal, which will prevent reception of the lower level signal. Therefore, we
have investigated techniques to substantially improve the performance of signal
reconstruction, including both symbol detection accuracy and channel estimation
fidelity. In this paper we explore the use of adaptive MMSE channel estimation
techniques in conjunction with SIC detection, including a Multi-Frequency channel
estimation approach. These techniques result in adaptive filters that serve to
recreate both the temporal structure of the channel, as well as the
frequency-spread characteristics of the signal components. Using these approaches,
in some cases it is possible to provide over 20 of interference rejection using㏈
over-the-air signals in complex multipath environments. In addition, these
techniques are even more powerful when combined with Space-Time Adaptive
Processing.
- 35 -
. SYSTEM MODEL AND CONVENTIONAL DETECTIONⅡ
The transmitted reverse link IS-95 signal for user k can be written in complex
baseband notation as
where βk is the transmitted amplitude of the kth user; Wk(t) is the transmitted
modulation symbol stream made up of 64-ary Walsh symbols of duration Ts[4]; pi(t)
and Pq(t) are the I and Q components, respectively, of the IS-95 short PN code
waveform; and Pl.,k(t) is the IS-95 long code waveform for the kth user1). Given K
users in the system, the received signal can be written as
where αk,i and τk,i are the complex channel gain and time delay of the ith multipath
component for the kth user, and n(t) is zero mean complex additive white Gaussian
noise.
The conventional IS-95 reverse link receiver for the K users consists of a bank of
matched filters, as shown in Fig I. After dispreading, H indicates a bank of 64
matched filters, one for each possible Walsh symbol, which can be implemented as
a Walsh-Hadamard transform. Fig. I only shows a single Rake finger per user;
however the base station receiver exploits multipath diversity by combining the
outputs of multiple Rake fingers.
1) The same underlying long code of length 242 -1 chips is used for all users in an IS-95
system, but with a unique time shift [4].
- 36 -
Fig. 1. IS-95 Reverse Link transmitters and a conventional base station receiver for
K users.
. SUCCESSIVE INTERFERENCE CANCELLATION(SIC)Ⅲ
Unlike the conventional detection shown in Fig. 1, which does not utilize
information about other users when detecting any single user, in Successive
Interference Cancellation (SIC) Multi-User Detection (e.g. [1],[6]), each user is
detected, reconstructed, and canceled, in order of signal strength, so that the
remaining users see less MAI. The advantage of detecting and canceling users in
the order of signal strength is that it is easiest to acquire, detect, and reconstruct
the strongest users accurately. Also, canceling the strongest users provides the
largest benefit for the remaining users. As a result of this approach, the strongest
user will not benefit from any MAT reduction; the weakest users, however, will
potentially see a large reduction in their MAI.
The performance of SIC detection depends on the accuracy of the channel
estimation. A common approach to channel estimation is to average the output of
the correlator over several symbols One disadvantage of this approach is that it
requires us to acquire, track, despread, and reconstruct each multipath component
separately.
- 37 -
Fig. 2: The SIC JMMSE Receiver-stage j
In this paper we use adaptive MMSE channel estimation techniques to reconstruct
the channel. In other words, we solve for the adaptive filter tap weights that
minimize the mean square error between the received signal and the output of the
adaptive filter, where the input to the filter is an estimate of user k's respread
waveform, s k(t). The filter, which we refer to as the Adaptive Reconstruction
Filter (ARF), is implemented using a tapped delay line. In order to accommodate
frequency tracking errors, and account for frequency spreading, which can occur
due to Doppler shift in the channel, we may also augment the reconstruction filter
with multiple frequency reconstruction. The combination of successive interference
cancellation and the ARF channel estimator is referred to in this paper as the
SIC-MMSE Receiver. When multiple frequencies are used in the channel
reconstruction, the ARF is called a Multi-Frequency MMSE, (MF-MMSE) channel
estimator. A general form of the ARF is illustrated in Fig. 2 for stage j of the SIC
receiver.
- 38 -
In stage j of the receiver we assume that we already have estimates for the
transmitted symbols for the j-1 users whose signal strengths are higher than that
of user j. Each of these symbol streams are remodulated and respread using the
long and short codes. At each stage, j, the channels for the j-1 previously
demodulated signals are jointly re-estimated, along with frequency spreading, in
order to closely match it to the corresponding Multiple Access Interference
component in r(t). Thus, the symbols of one additional user are detected in each
stage, but the spectral-temporal signal structure of all previously detected users
are reestimated and cancelled anew at each stage. This approach is called the Joint
MMSE(JMMSE) ARF.
Let s k,p,n be a row vector containing the Q samples of the reconstructed signal for
user k, from time nTs to (n + Q - I)Ts, and frequency shifted by (p - P/2)/(QTs)
Hz:
Let rl be a row vector containing the Q samples of the received signal, r(nTs)
through r((n + Q - 1)Ts). Then at stage j, the cleaned signal is:
where
- 39 -
The goal is to find the weight vector w that minimizes the cost function:
where gives:
Let us consider two special cases. In the case where Q is large enough (possibly
many times the number of samples per symbol) so that the user codes can be
considered approximately orthogonal (also considering the cross correlations over
the N delays, and M frequency shifts), the spatial weight vector can be obtained
independently for for interferer, i and frequency offset, p:
Using the Multi-Frequency MMSE approach is particularly useful for the case
described above, where Q is very large, because the frequency spread of the signal
may be large relative to 1/(QTs).
Another special case is when only a single cancellation frequency is used (i.e. no
frequency re-spreading), so that:
This results in the single-frequency SIC-JMMSE receiver. This case can be very
useful on short segments of data, where Q is small and the frequency spread of
signal components is likely to be small relative to 1/(QTs)
- 40 -
The use of the ARE for signal reconstruction permits very accurate channel
estimation and signal cancellation which is crucial for applications were there is a
wide range in received power. Here small inaccuracies in channel estimation may
lead to significant post-cancellation residual interference for the weaker desired
signals. The ARF also provides significant additional advantages: (1) Individual
multipath components do not need to be tracked and separately estimated; the ARF
recreates the multipath channel structure, with accurate amplitude and phase
estimates for each component. The length of the ARF tapped delay lines should be
long enough to accommodate the delay spread of the channel. (2) Cancellation
residuals are minimized according to the MMSE criterion. (3) Cancellation timing
errors are mitigated, since the filter weights do not need to be exactly centered
around the main multipath peak in order to solve for them accurately. (4) The
actual waveform shape is recreated, including the effect of the transmit filter.
A more conventional approach to Successive Interference Cancellation is to only
estimate the channel for signal j-1 at stage j, rather than all j-1 previously
demodulated signals. This approach can also benefit from the MF-MMSE channel
estimation. In general the SIC-JMMSE approach works better than the SIC-MMSE
approach, particularly on short segments of data, where the cross-correlations
between signal components will be higher.
. SPACE-TIME ADAPTIVE PROCESSINGⅣ
When several antenna elements are available at the receiver, we can exploit array
processing to enhance signal reception. Fig. 3 illustrates Space-Time Adaptive
Processing (STAP) for IS-95 CDMA. In this receiver, the weights form a
spatio-temporal solution for user k that enhances the desired signal component, and
minimizes the impact of noise and interference.
A key complication in applying STAP to the IS-95 reverse link is that there is no
pilot present in the received signal. One approach to estimating the STAP weights
when no pilot is present is to hypothesize each of the 64 possible symbols that
might be sent during any particular symbol period, and use each of these symbols
values to adapt a set of STAP weights. Each of these 64 STAP solutions, when
applied to the received data during a particular symbol period results in a set of
Walsh matched filter bank outputs, {hi}. The hypothesized value that results in the
best peak-to-average ratio for {hi} is chosen as the transmitted symbol. Other
approaches based on multiple symbols have also been applied, e.g. by feeding back
previously demodulated symbols. These techniques provide improvements over the
single-symbol case, particularly for low Signal-to-Interference Ratios.
- 41 -
Fig. 3. A single-user Space-Time Adaptive Processing
(STAP) receiver for the IS-95 reverse link.
If Cl represents the collection of sampled data on each of the array elements, each
employing a J-element tapped delay line, at time l, (MJ rows by Q samples), then
the STAP solution for hypothesized symbol i is the length MJ weight vector that
minimizes the cost function
or
where s ( i)k.l is the row vector containing Q samples of the reconstructed waveform
for user k, at time l, using hypothesized symbol i. The data vectors are stacked
versions of the received data row vector for each of the M antenna elements, and
J time taps.
V. COMBINED STAP/MUD RECEIVERS
- 42 -
While single-user STAP and Multi-User Detection are powerful techniques
individually, our research results have demonstrated the additional advantages of
combining these techniques together. Some approaches that combine MUD and
antenna arrays are discussed in [1],[8],[9]. In this paper we apply SIC to each
antenna element, and then apply STAP to the cleaned versions of the received
signals from each antenna element.
Another approach to combining STAP with the concept of interference cancellation
is to jointly solve for the reconstruction filter tap weights and the STAP weights. In
other words, the solution for hypothesized symbol i is the length MJPNj weight
vector that minimizes the cost function
or
where U l = [ CTl B
Tl ]T. This approach did not perform as well as the approach
of Fig. 4 for very low SINR because of the lack of pilot symbols i.e., the need for
blind adaptation; the added degrees of freedom made it more difficult to distinguish
between hypothesized symbol outputs.
Fig. 4. One approach to combined STAP+SIC receiver.
VI. RESULTS AND CONCLUSIONS
- 43 -
In the example shown in Fig. 5, data was collected using a compact 8-element
array mounted on the platform illustrated in the photograph. The IS-95 signals are
not power controlled to the array receiver, so the SINR for these Mobile Stations
ranges from +5.7 to -38.8 . The challenge of this experiment is to extract all㏈ ㏈
of the incident signals without errors.
As shown in Fig. 5, a wide range of techniques were applied, including the
conventional Rake receiver, multi-antenna diversity combining, SIC, STAP, and
combined SIC + STAP approaches. Techniques were applied using a varying
number of antenna elements, M, and temporal taps, N. Fairly promising results were
obtained by applying SIC and STAP individually; however, it is only by combining
SIC and STAP that we receive all signals with no-errors. The plot shows the raw
Symbol Error Rate before the IS-95 convolutional decoder. The lack of smoothness
and non-monotonic nature of some of the curves arise from the small over-the-air
data set used to develop this example.
The results presented in this paper show the power of using combined STAP and
MUD techniques to implement auxiliary receivers that are not the target of reverse
link power control. Using these techniques, in the example above, we have shown
that it is possible to extract signals with SINRs as low as -38.8 .㏈
These techniques open up the potential for powerful auxiliary receivers for IS-95
systems. These auxiliary receivers can be used to monitor the wireless system or
provide geolocation information. Furthermore, these techniques can potentially be
used to substantially improve the reverse link performance of IS-95 systems, as
well as emerging Third Generation CDMA technologies.
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- 44 -
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- 45 -
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Fig. 5. Results of applying a variety of algorithms to over-the-air, non-power
controlled IS-95 signals in an urban setting with 8 sources. The number of
antenna elements used for each approach is M, and the number of temporal tapsis N. The "Combined STAP + SIC" approach resulted in zero errors for each ofthe eight Mobile Stations.
