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MSc Project List for 2004/5 from Prof. Barry G [email protected]
No Project Title RA co-supervision
Rm No. Email
1 Robust mobile satellite systems physical link (ACM & ARQ) design and performance evaluation
K.Narenthiran U40 [email protected]
2 OFDM performance on mobile broadcast/multicast S-DMB channel
K.Narenthiran U40 [email protected]
3 Performance evaluation of satellite based aeronautical communication system
K.Narenthiran U40 [email protected]
4 Evaluation of multiparty conferencing in satellite-UMTS Victor Kueh U6 [email protected]
5 Investigation of packet scheduling schemes for satellite digital multimedia broadcast
Victor Kueh U6 [email protected]
6 Open loop Tx diversity schemes for more than 2 antennas for UMTS downlink
Atta Quddus U42 [email protected]
7 Multipath and common channel interference cancellation in UMTS downlink
Atta Quddus U42 [email protected]
8 Body Area Networks Barry Evans E18 [email protected] SDMB-RAKE Receivers Atta Quddus U42 [email protected]
10 Low Density Parity Check Codes Stelios Papaharalabos
11 Investigation of the impact of Carousel-FEC in satellite digital multimedia broadcast systems
Linghang Fan U6 [email protected]
12 Simulation tool for broadband satellite transponder capacity modelling
Paul Thompson E11 [email protected]
IMR replica
Direct satellite
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No.1: Robust mobile satellite systems physical link (ACM & ARQ) design and performance evaluation
No.1: Robust mobile satellite systems physical link (ACM & ARQ) design and performance evaluation
Objective:
• To evaluate the performance of the ACM & ARQ techniques under satellite propagation environment.
Software tool:
• C/C+
Basic requirements from students:
• Basic knowledge in coding and modulation in wireless NW (mod. and coding module)
• Retransmission techniques (ACK-based-ARQ, NACK-based, Hybrid)
• Basic knowledge in satellite channel propagation aspects (Mobile and SAT coms. modules)
• Reasonable programming skills in C/C++
Main tasks:
• Understanding the concept of ACM & ARQ and its importance in 3G packet data transfer
• Understanding the satellite channel propagation aspects and the channel simulation models
• Understand the the available link level simulator, modify according to different ACM & ARQ schemes and evaluate the performance under different satellite channel conditions
No.2: OFDM performance on mobile broadcast/multicast S-DMB channel
Objective:
• Investigating the performance of the OFDM in S-DMB environment (Sat+IMR) and comparison with WCDMA to see the capacity enhancement (Specifically impact of the guard time and the payload non-linearity).
Software tool:
• C/C+
Basic requirements from students:
• Basic knowledge in coding and modulation in wireless NW (mod. and coding module)
• Basic knowledge in satellite channel propagation aspects (Mobile and SAT coms. modules)
• Reasonable programming skills in C/C++
Main tasks:
• Understanding the concept of OFDM and its features particularly in high data rate wireless NW.
• Understanding the IMR channel propagation aspects and the channel simulation models
• Integrate the coding module to the available OFDM link level simulator and evaluate the performance
• Modify the available OFDM Link level simulator accommodate different guard interval and evaluate the performance
No.3: Performance evaluation of satellite based aeronautical communication
Simulation Start (GUI optional)
1. SituateSatellites
2. DefineBeams
3. TraceAircrafts
4. DefineActive Set
8. MeasureDistances
between A/Cand S/L
9. Define FSLand other
losses
10. Add fastfading
11. Link GainMatrix
12. Handover
Select initialtransmit
Power ControlStabilisation
TransmitSignal
CalculateReceived
Signal
SendCommand
Compare SIRwith Target
14. Power Control
15. Calculate QoSmeasures
SIR balancing loop
Main Simulator loop
16. Apply MobilityModel
5. TrafficGeneration
13. Error Detection
6. Scheduling 7. Channel Effect
No.3: Performance evaluation of satellite based aeronautical communication
No.3: Performance evaluation of satellite based aeronautical communication
Objective:
• Capacity dimensioning and system level performance evaluation of aeronautical system
Software tool:
• C/C++ and MATLAB
Basic requirements from students:
• Knowledge about different satellite and terrestrial mobile communications systems and their services
• Overall understanding on satellite and terrestrial system architectures and their components
• General idea about radio resource management and telecommunication traffic aspects
• Reasonable programming skill in C/C++ and MATLAB
Main tasks:
• Understand the aeronautical communication and related issues
• Understand the radio resource management issues related to CDMA system
• Understand the traffic and mobility modeling
• Understanding system level simulation model and its individual modules.
• Derive reasonable traffic modeling for the aeronautical communication systems and evaluate the performance to see how many number of air-craft can be supported with the required QoS
MSc Project Time Plan
No.4: Evaluation of Multiparty Conferencing over Satellite UMTS
– Literature survey of previous work on multiparty conferencing within UMTS and satellite framework
– Investigate the effect of the different Radio Link Control (RLC)/ Medium Access Control (MAC) parameters on the conference signalling performance (to be implemented on the existing ns-2 simulator)
– Perform evaluation over S-UMTS radio interface for different scenarios/configurations (for e.g. user calling into a conference, user getting invited into a conference)
Objectives
Motivation
– UMTS to deliver multimedia sessions including multiparty conferencing based on the Session Initiation Protocol (SIP) – S-UMTS a promising alternative for the provision of these types of services
– Have some background on§ IP & Internetworking - Session Initiation Protocol (SIP)§ Mobile Communications (UMTS and satellite)
– Programming knowledge § C ++ (compulsory) and ns2 (preferably)
Requirement
No.4: Evaluation of Multiparty Conferencing over Satellite UMTS
No.5: Investigation of Packet Scheduling Schemes for Satellite Digital Multimedia Broadcast
– Literature review of existing work on packet scheduling within the W-CDMA UMTS context
– Investigating methods for the Transport Format Combination Set (TFCS) derivation
– Design efficient packet scheduling scheme(s) considering availability of channel state information (CSI)
– Perform comparison with scheme(s) without CSI
Objectives
Motivation– Delivery of multimedia broadcast and multicast services to mobile
users via satellite has become a major research/business topic in recent years
– Packet scheduling plays an important role as part of the radio resource management strategy to satisfy the QoS requirements of different multiplexed services
– Have good background on§ Mobile Communications (UMTS and satellite)§ Mathematics
– Programming knowledge § C ++ (compulsory) and ns2 (preferably)
Requirement
No.5: Investigation of Packet Scheduling Schemes for Satellite Digital Multimedia Broadcast
LogicalChannels
MAC
TransportChannels
PHY
PhysicalChannels
MTCH MCCHLogical
Channels
MAC
TransportChannels
PHY
PhysicalChannels
MTCH 2
S -CCPCHS -CCPCH 1
MCCHMTCHMTCH 1 MTCHMTCH 3 MTCHMTCH 4 MTCHMTCH 5
S -CCPCHS -CCPCH 2
FACH 1 FACH 2 FACH 3
MBMS service 1
MBMS service 2
MBMS service 3
MBMS service 4
MBMS service 5
Logical channel multiplexing Logical channel multiplexing
Transport channel multiplexing
3G Mobile Network
3G Basestation
Content providers
Hub basedon 3G equipment
ContentNetwork
3G handset
Interactive link in IMT2000 mobile terrestrial band
MBMS Broadcast/Multicast Service Centre
Satellite dis tribution link in IMT2000 mobile satellite band
Local storage
+
3G Air interface
Terrestrial Repeater for dense urban area coverage
No.5: Investigation of Packet Scheduling Schemes for Satellite Digital Multimedia Broadcast
No.6: Open loop Tx diversity schemes for more than 2 antennas for UMTS downlink
S1 S2STTD encoder
S1 S2
-S2* S1
*
T 2T0 T 2T
Ant 1
Ant 2
MobileAntenna
Path 1
Path j
Ndata
Introduction: Transmit Diversity is one of the key contributing technologies in WCDMA 3G systems in which space time codes are used to introduce joint correlation in both space and time domains. In the current 3GPP standard, diversity schemes for 2 Tx. Antennas have been defined. It is being discussed at the moment to increase the number of Transmit Antenna from 2 to 4, targeting Release 6 and various possible diversity schemes are being investigated.
Requirements:Knowledge of C++, Matlab, Signal Processing
No.6: Open loop Tx diversity schemes for more than 2 antennas for UMTS downlink
Objective of the Project: The objective is to understand, implement and verify the open loop transmit diversity schemes for 2 antennas, first and then investigate the possible schemes for 4 antennas.
Issues:
• Backward Compatibility
• Performance
• Complexity
No.7: Multipath and Common Channel Interference Cancellation in UMTS Downlink:
Introduction: Due to multipath propagation, the orthogonality of the spreading codes is destroyed to some extent even though perfectly orthogonal codes are used in UMTS downlink. Thus the performance of a Rake receiver suffers due to inter-path interference. One approach is to cancel this interference in a parallel multi-stage manner.
Requirements:Knowledge of Matlab, Channel Modelling, UMTS
Objective of the Project: The objective is to understand and implement various multipath interference cancellation techniques in a simplified UMTS link level simulator.
Issues:
• Interf. generation after Rake combining vs. after channel decoding
• Multicode Transmission
• S-DMB Environment with lots of multipaths
No.7: Multipath and Common Channel Interference Cancellation in UMTS Downlink:
No.8: Body area networks
No.9: S-DMB Rake Receiver Architectures
Introduction: Due to multipath propagation, the orthogonality of the spreading codes is destroyed to some extent even though perfectly orthogonal codes are used in UMTS downlink. Thus the performance of a Rake receiver suffers due to inter-path interference.
No.9: S-DMB Rake Receiver Architectures
Requirements:Knowledge of Matlab, Digital Communications
Objective of the Project: The objective is to understand and implement a generalized Rake receiver (G-Rake) for multipathinterference suppression in S-DMB multipath environment.
Issues:
• Pulse shape filtering and over-sampling
• Finger placement
• Appropriate Weights
Background
• LDPC codes are block codes – Proposed by Gallager in 1962– Rediscovered by MacKay and Neal in 1996
• Very sparse parity check matrix• Iterative decoding by the sum-product algorithm• Achieve near Shannon limit performance
– large block sizes, Binary Symmetric, Binary Erasure and AWGN channel
• Recently adopted by the DVB-S2 standard (2004)• Current work in 3GPP MBMS R6 (Packet Level FEC)
No.10: LDPC codes
Projects Description and Basic Requirements
Project 1• Digital Modulation
and Coding for DVB-S2 Standard
Project 2• Efficient Coding
and Decoding for LDPC Codes
• Knowledge of digital communications theory (encoding/decoding techniques, turbo codes)
• Block codes, iterative decoding, log-likelihood algebra
• Good C programming skills
No.10: LDPC codes
Project 1 Objectives
• Digital Modulation Schemes (QPSK, 8-PSK, 16 and 32-APSK)• Non-linear HPA effects (back-off, predistorsion techniques)• Implementation of LDPC + BCH encoder for very low BER• Sum-product algorithm decoding
No.10: LDPC codes
Project 2 Objectives
• Random parity check matrix generation (MacKay codes, irregular LDPC codes)
• Linear-time encoding (array codes, finite geometry codes)• Sum-product/min-sum algorithm decoding• Efficient decoding implementations
– Reduced complexity algorithms, serial/parallel architectures, high speed decoding
Projects Interaction and Integration
Project 1DVB-S2 LDPC encoder Project 2
Low complexitydecoding algorithms
Low complexity decoding algorithms suitable for DVB-S2 LDPC codes
Sum-product algorithm
No.10: LDPC codes
References
• W. E. Ryan, “An introduction to LDPC codes”, CRC Handbook for Coding and Signal Processing for Recording Systems
• W. E. Ryan, “Concatenated codes and iterative decoding”, Wiley Encyclopaedia of Telecommunications
• A. Shokrollahi, “An introduction to LDPC codes”, Digital Fountain Inc., White Paper
• X.-H. Hu et al, “Efficient implementations of the sum-product algorithm for decoding LDPC codes”, IEEE Globecom 2001 (IBM Research, Zurich)
No.10: LDPC codes
Research Problem
• One of the key parameters in data carousel is “response time”• The lower bound for “response time” has been studied, and the impact
of transmission errors is on this lower bound is also assessed. • However, the analysis and simulations do not take packet-level FEC
into account. FEC can bring down the “response time” in the presence of errors.
No.11: Investigation of the impact of Carousel-FEC in Satellite Digital Multimedia Broadcast Systems
Objectives
• The trade-off performance between the reduced “response time” in the presence of errors and the increase in size of items when FEC is applied.
• The right balance has to be found between the original packets and parity packets according to different reception scenarios.
No.11: Investigation of the impact of Carousel-FEC in Satellite Digital Multimedia Broadcast Systems
Oct 2004 MSc Project P T Thompson 28
OBJECTIVE:
• To develop a simulator that can assess the capacity of a geostationary satellite transponder when loaded with a mix of broadband traffic having varying QoS and delay parameters.
BACKGROUND
• The projected average session rates for the broadband traffic mix will be provided for a range of years into the future. Typical satellite and earth station data will also be provided.
• The modelling should be conducted on a session basis using a software language chosen by the student.
No.12: Simulation tool for broadband satellite transponder capacity modelling
• ITU G1010 performance targets (delay and packet loss ratio) should be used in the simulation.
• The student will need to develop a suitable method of presenting the simulation results in a meaningful manner.
• A generic simulation tool should be developed (most likely based on queuing theory and suitable statistical models of the traffic flow).
Contact details:Dr Paul Thompson, E11 BA Tel extn 6019e-mail [email protected]
No.12: Simulation tool for broadband satellite transponder capacity modelling
