Wireless Communications Principles and Practice

Chapter 1: Introduction to Wireless Communication Systems

Dr. Khairun Nidzam bin Ramli

ISBN: 0-13-042232-02Fig. 1.1IntroductionCommunicate move Guglielmo Marconi ships English channel 1897 Rapid growth digital & RF circuit miniaturizationRadio spectrum government technology development

Pg 13IntroductionHistorically, slow growth in mobile communication field 1934 police radio system AM mobile systemVehicle ignition noise1935 Edwin Amstrong FMWWII accelerates manufacturing + miniaturization1960 Bell laboratories developed cellular concept1960s mobile users were not connected to PSTN1970 development of highly reliable, miniature, solid-state RF hardware

Pg 24The electronics boom

Figure 1.1 The growth of mobile telephony as compared with other popular inventions of the 20th century.5Fig. 1.1 pg3

Pg5, N=1, RC f=825, FC f = 870. Thus 870-825=45 MHz.Total channel = 33 + 799 = 832Upper f lower f = 849 824 = 25 MHzCh BW = 25 MHz/832 = 30.0481 kHz6

Pg 7AMPS = Advanced Mobile Phone SystemNAMPS = Narrowband AMPSUSDC = US Digital CellularCDPD = Cellular Digital Packet DataIS-95 = Interim Standard 95GSC = Golay Sequential CodingPOCSAG = Post Office Code Standard Advisory GroupFLEX = 4 level-based paging standardDCS-1900 = Digital Communication System 1900 MHzGSM = Global System for Mobile CommunicationPACS = Personal Access Communication SystemMIRS = Motorola Integrated Radio SystemiDen = Integrated Digital Enhanced Network

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Pg 8ETACS = European Total Access Cellular SystemNMT-450 = Nordic Mobile TelephoneGSM = Global System for Mobile CommunicationERMES = European Radio Message SystemCT2 = Cordless TelephoneDECT = Digital European Cordless SystemDCS-1800 = Digital Communication System 1800 MHz

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Pg 8JTACS = Japanese Total Access Communication SystemPDC = Pacific Digital CellularNTT = Nippon Telephone & TelegraphNTACS = Narrowband Total Access Communication SystemNEC = NationalPHS = Personal Handyphone System

9Mobile a radio terminal that is attached to a high speed mobile platformPortable a radio terminal that can be hand-held and used by someone at walking speed

Example of Wireless Communication SystemPg 910

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Figure 1.6 Timing diagram illustrating how a call to a mobile user initiated by a landline subscriber is established.15Fig. 1.6 pg 16MIN = Mobile Number IdentificationESN = Electronic Serial NumberSCN = Station Class Mark

CCH are defined & standardized over the entire geographic area covered make up about 5% of the total number of channels in the system.The other 95% are dedicated to voice & data traffic

Figure 1.7 Timing diagram illustrating how a call initiated by a mobile is established.16Fig. 1.7

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Pg 39419Modern mobile system uses digital modulationVLSI & DSP made digital modulation cost effective than analogAdvantages of digital modulationNoise immunity & robustness to impairmentsEasier multiplexing (voice, data & video)SecurityError control codesSupport complex signal processing (source coding, encryption & equalization)Pg 27720

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