CS Part 3(1) 2001 - Mobile Communication Systems (GSM)

CS Part 3(1) 2001 - Mobile Communication Systems (GSM) -...

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E303 & ISE3.2E IMPERIAL COLLEGE of SCIENCE, TECHNOLOGY and MEDICINE, DEPARTMENT of ELECTRICAL and ELECTRONIC ENGINEERING. COMPACT LECTURE NOTES on COMMUNICATION THEORY. Prof Athanassios Manikas, version November 2001 Mobile Communication Systems -GSM- G S M roupe peciale obile Outline: ì Introductory concepts and GSM Properties ì GSM Source Encoder ì Channel Encoder & Interleaver ì GSM Mobile-to-Base Link ì GSM Hierarchy ì Gaussian MSK Modulation
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Principles of Communication Theory & Systems Compact Lecture Notes Mobile Communication Systems 2 A. Manikas  1. Multiple Access FDMA ì it is an technique ANALOQUE ì need of in time. no synchronization ì the transmission bandwidth is partitioned to frequency slots ì different users have different RF carrier frequencies, i.e. each user is assigned a particular frequency slot . ì users/signals are at the receiver by separated out FILTERING ì if all frequency slots are occupied then the system has reached its CAPACITY TDMA ì it is a technique DIGITAL ì requires between users synchronization ì each user/signal is assigned a particular (within a time-frame) time slot ì if all time slots are occupied then the system has reached its CAPACITY Principles of Communication Theory & Systems Compact Lecture Notes Mobile Communication Systems 3 A. Manikas
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Principles of Communication Theory & Systems Compact Lecture Notes Mobile Communication Systems 4 A. Manikas  2 Mobile Cellular Systems Þ ì A mobile cellular system consists of ˆ Base Stations (BS), or Base Transceiver Stations (BTS) ˆ cells (a cell is the area serviced by a base station) and ˆ mobiles (subscribers), or Mobile Stations (MS) When a call originates, the base station nagotiates with the mobile on various aspects (such as the channel used etc.), before establishing communications. After this, as the mobile moves from cell-to-cell, the service is handed ( ) from one base station to another. hand-off handover or Principles of Communication Theory & Systems Compact Lecture Notes Mobile Communication Systems 5 A. Manikas ì Only one base station will service a mobile at any one time. ì Note: ˆ base station to mobile is known as FORWARD LINK ˆ mobile to base station is known as REVERSE LINK
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Principles of Communication Theory & Systems Compact Lecture Notes Mobile Communication Systems 6 A. Manikas  ì Channel Reuse and Reuse Distance ˆ
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CS Part 3(1) 2001 - Mobile Communication Systems (GSM) -...

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