Smart Antennas and Transmit Diversity for GSM Systems 指導教授：黃文傑博士學生：曾凱霖學號： M9121014 無線通訊實驗室.

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Smart Antennas and Transmit Diversity for GSM Systems 指導教授：黃文傑博士學生：曾凱霖學號： M 無線通訊實驗室

Outline 1 、 Introduction 2 、 System Architecture 3 、 Channel Model 4 、 Data Structure 5 、 GSM BER Performance 6 、 GSM Capacity 7 、 Summary

Introduction How to improve the GSM systems ？ → BS antenna arrays Beamforming 、 STBC Edge-Excited hexagonal cells

System Architecture

Channel Model Path loss 、 Shadowing 、 Fading Received signal Circular antenna array (L element)→ SDMA The gain for a circular antenna array We consider 2-D

Data Structure Received signal Attenuation of signal STC Matrix

GSM BER Performance Cell radius r=750m Path loss parameter n=3.5 Shadowing standard deviation Mobile Transmit & BS

GSM Capacity Outage Probability

Summary New structure for GSM provided improved performance with little increase in complexity. BER is lowed & capacity increased.