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

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 、 FadingReceived signalCircular antenna array (L element)→ SDMAThe 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 dB7

GSM Capacity

Outage Probability

)Pr()Pr(00

0 SIN

EPBERP b

out

dBN

Eb 60

01.00 P

Summary

New structure for GSM provided improved performance with little increase in complexity.

BER is lowed & capacity increased.