在多路徑衰減環境中細胞式TDMA行動通訊系統之性能分析

本篇論文是分析細胞式TDMA行動通訊系統在Nakagami多路徑衰減通道之上鏈路性能。在本文中我們將傳輸路徑損失指數設定為4，並且考慮區域分割天線、波束對應、零點對應、分集技術、細胞格式及通話活動監控對系統通訊性能的影響。調變技術主要是採用MSK調變技術，接收機則為同調接收機架構。論文內容包含多路徑衰減環境下 TDMA系統上鏈路之性能分析；使用方向性天線於基地台接收機之性能分析；以最大比結合作分集接收之性能分析；調變技術改採用GMSK 之性能分析；系統通道容量分析。分析結果顯示TDMA系統的性能會隨著路徑數目的增加而變差；在多路徑環境中使用方向性天線和最大比結合均可改善系統性能，且以零點對應之效果較佳；使用N=7之細胞格式所得到的性能優於N=3或N=4之細胞格式；採用MSK調變技術之錯誤率較GMSK調變技術為低。

關鍵字

TDMA ； MSK modulation ； sectorized antenna ； beam-steering ； null-steering ； probability of error ； channel capacity

並列摘要

The performance of reverse-link of a cellular TDMA mobile communication system over Nakagami frequency-selective fading channel is analyzed. A fourth-order propagation path loss is assumed. The sectorization, beam- steering, and null-steering are considered to combine with the receiver. The diversity combining technique, cellular pattern, and voice activity are also investigated. The MSK modulation and coherent receiver are used in the analysis. The average error probabilities and channel capacities of TDMA system with directional antenna for reverse link over Nakagami fading channel are derived. The BER of GMSK modulation in a Rayleigh fading environment is compared with that of MSK modulation. The numerical result shows that the performance of TDMA system is degraded with path number; the performance can be improved by using directional antenna and diversity technique; and the null-steering antenna can provide the best performance. The performance of cellular TDMA system with pattern N=7 is better than those of patterns N=3 and N=4. The bit error rate of MSK modulation is lower than that of GMSK modulation.

並列關鍵字

分時多重進階；最小頻率鍵移調變；區域分割天線；波數對應；零點對應；錯誤率；通道容量

參考文獻

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國際替代計量

在多路徑衰減環境中細胞式TDMA行動通訊系統之性能分析

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