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  • 學位論文

渦輪碼編碼組合與多元化組合於慢速跳頻展頻通訊系統中的應用

Turbo Coded Combining Schemes for Slow FH/SSMA Communicational Systems

指導教授 : 劉玉蓀
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摘要


本論文考慮慢速跳頻展頻多重存取(slow Frequency Hopping Spread Spectrum Multiple Access, FH/SSMA)系統。SSMA可以讓一個以上的使用者同時使用同一頻寬來傳送資料,但是使用者之間的相互干擾會使發生傳送錯誤的機率隨著使用者數目增加而上升。一個解決此問題的方法為封包結合(packet combining),就是利用傳送失敗的舊封包內的資訊與新封包做編碼組合(code combining)或多元化組合(diversity combining)以提高封包傳送成功的機率,增加系統有效流量(throughput)。本論文的目的是利用渦輪碼編碼組合與多元化組合的方式提高跳頻系統的流量。在此系統中,訊號遭受Rayleigh fading、Multiple Access Interference及白色高斯雜訊的干擾。我們提出四種渦輪碼編碼組合與多元化組合的方式改善封包錯誤率,模擬結果顯示這四種封包結合的方式都可以提高封包傳送成功的機率,增加系統流量。

並列摘要


In this thesis, we propose four different turbo coded combining and diversity combining schemes for frequency-hopping spread spectrum multiple access (FH/SSMA) systems. These schemes use the information in the previously received packets to increase the probability of correct decoding for the latest packet. Based on simulation results, these combining schemes greatly improve the performance of FH/SSMA system.

並列關鍵字

FH/SSMA turbo code packet combining

參考文獻


[1] Roger L. Peterson, Roger E. Ziemer and David E. Borth, Introduction to Spread Spectrum Communications, Prentice Hall, 1995
[2] Theodore S. Rappaport, Wireless Communications Principle & Practice, Prentice Hall, 1996
[3] Raymond Steele, Mobile Radio Communication, IEEE, 1996
[4] J. D. Kim and S. W. Kim, “A Simple Packet Combining Technique in Frequency-Hopped Spread-Spectrum Multiple Access Communication Networks,” Proc. ICC’97, vol. 3, pp. 1207-1211, 1997
[5] J. D. Kim and S. W. Kim, “Logic AND Diversity Combining in FH/SSMA Packet Radio Network,” IEEE Communication Letters, vol. 3, no.1, pp. 1-3, Jan. 1999

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