探討各種多元化封包結合方法在慢速 跳頻展頻多工通訊系統的應用

Diversity Combining Schemes in SFH/SSMA Communication Systems

詹豐嘉(Feng-Chia Chan)

指導教授 ： 劉玉蓀

中原大學/工學院/電機工程研究所/碩士(2002年)

https://doi.org/10.6840/cycu200200238

摘要

本論文提出一個低複雜度的多元化組合﹙diversity combining﹚方法來提高慢速跳頻展頻多工﹙Slow Frequency-Hopped Spread-Spectrum Multiple Access, SFH/SSMA﹚通訊系統中封包傳送成功的機率。在系統中考慮多個傳送端同時經由Rayleigh衰減通道傳送跳頻展頻MFSK調變訊號，接收端使用非同步MFSK解調變器與門檻值測試的方式解調變，再由解調變後的輸出計算相對應的摺積碼解碼路徑的可信度值。最後將新舊封包中相對應的可信度值相加，以Viterbi摺積碼解碼演算法則進行解碼。由模擬的方式，探討這個低複雜度的多元化組合方法是否比現有使用RS碼解碼方式的多元化組合方法，還能大幅提升系統效能。

關鍵字

摺積碼 ； RS碼 ； 慢速跳頻展頻多工 ； 門檻值測試 ； 多元化組合 ； 非同步MFSK解調變器

並列摘要

In this paper, a slow frequency-hopping spread spectrum multiple access (SFH/SSMA) system over a Rayleigh fading channel is considered. We propose a low complexity diversity combining scheme using convolutional code. The proposed scheme uses the information in the currently received packet and the previously combined packet to increase the probability of correct decoding. Several existing diversity combining schemes using Reed-Solomon(RS) code with errors-and-erasures decoding are also discussed. Finally, the simulation results show that the proposed scheme in SFH/SSMA system provide a better performance than existing diversity combining schemes.

並列關鍵字

slow frequency-hopping spread spectrum multiple ； Rayleigh fading ； convolutional code ； diversity combining ； Reed-Solomon(RS) code

參考文獻

[1] Roger L. Peterson, Roger E. Ziemer and David E. Borth,

“Introduction to Spread Spectrum Communications”, Prentice Hall,

FH/SSMA Packet Radio Network,” IEEE Communication Letters, vol.

Frequency-Hopped Spread-Spectrum Multiple Access Communication

IEEE Journal on Selected Area in Communications, vol. 14, no. 9, pp.