位元交錯對同步快速跳頻系統的影響

本篇論文探討位元交錯器(bit interleaver)的有無，在同步快速跳頻系統/M階頻率移鍵 (fast frequency-hopping system/M-ary frequency shift keying)的影響，我們主要探討的錯誤更正碼為摺積碼(convolutional codes)與渦輪碼(turbo codes)。文中以瑞雷衰減(Rayleigh fading)和白色高斯雜訊(additive white Gaussian noise, AWGN)模擬無線寬頻傳輸的通道。藉由電腦模擬的結果可知，本論文的系統使用沒有位元交錯的摺積碼或渦輪碼確實是最好的架構，效能亦大幅領先傳統的系統所使用的里德-所羅門碼(Reed-Solomon codes, RS code)。最後，文末提出沒有位元交錯的符元渦輪碼，為應用於本論文系統最好的錯誤更正碼。

關鍵字

位元交錯器；軟式決策；快速跳頻；摺積碼；渦輪碼

並列摘要

In this thesis, we investigate the effect of bit-interleaving on synchronous frequency hopping multiple access (FHSS) systems with convolutional codes and turbo codes. Broadband Rayleigh fading channel are considered. We proposed several soft-decoding methods for convolutional codes and turbo codes without bit-interleaving. Simulation results show that bit-interleaving degrades the performance of convolutional codes and turbo codes in FHSS systems. Moreover, both convolutional codes without bit-interleaving and turbo codes without bit-interleaving outperform Reed-Solomon codes with error-and-erasures decoding. Finally, the symbol-interleaving turbo code is the best error correction coding technique among the proposed methods.

並列關鍵字

bit-interleaver ； soft decision ； fast frequency-hopping ； convolutional codes ； turbo codes

參考文獻

Kluwer Academic Publishers, 2000.

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國際替代計量

位元交錯對同步快速跳頻系統的影響

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