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一種M-FSK信號的能量度量Viterbi軟譯碼算法性能分析

董彬虹,  唐鵬,  杜洋,  趙巖

董彬虹, 唐鵬, 杜洋, 趙巖. 一種M-FSK信號的能量度量Viterbi軟譯碼算法性能分析[J]. 電子與信息學報, 2015, 37(8): 1920-1925. doi: 10.11999/JEIT141532
引用本文: 董彬虹, 唐鵬, 杜洋, 趙巖. 一種M-FSK信號的能量度量Viterbi軟譯碼算法性能分析[J]. 電子與信息學報, 2015, 37(8): 1920-1925. doi: 10.11999/JEIT141532
Dong Bin-hong, Tang Peng, Du Yang, Zhao Yan. Performance Analysis of Energy Metrics for Viterbi Soft Decoding Algorithm Based on M-FSK Signal[J]. Journal of Electronics & Information Technology, 2015, 37(8): 1920-1925. doi: 10.11999/JEIT141532
Citation: Dong Bin-hong, Tang Peng, Du Yang, Zhao Yan. Performance Analysis of Energy Metrics for Viterbi Soft Decoding Algorithm Based on M-FSK Signal[J]. Journal of Electronics & Information Technology, 2015, 37(8): 1920-1925. doi: 10.11999/JEIT141532

一種M-FSK信號的能量度量Viterbi軟譯碼算法性能分析

doi: 10.11999/JEIT141532 cstr: 32379.14.JEIT141532
基金項目: 

國家自然科學基金(61201126)，新世紀優(yōu)秀人才支持計劃(NCET- 11-0058)和四川省青年科技基金(2012JQ0020)

Performance Analysis of Energy Metrics for Viterbi Soft Decoding Algorithm Based on M-FSK Signal

  • 摘要: Viterbi譯碼算法廣泛應(yīng)用于無線數(shù)字通信系統(tǒng)，一般采用比特對數(shù)似然信息(LLR)作為譯碼器的輸入。針對M-FSK信號，該文提出一種采用信號解調(diào)得到的M維能量信息，直接作為譯碼器分支度量值，并給出了相應(yīng)的Viterbi譯碼算法。在加性高斯白噪聲(AWGN)和瑞利(Rayleigh)衰落信道下對所提算法的BER性能進行了理論推導，得到了閉合表達式。通過仿真驗證了理論推導的正確性，與常規(guī)Viterbi算法相比，所提算法避免了比特LLR和分支度量值的計算，降低了算法復雜度和減少了信息損失，提高了M-FSK信號軟解調(diào)Viterbi譯碼算法的BER性能，是一種更適用于工程實現(xiàn)的M-FSK信號的Viterbi譯碼算法。
    Abstract: The Viterbi decoding algorithm is widely used in the wireless digital communication system, generally using the bit Log-Likelihood Ratio (LLR) as its input. For an M-ary Frequency Shift Keying (M-FSK) signal, a corresponding Viterbi decoding algorithm by directly adopting the M-dimensions energy information of the signal demodulation as the decoder branch metrics is proposed. This paper analyzes the theoretical performance of the proposed algorithm in the AWGN and the Rayleigh fading channels, and the upper bound for closed-form expressions of the Bit Error Rate (BER) performance are derived. The validity of the theoretical derivation is demonstrated by the simulations. Compared with the existing Viterbi algorithm, the proposed scheme can avoid the computing of the bit LLR and the branch metric, also it can descend the complex of the algorithm and decrease the loss of the information, improve the BER performance in the presence of Viterbi decoding algorithm which based on the M-FSK signal soft demodulation. Thus, the proposed scheme is a Viterbi decoding algorithm that is more adaptive to the actual project based on the M-FSK signal.
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出版歷程
  • 收稿日期:  2014-12-02
  • 修回日期:  2015-03-03
  • 刊出日期:  2015-08-19

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