CAJ | 학술논문

Viterbi 译码算法广泛应用于无线数字通信系统，一般采用比特对数似然信息(LLR)作为译码器的输入。针对M-FSK信号，该文提出一种采用信号解调得到的M维能量信息，直接作为译码器分支度量值，并给出了相应的Viterbi译码算法。在加性高斯白噪声(AWGN)和瑞利(Rayleigh)衰落信道下对所提算法的BER性能进行了理论推导，得到了闭合表达式。通过仿真验证了理论推导的正确性，与常规Viterbi算法相比，所提算法避免了比特LLR和分支度量值的计算，降低了算法复杂度和减少了信息损失，提高了M-FSK信号软解调Viterbi译码算法的BER性能，是一种更适用于工程实现的M-FSK信号的Viterbi译码算法。
Viterbi 역마산법엄범응용우무선수자통신계통，일반채용비특대수사연신식(LLR)작위역마기적수입。침대M-FSK신호，해문제출일충채용신호해조득도적M유능량신식，직접작위역마기분지도량치，병급출료상응적Viterbi역마산법。재가성고사백조성(AWGN)화서리(Rayleigh)쇠락신도하대소제산법적BER성능진행료이론추도，득도료폐합표체식。통과방진험증료이론추도적정학성，여상규Viterbi산법상비，소제산법피면료비특LLR화분지도량치적계산，강저료산법복잡도화감소료신식손실，제고료M-FSK신호연해조Viterbi역마산법적BER성능，시일충경괄용우공정실현적M-FSK신호적Viterbi역마산법。
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 anM-ary Frequency Shift Keying (M-FSK) signal, a corresponding Viterbi decoding algorithm by directly adopting theM-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 theM-FSK signal soft demodulation. Thus, the proposed scheme is a Viterbi decoding algorithm that is more adaptive to the actual project based on theM-FSK signal.