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通过研究软判决维特比译码算法的基本原理,提出了一种基于Simulink的软判决维特比译码算法建模仿真方法。为了验证该算法模型的正确性。建立了基于Simulink的具有卷积编码、软判决维特比译码完整的通信系统仿真模型,通过仿真所得到的误码率与软判决理论误码率的对比证明了所建立的仿真系统的正确性。最后,为了比较硬判决译码算法与软判决译码算法的性能,建立了硬判决维特比译码算法的仿真模型,并与软判决维特比译码性能进行了对比分析,仿真结果表明:在相同误码性能条件下,软判决译码算法的信噪比要比硬判决译码算法提升2 dB。
By studying the basic principle of soft decision Viterbi decoding algorithm, a modeling and simulation method of soft decision Viterbi decoding algorithm based on Simulink is proposed. In order to verify the correctness of the algorithm model. A complete communication system simulation model with convolutional coding and soft decision Viterbi decoding based on Simulink is established. The correctness of the established simulation system is verified by comparison between the bit error rate obtained by simulation and the bit error rate of soft decision . Finally, in order to compare the performance of the hard decision decoding algorithm and the soft decision decoding algorithm, a simulation model of the hard decision Viterbi decoding algorithm is established and compared with the soft decision Viterbi decoding performance. The simulation results show that in the With the same bit error rate performance, the SNR of soft decision decoding algorithm is 2 dB better than the hard decision decoding algorithm.