相關跳頻序列的Viterbi譯碼算法及其糾錯性能分析
Viterbi Algorithm for DFH Sequence and Analysis of Its Error-Correcting Performance
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摘要: 該文分析了相關跳頻通信系統(tǒng)中頻率轉(zhuǎn)移函數(shù)的糾錯性能,將Viterbi算法應用于接收端跳變頻點序列的譯碼,并結合相關跳頻轉(zhuǎn)移函數(shù)的特點對譯碼過程作出了改進.針對滿足最大相關糾錯性能的頻率轉(zhuǎn)移函數(shù),詳細分析了Viterbi算法的譯碼性能.仿真結果表明,通過相關糾錯,對隨機錯誤在低信噪比條件下可以獲得5-8dB的增益.Abstract: In this paper the error-correcting performance of frequency transition function for Differential Frequency Hopping （DFH） communication system is analyzed first. Then a Viterbi algorithm is proposed and applied to frequency sequence decoding of DFH receiver, and it is further improved by the full use of the characteristics of transition function. The decoding performance of Viterbi algorithm is analyzed with the requirement that the transition function should achieve the best error-correcting performance. Simulation results show that 5- 8dB gain could be achieved for stochastic frequency detection error when SNR is low.
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