针对差分跳频技术提出了一种G函数的非二进制卷积编码的等效模型,给出了差分跳频信号的最佳接收机设计方法,研究了维特比硬判决和维特比软判决两种最大似然检测算法,并对在AWGN信道下的两种最大似然检测算法的性能进行了计算机仿真。仿真结果表明,接收机采用最大似然检测算法对于改善系统的性能有明显的作用,对维特比硬判决法的实现方法进行了描述。
关 键 词 差分跳频;G函数;维特比算法
Abstract According to the characteristic of differential frequency hopping, this paper presents a nonbinary convolutional code equivalent model of G function and the design of optium receiver for differential frequency hopping signal. The paper also studies two maxium-likelihood detect algorithms (Viterbi hard-decision detection algorithm and Viterbi soft-decision algorithm) and computer simulations indicate that the maxium-likelihood method can greatly improves performance of differential frequency hopping system for AWGN channel .Finally ,the realization of Viterbi hard-decision detection algorithm is described.
Key words differential frequency hopping; G function; Viterbi algorithm
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