針對(duì)差分跳頻技術(shù)提出了一種G函數(shù)的非二進(jìn)制卷積編碼的等效模型，給出了差分跳頻信號(hào)的最佳接收機(jī)設(shè)計(jì)方法，研究了維特比硬判決和維特比軟判決兩種最大似然檢測(cè)算法，并對(duì)在AWGN信道下的兩種最大似然檢測(cè)算法的性能進(jìn)行了計(jì)算機(jī)仿真。仿真結(jié)果表明，接收機(jī)采用最大似然檢測(cè)算法對(duì)于改善系統(tǒng)的性能有明顯的作用，對(duì)維特比硬判決法的實(shí)現(xiàn)方法進(jìn)行了描述。
關(guān) 鍵 詞 差分跳頻；G函數(shù)；維特比算法

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