針對差分跳頻技術提出了一種G函數的非二進制卷積編碼的等效模型，給出了差分跳頻信號的最佳接收機設計方法，研究了維特比硬判決和維特比軟判決兩種最大似然檢測算法，并對在AWGN信道下的兩種最大似然檢測算法的性能進行了計算機仿真。仿真結果表明，接收機采用最大似然檢測算法對于改善系統的性能有明顯的作用，對維特比硬判決法的實現方法進行了描述。
關 鍵 詞 差分跳頻；G函數；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