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本文简要介绍一种恒包络连续相位调制——TFM调制方式,并以欧几里德距离为基础,研究TFM调制同速率R=1/2、记忆长度λ=2的卷积码结合之后的性能。结果表明:加上这类卷积码之后,若采用最大似然相干检测,最大可获得4.25dB的编码增益。其代价是主辩带宽随之增加。此外,给出的编码前后之篱笆图表明:与编码前相比,只有两个记忆单元的卷积码并不增加Viterbi接收机的复杂性。
In this paper, a kind of constant envelope continuous phase modulation-TFM modulation is briefly introduced. Based on the Euclidean distance, the convolutional code with TFM modulation at the same rate R = 1/2 and memory length λ = 2 is studied performance. The results show that, with the addition of such convolutional codes, maximum likelihood coherent detection with maximum gain of 4.25dB can be obtained. At the expense of the main debate bandwidth increases. In addition, the given fence map before and after coding shows that convolutional coding with only two memory cells does not increase the complexity of the Viterbi receiver compared to before encoding.