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本文提出了一种新的准最佳接收机,来检测随机多普勒散布信道中传输的信号,特别讨论了第一类信道和恒定包络传输信号情况。该接收机由积分器、抽样器和二次型滤波器构成。文中给出了该接收机有关性能的数字结果,特别是给出了差错概率与抽样数(或抽样率)间的关系曲线;阐明了信号持续时间同信道相干时间比的重要性;给定信噪比时,如何选择传输信号持续时间和抽样率。
In this paper, a new quasi-optimal receiver is proposed to detect the signals transmitted in a random Doppler spread channel. In particular, the first type of channel and the constant envelope transmission are discussed. The receiver consists of an integrator, sampler and quadratic filter. The numerical results of the performance of the receiver are given in the paper, especially the relationship between the error probability and the number of samples (or sampling rate) is given. The importance of the signal duration to the channel coherence time ratio is clarified. How to choose the duration of the transmitted signal and the sampling rate when the noise ratio is high.