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针对时变频率选择性衰落信道,研究了连续相位调制(CPM)信号的逐幸存检测算法。该算法在未知信道状态的条件下,利用训练序列对信道参数进行初始估计。在对CPM信号进行Viterbi解调过程中,采用PSP技术实现信道的无延时跟踪。基于频域均衡的CPM检测算法虽然可以有效抗多径干扰且计算复杂度较低,但不能对时变信道进行跟踪。仿真结果表明,在时变多径信道下,基于PSP均衡的CPM检测算法能有效地进行信道参数估计,比频域均衡算法具有更好的误码性能。
For time-varying frequency-selective fading channels, a per-survivor detection algorithm for continuous phase modulation (CPM) signals is studied. The algorithm uses the training sequence to estimate the channel parameters under the condition of unknown channel. In Viterbi demodulation process of CPM signal, the PSP technology is used to realize the delay-free tracking of the channel. Although the CPM detection algorithm based on frequency domain equalization can effectively resist multipath interference and has low computational complexity, it can not track time-varying channels. The simulation results show that the CPM detection algorithm based on PSP equalization can effectively estimate the channel parameters under time-varying multipath channel, and has better error performance than frequency domain equalization algorithm.