The signals of 4F4T4PSK system are transmitted in the time-varying channels, and the output of the channels includes additive white noise and the sum of singals on several paths with different time delays, frequency shifts and arrival angles.

• 4F4T4PSK系统在时变信道上传输信息,信道输出为加性噪声和多条具有不同时延、不同频移和不同到达角传播路径信号的总和。