The problem of channel estimation and tracking for MIMO time-varying frequency-selective channels is investigated based on training sequences.
本文主要研究了基于训练序列的多输入多输出（MIMO）时变频率选择性衰落信道的估计与跟踪问题。
When the Angle modulation signals made up of the message model have passed through a randomly time-varying channel, a complex nonlinear estimation model is formed.
当此消息模型构成的角调信号通过随机时变信道后，形成复杂的非线性估计模型。
However, in the practical wireless environment, the number of channel taps and amplitude are all unknown and time-varying in whole process, thus typical estimation methods are not suitable.
实际无线环境中，多径分量数目与幅度都是时变的，则传统信道估计方法不再适用。
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