FREQUENCY DOMAIN EQUALIZATION FOR TIME VARYING CHANNELS

摘要

Systems and methods for a wireless communication system are provided. The method includes estimating a time-variation of a channel through which the wireless communication system transmits. This also includes decreasing the estimated time-variation of the channel from a signal transmitted by the wireless communications system. An iterative process and components are provided to allow efficient and accurate frequency domain equalization. Various processing components remove or mitigate components of channel variation and recovers a circular convolution, in order that frequency domain equalization (FDE) structures developed for static channels become effective in time-varying channels. For time varying channels, a vector is determined which represents a degradation of the corresponding equivalence between the time domain and the frequency domain which is relied upon by the frequency domain equalization. Thus, a time variation cancellation process is performed where said vector is iteratively subtracted from the frequency domain equalization. In this manner, frequency domain equalization performance is improved in the presence of time varying channels.