Channel response noise reduction at digital receivers

摘要

According to various embodiments, apparatus and methods disclosed herein may be implemented in a digital communication (wired or wireless) receiver, and relate to minimizing noise in an estimated channel frequency response at the receiver for the purposes of channel equalization. The disclosed apparatus and methods may include determining a channel impulse response based on an estimated channel frequency response. The estimated channel frequency response, the channel impulse response, or both may include noise. An impulse response mask may be determined based on the channel impulse response, and further applied to the channel impulse response to obtain a noise-reduced channel impulse response, which may be Fourier transformed to obtain a noise-reduced channel frequency response.

主权项

1. A method comprising:
determining, using a processor, a channel impulse response based on an estimated channel frequency response, wherein the estimated channel frequency response, the channel impulse response, or both include noise; determining, using the processor, an impulse response mask including estimating each sample of the mask, wherein said estimating each sample of the mask includes determining an average of the channel impulse response, and applying a threshold on each sample of the average channel impulse response, such that sample values of the average channel impulse response below the threshold are set to zero; and applying, using the processor, the mask to the channel impulse response to obtain a noise-reduced channel frequency response.