Method and system for iterative discrete fourier transform (DFT) based channel estimation using minimum mean square error (MMSE) techniques

摘要

A method and system for iterative discrete Fourier transform (DFT) based channel estimation using minimum mean square error (MMSE) techniques are presented. Aspects of the method and system include a procedure for computing channel estimates in both the time domain and frequency domain (or mixed domain) using an iterative DFT method based on MMSE techniques. One aspect of the method and system may achieve low computational complexity and produce more accurate channel estimate values in low signal to noise ratio (SNR) regimes in comparison to conventional DFT-based channel estimation methods, which utilize least squares (LS) techniques. The method and system disclosed herein may be practiced in connection with a wide range of orthogonal frequency division multiplexing (OFDM) based systems, for example wireless local area networks (WLAN, for example IEEE 802.11 WLAN systems), and LTE systems.

主权项

1. A method for processing signals, the method comprising:
performing by one or more processors and/or circuits: receiving a signal via a radio frequency (RF) channel, wherein said RF channel comprises a plurality of frequencies; computing one or more channel estimate values for a portion of said plurality of frequencies based on said received signal; and computing one or more subsequent channel estimate values for at least a subsequent portion of said plurality of frequencies by iteratively computing a time domain channel matrix and a frequency domain channel matrix based on said computed one or more channel estimate values and a channel noise value for said RF channel, wherein iteratively computing the frequency domain channel matrix includes applying a time-to-frequency transformation matrix to the time domain channel matrix, the time-to-frequency transformation matrix being computed using non-pilot tone frequencies.