Patent ID: 8411767
Filing Date: 2013-04-02
Classification: H04L

Abstract:
1. A method of communicating in a multiple access network using a time varying channel estimate in a receiver for receiving packets, the receiver retrieving orthogonal frequency-division multiplexing (OFDM) data symbols from a received signal and transforming the retrieved OFDM data symbols to a frequency domain, the method comprising: determining a matrix of training data symbols comprising data symbol estimates derived from a decoder; determining a matrix of frequency domain received OFDM data symbols; determining an intermediate channel estimate matrix by multiplying the matrix of frequency domain received OFDM data symbols by a conjugate of the matrix of training data symbols; determining an intermediate matrix of training weights comprising an absolute value of the matrix of training data symbols; performing a smoothing operation on both intermediate matrices comprising two-dimensional filtering; and determining the time varying channel estimate by dividing the smoothed channel estimate matrix with the smoothed training weight matrix.