Patent ID: 8705649

Claim:
Method for estimating symbols transmitted in a time and frequency asynchronous OFDM radio communication system, said system comprising a plurality M R of base stations, each base station equipped with a plurality N R of receive antennas, comprising the steps of receiving in the same time slot and on the same OFDM-subcarrier at each of the plurality of N R receive antennas of the M R base stations a plurality of K transmit symbols from a plurality of K single antenna mobile stations, wherein M R >=2 and N R >=2 and estimating the carrier frequency offset of each link, and estimating the symbol timing offset of each link, and estimating the channel transfer function of each link, and computing a filter matrix of a linear filter based on the estimated frequency offsets and based on the estimated symbol timing offsets and based on the channel transfer function, and—applying a linear filtering on at least one of the plurality of K transmit symbols to estimate the symbol, wherein said filtering implements the filter matrix.