METHOD FOR PRE-EQUALIZING A DATA SIGNAL BY FDD TIME REVERSAL

摘要

The invention relates to a method for pre-equalizing a data signal transmitted with frequency division duplexing (FDD) by an origin communicating entity (EC1) comprising origin antennas (A11,...A1M1) to a destination communicating entity (EC2) comprising destination antennas (A21,...A2M2). The method comprises: a step of a destination antenna (A2j) transmitting a first pilot sequence; a step of the origin entity estimating a first pulse response of a first propagation channel; an iterative step comprising the sub-steps of an origin antenna (A1i) transmitting a second pilot sequence modulated by the first pulse response, the destination entity estimating a combined pulse response of the first propagation channel and of a second propagation channel, the time reversal of the combined pulse response, the destination antenna transmitting a third pilot sequence modulated by said time-reversed combined pulse response, estimating a composite pulse response of the first and second propagation channels, the iterative step being repeated for a portion of the origin antennas and the steps of transmitting a first pilot sequence, estimating the first pulse response, and the iterative step being repeated for a portion of the destination antennas; and a step of determining pre-equalization coefficients of the data signal from a combination of a set of composite pulse responses.