PRE-EQUALIZING METHOD USING FDD TIME REVERSAL

摘要

The invention relates to a method for pre-equalizing a data signal transmitted using frequency division duplexing (FDD) by a source communicating entity (EC1) including source antennas (A11,...A1M1) to a destination communicating entity (EC2) including destination antennas (A21,...A2M2). The method comprises: a reference source antenna (A1ref) receiving a first pilot sequence transmitted by a destination antenna (A2j) via a first propagation channel; estimating a first pulse response representing the propagation channel; the destination antenna receiving a second pilot sequence transmitted by a source antenna (A1i,) via a second propagation channel; estimating a second pulse response representing the second propagation channel; the reference antenna receiving a third pilot sequence modulated by the second pulse response and transmitted by the destination antenna; estimating a combined pulse response representing the series of second and first propagation channels; the time reversal of the combined pulse response; combining the time-reversed combined pulse response and the first pulse response, wherein the steps are repeated for some of the destination antennas and source antennas; and determining pre-equalizing coefficients for the data signal from a set of pulse response combinations.