REDUCTION OF INTERFERENCE IN AN OFDM SIGNAL WITH WEIGHTING VECTORS EVOLVING IN VECTOR SUBSPACES

摘要

To reduce interference in signals (r1, r2) received by a receiver through a propagation channel, each comprising symbols distributed according to frequency and time dimensions and corresponding to one and the same signal emitted, the receiver weights an estimate (d) of the signal emitted and the signals received by weighting vectors (w1, W2, wd) evolving in vector subspaces representing the frequency variations and time variations of the channels for propagating the signals between an emitter and the receiver. These vector subspaces are defined by matrices some of whose columns are deleted according to frequency and time constraints of the channel. The receiver minimizes a function of the difference between the sum of weighted signals received and the weighted estimate of the signal emitted so as to estimate the signal emitted as a function of the weighting vectors and of the signals received.