ADAPTIVE SIGNAL PROCESSOR FOR INTERFERENCE CANCELLATION

摘要

ADAPTIVE SIGNAL PROCESSOR FOR INTERFERENCE CANCELLATION The present invention relates to an adaptive signal processor for reducing interference in ranging and communication systems resulting from jamming or multipath reception. More particularly, an optical signal processor is provided in which a first time correlation is performed between the receive signal derived from a direction antenna and an interference signal derived from one or more auxiliary omnidirectional antennas in an acousto-optical device to obtain one or more corresponding weighting functions stored as a function of signal delay. The auxiliary signal is then correlated in a spatial correlation process in which the auxiliary signals are delayed and multiplied with the weights and the result spatially integrated to derive the predicted interference. The predicted interference is then subtracted from the main signal in an adaptive feedback loop wherein the predicted signal is made to approach equality with the interference. The system achieves good cancellation by correcting for multiple arrival times and by retaining the phase and amplitude information of the original carriers throughout the optical process.