Abstract
A postbeamformer interference canceler (PIC) processes the signals derived from an antenna array by forming two beams using fixed beamforming weights. The weighted output of one beam, referred to as the interference beam, is subtracted from the other beam, referred to as the target beam. In a conventional beamforming method, both beams are formed using equal weighting on each element. For this case the PIC processor suppresses a substantial amount of the signal; its output contains a large amount of residual interference when the weight of the interference channel is adjusted to minimize the mean output power of the PIC. This article presents and analyzes two methods to reduce the signal suppression by the PIC. The analysis shows that in one case the signal suppression has been completely eliminated, while in the second case the output of the PIC does not contain any residual interference. The examples presented show that the output signal to noise ratio (SNR) of the PIC using these beamforming methods is larger than the output SNR of the PIC using conventional beamforming methods.
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