METHODS AND SYSTEMS FOR CREST FACTOR REDUCTION IN MULTI-CARRIER MULTI-CHANNEL ARCHITECTURES

摘要

Crest factor reduction (CFR) can be performed on the various carriers of a multi-carrier multi-channel signal prior to modulation and/or beamforming operations in order to improve signal-to-noise ratios (SNRs) in the resulting wireless communication. More specifically, clipping noise is introduced into each of the individual carrier signals prior to application of the beamforming weight vectors, as well as prior to carrier modulation, thereby causing the beamforming weight vectors to be applied to both the signal and the clipping noise. As a result, variations between the signal antenna pattern and the clipping noise antenna pattern are reduced, which mitigates and/or reduces low SNR spatial locations in which the signal would have been drowned out by the clipping noise under conventional CFR.

主权项

1. A method for reducing a peak-to-average (PAR) ratio of a multi-carrier wireless signal, the method comprising:
generating a first carrier signal and a second carrier signal; introducing clipping noise into the first carrier signal and the second carrier signal, thereby obtaining a first clipped carrier signal and a second clipped carrier signal; and modulating the first clipped carrier signal and the second clipped carrier signal to obtain a modulated carrier signal.