Patent ID: 8948303
Filing Date: 2015-02-03
Classification: H04L

Abstract:
1. A method of crest factor reduction (CFR) using amplitude compression, executable by a communication device, the method comprising: receiving a complex input signal x(t) at a first sampling rate R up-sampling the complex input signal x(t) to a second sampling rate M·R computing an amplitude signal a(t) representing an amplitude of the up-sampled signal y(t) and sending the amplitude signal a(t) to an amplitude compressor of the communication device to extract the compressed gain g multiplying the gain g performing amplitude compression of the up-sampled complex signal y(t) by multiplying the gain signal g(t) with the up-sampled complex signal y(t) to produce the amplitude compressed signal z(t); performing signal filtering by the filter of the communication device on the amplitude compressed signal z(t) to generate a post-CFR signal u(t), wherein the post-CFR signal u(t) is at a higher sampling rate and with a lower peak to average (PAR) ratio than the complex input signal x(t).