Patent ID: 8532215

Claim:
A method for compensating for nonlinear distortion of a frequency-multiplexed (FM) signal in an amplifier, the method comprising: a) pre-distorting the FM signal prior to passing thereof through the amplifier in accordance with one or more adjustable pre-distortion parameters; b) passing the FM signal through the amplifier to obtain an output FM signal; c) sampling at least a portion of the output FM signal to obtain a sampled signal comprising a sequence of signal samples; d) computing a signal correlation matrix of size N×N for the sampled signal, wherein N is an integer greater than a number of frequency channels in the FM signal; e) estimating a signal to distortion ratio (SDR), or a function thereof, based on the signal correlation matrix; and, f) iteratively repeating steps a) to e) while varying the one or more adjustable pre-distortion parameters so as to increase the SDR.