Patent ID: 7634024

Claim:
An apparatus for use in a communication system transmitter, the apparatus comprising: a baseband processor having an output configured for coupling via an upconverter to an input of a power amplifier of the transmitter; the baseband processor comprising a crest factor reduction element implementing an adaptive peak windowing algorithm for application to an input signal, the adaptive peak windowing algorithm comprising a windowing function that is adaptively adjustable for reducing interference among different peaks of the input signal; wherein, after a complete peak pulse of the input signal is observed in a current window, a corresponding sequence of samples is saved as a first vector; wherein the first vector is processed to generate a second vector which corresponds to the first vector prefixed and suffixed with one or more values, the prefixing and suffixing being based at least in part on the length of the first vector and the length of the current window; and wherein the windowing function is adaptively adjustable based at least in part on the second vector.