Patent ID: 7391713

Claim:
A Crest Factor reduction method for use with multi-carrier signals in an electronic equipment to decrease the peak to average ratio of a multi-carrier signal in at least one of wireless communication system, wireless cellular, wireless PCS, wireless LAN, line of sight microwave, military, and satellite communication systems, the Crest Factor reduction method comprising: using a down conversion function to obtain the baseband representative of each carrier of a multi-carrier signal; applying a phase rotation function to phase rotate the baseband representative of each individual carrier by: using a peak to average ratio estimation function for a multi-carrier signal at baseband which includes intermediate frequency (IF) and radio frequency; using a pre-defined phase look up table for phase rotation of the baseband representative of each carrier of the multi-carrier signal; and using a phase rotation algorithm to define a final value and sign of each phase rotation applied to the baseband representative of each carrier of the multi-carrier signal; using a low pass filter to eliminate an unwanted signal from phase rotated baseband representative of each carrier of the multi-carrier signal; and using an up converter and combiner function to up convert the phase rotated and filtered baseband representative of each individual carrier to its original frequency and combine them to reconstruct a new Crest Factor reduced multi-carrier signal.