Patent ID: 8351542

Claim:
An apparatus comprising: an input section that receives an input signal and that generates an intermediate signal, wherein the input section includes: an interface that receives the input signal and that generates a wideband signal; a crest factor reduction (CFR) unit that reduces a peak-to-average ratio (PAR) of the wideband signal, wherein the CFR unit has a stage that includes: a peak detector that detects a peak from the wideband signal; and a cancellation pulse calculator that is coupled to the peak detector and that calculates a cancellation pulse having an envelop and phase information that are approximately the same as the peak, wherein the cancellation pulse calculator includes: a gain calculator that is coupled to the peak detector and that that calculates a gain from the magnitude of the peak and a threshold; a contribution calculator that is coupled to the peak detector and that approximates each carrier's contribution to the peak; a coefficient calculator that is coupled to the contribution calculator and that calculates a cancellation pulse coefficient for each carrier from its contribution to the peak; a first pulse calculator that is coupled to the coefficient calculator and that calculates a base cancellation pulse from the cancellation pulse coefficients for each carrier; a second pulse calculator that is coupled to the gain calculator and to the first pulse calculator and that calculate a cancellation pulse from the base cancellation pulse and the gaiff, and a peak canceller that is coupled to the peak detector and to the second pulse calculator and that applies the cancellation pulse to the wideband signal; output logic that receives a signal the wideband signal from the CFR unit having a reduced PAR and that generates the intermediate signal; and an output section that receives the intermediate signal and that generates a transmission signal.