Patent ID: 8483312

Claim:
A communications transmitter comprising: a baseband modulator configured to generate a baseband signal from a binary-source data stream containing a message to be transmitted; an average-to-minimum magnitude ratio (AMR) reduction circuit configured to receive samples of the baseband signal, determine a local minimum of the samples of the baseband signal, and compare a magnitude of the local minimum to a first magnitude threshold and a second magnitude threshold greater than the first magnitude threshold, wherein when the magnitude of the local minimum is less than the first magnitude threshold, the AMR reduction circuit modifies the baseband signal in a first manner, and when the magnitude of the local minimum is between the first magnitude threshold and the second magnitude threshold, the AMR reduction circuit modifies the baseband signal in a second manner different from the first manner; and a modulator configured to modulate a carrier signal based on modulation information contained in the modified baseband signal, wherein the AMR reduction circuit includes a local minimum detector configured to detect the local minimum of the samples of the baseband signal.