Patent ID: 8363752
Filing Date: 2013-01-29
Classification: H04L

Abstract:
1. A communications transmitter, comprising: a symbol mapper configured to generate a sequence of symbols from a binary-source data stream containing a message to be transmitted; a pulse-shaping filter configured to generate a baseband signal based on said sequence of symbols; an average-to-minimum magnitude ratio (AMR) reduction circuit configured to compare magnitudes of samples of said baseband signal to a time-varying low-magnitude threshold that is varied at a rate equal to or dependent on a rate at which the symbol mapper generates the sequence of symbols, and modify said baseband signal to produce a modified baseband signal having a reduced AMR if a sample of said baseband signal is determined to have a magnitude less than said time-varying low-magnitude threshold; and a modulator configured to modulate a carrier signal based on modulation information contained in said modified baseband signal.