Patent ID: 8306486
Filing Date: 2012-11-06
Classification: H04L

Abstract:
1. A method of reducing the average-to-minimum power ratio (AMPR) of communications signals in a communications transmitter, comprising: generating samples of a baseband signal that is formatted in accordance with a non-constant envelope modulation scheme; detecting whether a local minimum event is present among samples in an N-sample set of said samples, where N is an integer greater than or equal to three; and if a local minimum event is detected among the samples in said N-sample set of samples, modifying said baseband signal in the temporal vicinity of the detected local minimum event to form a modified baseband signal having a reduced AMPR, wherein detecting whether a local minimum event is present comprises detecting samples in said N-sample set that have magnitudes less than a low-magnitude threshold and identifying a lowest-magnitude sample from among samples of said N-sample set detected to have magnitudes less than said low-magnitude threshold.