Patent ID: 7675993

Claim:
A method of reducing the average-to-minimum magnitude ratio (AMR) of a communications signal having a sequence of symbols, comprising: obtaining a digital message for generating the communications signal having a sequence of symbols; applying a pulse-shaping technique to an instance of a pulse of a given form to generate a communications signal s(t); obtaining a minimum value ρ(t min ) of the magnitude of the generated communication signal s(t) at a time instant t_min in a time interval between two distinct time instants t1 and t2 (t 1 <t 2 ); generating, in the time interval between the time instants t 1 and t 2 , a correction signal with a predetermined impulse response r(t−t min ) which is obtained based on the minimum value and the predetermined signal envelope minimum if it is determined that ρ(t min ) is smaller than a predetermined signal envelope minimum; and adding the correction signal to the communications signal to generate a modified communications signal, wherein the communications signal is represented within a signal plane having an origin denoting a signal of zero magnitude; the minimum value of the magnitude of the communications signal is calculated from a distance from the origin to a first straight line spanning a coordinate of the communications signal s(t 1 ) and a coordinate of the communications signal s(t 2 ), and the method further comprises: determining the first straight line spanning the coordinate of the communications signal s(t 1 ) and the coordinate of the communications signal s(t 2 ) and a second straight line passing through the origin and being orthogonal to the first straight line; and calculating the minimum value ρ(t min ) of the magnitude of the communications signal from a distance from the origin to an intersection point of the first straight line and the second straight line.