Patent ID: 7675995
Filing Date: 2010-03-09
Classification: H04L

Abstract:
1. An apparatus for transmitting information in a communications signal, the information modulated, at least in part, with an angle-related characteristic, the apparatus comprising: a digital conversion circuit for converting information to be broadcast into a digital form; a constellation mapper, following the digital conversion circuit, for converting the digital information into information associated with a constellation; a trajectory generation circuit, following the constellation mapper, for generating samples denoting a trajectory within the constellation; a transition analysis circuit, following the trajectory generation circuit, for determining a change in value of the angle-related characteristic in a transition between two samples; a threshold detection circuit, following the transition analysis circuit, for detecting whether the change in value of the angle-related characteristic fails to meet a particular clip threshold; and an angle-related characteristic distribution circuit, following the threshold detection circuit, for determining a clip amount by which the change in value of the angle-related characteristic surpasses the clip threshold, and for distributing the clip amount to at least one other transition so that an amount of distribution matches the clip amount; and a radio frequency generator following the angle-related characteristic distribution circuit, the radio frequency generator generating a radio frequency signal depending upon an output signal of the angle-related characteristic distribution circuit, wherein the particular clip threshold is decided according to: the capability of the radio frequency generator to changing angle-related characteristic; and a spectral content of the angle-related characteristic.