Patent ID: 8774731
Filing Date: 2014-07-08
Classification: H04B

Abstract:
1. An apparatus for a satellite communication system comprising: a processor configured to determine at least one of a phase offset for a frequency channel of a plurality of frequency channels de-multiplexed from a carrier to compensate for group delay variation within the carrier and a gain offset for the frequency channel to compensate for gain variation within the carrier, wherein the processor is further configured to apply the at least one out of the determined phase offset and gain offset to the frequency channel before the carrier is reformed from said plurality of frequency channels, wherein the phase offset is determined for each frequency channel of the plurality of frequency channels in dependence on the phase of other frequency channels of said plurality of frequency channels to provide an approximation of group delay flatness across the bandwidth of the carrier, and wherein the gain offset is determined for the frequency channel to provide an approximation of gain flatness across the carrier and to compensate for unwanted gain and group delay variation introduced before and after the application of the determined gain and phase offsets.