Patent ID: 7426243
Filing Date: 2008-09-16
Classification: H04L

Abstract:
1. An apparatus for receiving a non-coherent layered modulation signal comprising the sum of a first layer signal and a second layer signal, comprising: a tuner for receiving the non-coherent layered signal and producing a layered in-phase signal and a layered quadrature signal therefrom; an analog-to-digital converter for digitizing the layered in-phase signal and the layered quadrature signal; a digital processor for processing the digitized layered in-phase signal and the digitized layered quadrature signal to produce a lower layer in-phase signal, a lower layer quadrature signal, an upper layer in-phase signal and an upper layer quadrature signal, the processor comprising a subtractor configured to subtract an ideal upper layer in-phase signal from the digitized layered in-phase signal to produce the lower layer in-phase signal and to subtract an ideal upper layer quadrature signal from the digitized layered quadrature signal to produce the lower layer quadrature signal; a digital-to-analog encoder for converting the lower layer in-phase signal and the lower layer quadrature signal to a lower layer in-phase analog signal and a lower layer quadrature analog signal; and a modulator for modulating the lower layer in-phase analog signal and the lower layer quadrature analog signal to produce a lower layer signal.