Patent ID: 8130818
Filing Date: 2012-03-06
Classification: H04H,H04N,Y02D

Abstract:
1. A method for transmitting signals and receiving signals in a legacy receiver and a layered modulation receiver, comprising: amplifying an upper layer signal portion of a downlink signal at a first power level within a frequency band of the downlink signal; amplifying a lower layer signal portion of the downlink signal at a second power level within the frequency band of the downlink signal, the second power level being exceeded by the first power level; transmitting a layered modulation signal, the layered modulation signal comprising both the amplified upper layer signal portion and the amplified lower layer signal portion interfering with each other within the frequency band, wherein the amplified upper layer signal portion is transmitted by a first transponder and the amplified lower layer signal portion is transmitted by a second transponder and transmitting at the same polarization; demodulating the upper layer signal directly from the layered modulation signal in a legacy receiver and in a layered modulation receiver; and demodulating the lower layer signal after subtracting a remodulated upper layer signal from the layered modulation signal in the layered modulation receiver and not in the legacy receiver; wherein the lower layer signal portion includes a lower layer symbol rate, the upper layer signal portion includes an upper layer symbol rate, and the lower layer symbol rate is lower than the upper layer symbol rate.