Patent ID: 7209524
Filing Date: 2007-04-24
Classification: H03F,H04B,H04H,H04J,H04L

Abstract:
1. A method of transmitting a transmitting signal having a legacy upper layer signal receivable by a plurality of legacy receivers and a plurality of layered modulation receivers and a lower layer signal non-coherently layered over the legacy upper layer signal, the lower layer signal receivable by the layered modulation receivers and not receivable by the legacy receivers, the method, comprising: transmitting the legacy upper layer signal including a first carrier and first signal symbols; and transmitting a lower layer signal including a second carrier and second signal symbols; wherein the layered modulation receivers demodulate the legacy upper layer signal to produce the first signal symbols, remodulate the first signal symbols, and subtract the remodulated first signal symbols from she demodulated legacy upper layer signal to produce the second signal symbols.