Patent ID: 7304939
Filing Date: 2007-12-04
Classification: H04L

Abstract:
1. A method of communicating over a communications channel comprising: receiving, at a device, a received signal that includes a remotely transmitted signal, where said remotely transmitted signal is in a given frequency band; and transmitting, at said device, concurrent with said receiving, a locally transmitted signal in said given frequency band, where said locally transmitted signal is substantially orthogonal to said remotely transmitted signal, wherein said remotely transmitted signal has a first set of sub-carrier center frequencies characterized by a presence of signal, and a first set of zero signal frequencies characterized by an absence of signal and said transmitting comprises transmitting said locally transmitted signal having a second set of sub-carrier center frequencies and a second set of zero signal frequencies, where said second set of sub-carrier center frequencies correspond in frequency to said first set of zero signal frequencies and said second set of zero signal frequencies correspond in frequency to said first set of sub-carrier center frequencies.