Patent ID: 8897404

Claim:
A method in a communication node for canceling interference between a plurality of signals in a communication system, wherein the communication system operates in a high phase noise environment, the method comprising: receiving, at each of a plurality of receiver antennas, a respective signal, wherein the received signals have a differential phase noise between them so that the communication system is degraded by the differential phase noise; canceling a first part of interference between the plurality of received signals before a clock signal generation, reducing an effect of clock timing difference associated with the received signals; after cancelling the first part of the interference, generating a clock signal which is synchronized with the received signals; filtering the interference cancelled signals and the received signals; and canceling a second part of interference between the filtered signals, which canceling the second part of interference is delayed to compensate for a delay in the canceling the first part of interference, and which canceling the second part of interference comprises phase rotating the filtered signals to increase tracking of the differential phase noise and suppression of the differential phase noise; and wherein the first part interference canceling before the filtering is larger than the second part interference canceling after the filtering.