Patent ID: 6580771
Filing Date: 2003-06-17
Classification: H04B,H04W

Abstract:
For use in a wireless communications system, a portion of a receiver employed for successive user data multipath interference cancellation comprising:a storage buffer capable of selectively storing samples from a wireless signal; a plurality of demodulators each corresponding to one of a plurality of resolvable paths within a multipath channel in which said wireless signal is transmitted, each demodulator including a delay unit and a signal multiplier capable of being selectively employed to estimate interference from a corresponding resolvable path on a portion of said wireless signal transmitted along a selected path within said multipath channel; a plurality of signal adders each capable of selectively subtracting said estimated interference on said wireless signal portion transmitted along said selected path from said wireless signal samples; and a controller capable of selectively causing, for each selected path within said multipath channel, said plurality of demodulators and said plurality of signal adders to perform an interference cancellation processing cycle in which said plurality of demodulators each estimate interference from said corresponding path on said wireless signal portion transmitted along said selected path, wherein each demodulators estimate complex gains and timing delays for interference from said corresponding path on said wireless signal transmitted along said selected path, and said plurality of signal adders each subtract said estimated interference on said wireless signal portion transmitted along said selected path from said wireless signal samples, each of said resolvable paths being selected in turn during said interference cancellation processing cycle until all resolvable paths have been selected, said controller capable of selectively causing said plurality of demodulators and said plurality of signal adders to iteratively perform said interference cancellation processing cycle on all paths within the multipath channel.