Patent ID: 6473417
Filing Date: 2002-10-29
Classification: H04B,H04J

Abstract:
A method for reducing co-channel interference in a code division multiple access (CDMA) radio telephone system wherein a traffic channel signal is transmitted from a first station in the system to a second station in the system, comprising the steps of:(a) forming a reduced interference signal at the second station by subtracting an interference signal from the traffic channel signal, wherein the traffic channel signal contains information representative of a plurality of CDMA data signals each of which is modulated with a different Walsh code prior to transmission of the traffic channel signal from the first station to the second station; (b) forming a decoded signal at the second station by decoding information representative of the reduced interference signal using a decoder that outputs a plurality of metric values; (c) forming an estimated signal in accordance with the plurality of metric values, and then forming the interference signal from the estimated signal, wherein the step of forming the interference signal includes the step of forming a plurality of reconstructed CDMA signals from the estimated signal, each of the reconstructed CDMA signals being modulated in accordance with a different one of the Walsh codes.