| 摘要 |
A method and apparatus for reducing co-channel interference in a CDMA radio telephone system wherein a traffic channel signal is transmitted from a first station (e.g., a base station) (100) in the system to and a second station in the system (e.g., a mobile station) (200). 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 (100) to the second station (200). A reduced interference signal is formed at the second station (200) by subtracting an interference signal from the traffic channel signal. A decoded signal is formed at the second station (200) by decoding information representative of the reduced interference signal using a decoder (260) that outputs a plurality of metric values. The metric values are then used as inputs to a feedback loop (270, 272, 274, 276, 278, 280) that is used to form the interference signal that is subtracted from the traffic channel signal. In this feedback loop (270, 272, 274, 276, 278, 280), an estimated signal is formed in accordance with the plurality of metric values, a plurality of reconstructed CDMA signals are formed from the estimated signal, each of the reconstructed CDMA signals being modulated in accordance with a different one of the Walsh codes, and the reconstructed CDMA signals are then used to form to the interference signal. |
