Patent ID: 6868078

Claim:
A base station spread-spectrum code division multiple access (CDMA) interference canceller for reducing interference in a received spread-spectrum CDMA signal having N channels, with each of the N channels identified by a distinct chip-code signal, comprising: a plurality of means for generating a plurality of chip-code signals; a plurality of despreading means, with each of said despreading means responsive to the respective distinct chip-code signal identifying a corresponding one of the N channels, for simultaneously despreading a plurality of spread-spectrum channels of a spread-spectrum CDMA signal as a plurality of despread signals, respectively; a plurality of delay means providing proper timing for the plurality of chip-code signals; a plurality of means, responsive to the plurality of delayed chip-code signals, for simultaneously spread-spectrum processing the plurality of despread signals, respectively, with a chip-code-signal corresponding to a respective despread signal; means, for an i th chip-code signal, for simultaneously subtracting from the spread-spectrum CDMA signal, each of N−1 spread-spectrum-processed-despread signals, with the N−1 spread-spectrum-processed-despread signals excluding a spread-spectrum processed-despread signal of the i th despread signal, thereby generating a subtracted signal; and channel means for despreading the subtracted signal with the i th chip-code signal as an i th channel.