Adaptive cancellation of mutual interference in spread multiple access

A conceptual approach to a new spread spectrum receiver-demodulator is presented which obtains improved performance in a spread spectrum multiple access environment by the adaptive cancellation of the interference signals of other users. The approach assumes, among other things, that the pseudo-random sequences which are used as spreading codes are known to the receiver. An idealized system is analyzed to show that, when the output signal-to-noise ratio is low, the performance of the technique approaches that of a conventional receiver; however, when the signal-to-noise ratio and the processing gain are high, the output is shown to be essentially independent of the signals of the other users.