Finite precision decorrelating receivers for multi-user CDMA communication systems

Linear decorrelating receivers for direct-sequence spread spectrum multiple access communication systems appear to be the most promising candidates for practical implementations of multi-user detectors. Decorrelating receivers compare favorably to other receiver structures because they are optimally near-far resistant, they do not require knowledge of the received signal amplitudes, and their computational complexity is on the same order as that of the conventional matched filter detector. However, in general optimum single user decorrelating receivers correlate the received signal with a sequence of real numbers and complexity comparisons did not reflect the need for a floating point multiplier in optimum decorrelating receivers. The authors focus on the problem of demodulating a single user's signal in a multi-user environment. More specifically, they investigate the question whether it is possible to design single-user receivers which are identical in structure and complexity to the conventional matched filter receiver.<>