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Blind estimation of amplitudes, phases, time delays, and frequency shifts in multiuser communication systems

This paper considers the problem of estimating amplitude, phase, time delay, and frequency shift of each user in a multiple-access communication system. An algorithm based on the cyclostationarity features of the received signal is proposed. It provides estimates of the unknown parameters that are intrinsically immune to the effects of noise and interference. The algorithm requires no preamble and is not based on the usual assumption of white noise.