Blind parameter estimation in multiple-access systems

A blind algorithm for the estimation of amplitude, phase, and relative time delay of each user in multiple-access communication systems is proposed. T his algorithm is based on the cyclostationarity features of the received si gnals and provides estimates of the unknown parameters that are intrinsical ly immune to the effects of noise and interference, provided that a cycle f requency of the user signals exists which is not shared with the. disturban ce terms. The proposed estimators are, under mild assumptions, asymptotical ly unbiased and consistent. Moreover, the proposed algorithm is asymptotica lly near-far resistant and is not based on the usual assumption of white an d/or Gaussian noise.