On estimation of multipath channels and residual carriers in CDMA communications
Ke-Min Li, Hui Liu · 2002
This paper addresses the problem of CDMA multiuser detection in the presence of unknown multipath channels and residual carriers. An analytic algorithm which provides closed-form channel and carrier offset estimates is proposed. The algorithm first converts the multiuser estimation problem into single-user problems, and then analytically solves the resulting multivariate parameter estimating problems utilizing a polynomial matrix projection property. The performance of proposed algorithm is investigated through first-order perturbation analysis. We also calculate the Cramer-Rao bound to illustrate the efficiency of the new algorithm. The analyses are supported by computer simulations.