Joint channel and carrier offset estimation in CDMA communications
K. Li, H. Liu · IEEE Transactions on Signal Processing · 1999
This paper addresses the problem of CDMA multiuser detection in the presence of unknown multipath channels and residual carriers. An analytic algorithm that 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 nonlinear multivariate optimization problems using a polynomial matrix projection property. The performance of the proposed algorithm is investigated: through first-order perturbation analysis. We also calculate the Cramer-Rao bound (CRB) to illustrate the efficiency of the new algorithm. The analyzes are supported by computer simulations.