Joint channel and carrier offset estimation in CDMA communications |
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Authors: | Li K Liu H |
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Affiliation: | Dept. of Electr. Eng., Virginia Univ., Charlottesville, VA; |
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Abstract: | 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 |
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