MAI mitigation in DA ML carrier phase recovery loops for DS-CDMA systems

Abstract

This paper analytically investigates maximum-likelihood (ML) phase recovery in a multiuser system granting access through the direct sequence-code division multiple access (DS-CDMA) technique. A data-aided (DA) phase recovery loop is designed to face multiple access interference (MAI). Open- and closed-loop behaviour are studied and illustrated by computations. It is shown that the multiuser phase estimator mitigates MAI and exhibits a smaller variance than the single-user one.