Title :
MAI mitigation in DA ML carrier phase recovery loops for DS-CDMA systems
Author :
Schumacher, L. ; Vandendorpe, L.
Author_Institution :
Commun. & Remote Sensing Lab., Univ. Catholique de Louvain, Belgium
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
Keywords :
AWGN channels; closed loop systems; code division multiple access; demodulation; interference suppression; jitter; land mobile radio; maximum likelihood estimation; multiuser channels; phase estimation; phase shift keying; radiofrequency interference; spread spectrum communication; AWGN channel; BPSK-modulated data symbols; Cramer-Rao lower bound; DA ML carrier phase recovery loops; DS-CDMA systems; MAI mitigation; MLE; closed-loop behaviour; correlation properties; data-aided phase recovery loop; direct sequence-code division multiple access; land mobile radio; loop noise; maximum-likelihood phase recovery; multiple access interference; multiuser parameter estimation; multiuser phase estimator; multiuser phase jitter variance; multiuser system; open-loop behaviour; optimal multiuser detection; single-user recovery loops; uplink; Face detection; Frequency estimation; Laboratories; Multiaccess communication; Multiple access interference; Multiple signal classification; Multiuser detection; Parameter estimation; Phase estimation; Remote sensing;
Conference_Titel :
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-5435-4
DOI :
10.1109/VETECF.1999.801717
