DocumentCode :
832274
Title :
Noncoherent MLSE in DS-CDMA wireless systems with antenna arrays
Author :
Abrardo, Andrea
Author_Institution :
Dept. of Inf. Eng., Univ. of Siena, Italy
Volume :
52
Issue :
6
fYear :
2003
Firstpage :
1435
Lastpage :
1446
Abstract :
This paper addresses the noncoherent detection problem for direct-sequence code-division multiple-access (DS-CDMA) signals in the presence of antenna arrays at the base station. An ideal open-loop power control, which compensates for the long-term variations due to path loss and shadowing experienced by the mobile users, is assumed. Then, the noncoherent maximum-likelihood sequence-estimation problem is analyzed under the assumption of spatially white interference. The contribution of this paper is to extend previous results obtained by the author in for the case of multiantenna receivers, including the derivation and analysis of two suboptimal detectors based on an approximate maximization of the transmitted symbols likelihood. The first detector works as a traditional squared envelope combiner, which fully exploits the K diversity degrees provided by the multiple antenna system. In the second case, the receiver assumes a perfect knowledge of antenna response vector, so that spatial filtering of the received signal is made possible. Simulation and theoretical results are provided for a widely used circular ring of scatterers spatial channel model, which allows analysis in a wide range of different environmental conditions.
Keywords :
adaptive signal detection; antenna arrays; code division multiple access; differential phase shift keying; diversity reception; maximum likelihood sequence estimation; mobile radio; spatial filters; spread spectrum communication; DS-CDMA wireless systems; M-DPSK modulation; antenna arrays; antenna response vector; base station; circular ring of scatterers; direct-sequence code-division multiple-access; diversity; maximum-likelihood sequence-estimation; multiantenna receivers; multiple antenna system; multiple differential phase-shift keying; noncoherent MLSE; noncoherent detection; open-loop power control; spatial channel model; spatial filtering; spatially white interference; squared envelope combiner; suboptimal detectors; Antenna arrays; Base stations; Envelope detectors; Interference; Maximum likelihood detection; Maximum likelihood estimation; Multiaccess communication; Power control; Receiving antennas; Shadow mapping;
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/TVT.2003.819454
Filename :
1247805
Link To Document :
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