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Titolo:
Adaptive multiuser detection and beamforming for interference suppression in CDMA mobile radio systems
Autore:
Kapoor, S; Gollamudi, S; Nagaraj, S; Huang, YF;
Indirizzi:
Univ Notre Dame, Dept Elect Engn, Notre Dame, IN 46556 USA Univ Notre Dame Notre Dame IN USA 46556 ct Engn, Notre Dame, IN 46556 USA
Titolo Testata:
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
fascicolo: 5, volume: 48, anno: 1999,
pagine: 1341 - 1355
SICI:
0018-9545(199909)48:5<1341:AMDABF>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
BOUNDED NOISE; WIRELESS CDMA; ARRAY; IDENTIFICATION; PARAMETERS; ANTENNA;
Keywords:
adaptive filters; array signal processing; code division multiaccess; direction of arrival estimation; interference suppression; mobile communication;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Kapoor, S NEC USA Inc, Princeton, NJ USA NEC USA Inc Princeton NJ USANEC USA Inc, Princeton, NJ USA
Citazione:
S. Kapoor et al., "Adaptive multiuser detection and beamforming for interference suppression in CDMA mobile radio systems", IEEE VEH T, 48(5), 1999, pp. 1341-1355

Abstract

This paper considers the problem of interference suppression in direct-sequence code division multiple-access (DS-CDMA) systems over fading channels,An adaptive array receiver is presented which integrates multiuser detection, beamforming, and RAKE reception to mitigate cochannel interference and fading. The adaptive multiuser detector is formulated using a blind constrained energy minimization criterion and adaptation is carried out using a novel algorithm based on set-membership parameter estimation theory. The proposed detector overcomes the shortcomings of conventional LMS- and RLS-type algorithms, namely, that of slow convergence and large computational load, respectively. This is especially the case when strong interferers are present or when the number of adaptive weights is relatively large. DS-CDMA systems can have a relatively large number of spatially distributed interferers. Thus beamforming is based on direction-of-arrival (DOA) estimates provided by an approximate maximum-likelihood estimator (DOA-MLE). Unlike previousapproaches, the DOA-MLE exploits the structure of the DS-CDMA signaling scheme resulting in robust performance and simple implementation in the presence of angle spreading, The overall method is suitable for real-time implementation and can substantially improve the interference suppression capabilities of a CDMA system.

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Documento generato il 14/07/20 alle ore 09:57:44