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Titolo:
Linear multiuser receivers: Effective interference, effective bandwidth and user capacity
Autore:
Tse, DNC; Hanly, SV;
Indirizzi:
Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 omp Sci, Berkeley, CA 94720 USA Univ Melbourne, Dept Elect Engn, Melbourne, Vic, Australia Univ MelbourneMelbourne Vic Australia t Engn, Melbourne, Vic, Australia
Titolo Testata:
IEEE TRANSACTIONS ON INFORMATION THEORY
fascicolo: 2, volume: 45, anno: 1999,
pagine: 641 - 657
SICI:
0018-9448(199903)45:2<641:LMREIE>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
MULTIPLE-ACCESS CHANNELS; DETECTORS; SYSTEMS; CDMA;
Keywords:
decorrelator; effective bandwidth; effective interference; MMSE receiver; multiuser detection; power control; user capacity; random spreading sequences;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Tse, DNC Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 Berkeley, CA 94720 USA
Citazione:
D.N.C. Tse e S.V. Hanly, "Linear multiuser receivers: Effective interference, effective bandwidth and user capacity", IEEE INFO T, 45(2), 1999, pp. 641-657

Abstract

Multiuser receivers improve the performance of spread-spectrum and antenna-array systems by exploiting the structure of the multiaccess interference when demodulating the signal of a user. Much of the previous work on the performance analysis of multiuser receivers has focused on their ability to reject worst case interference. Their performance in a power-controlled network and the resulting user capacity are less well-understood. In this paper, me show that in a large system with each user using random spreading sequences, the limiting interference effects under several linear multiuser receivers can be decoupled, such that each interferer can be ascribed a level of effective interference that it provides to the user to be demodulated, Applying these results to the uplink of a single power-controlled cell, we derive an effective bandwidth characterization of the user capacity: the signal-to-interference requirements of all the users can be met if and only ifthe sum of the effective bandwidths of the users is less than the total number of degrees of freedom in the system. The effective bandwidth of a userdepends only on its own SIR requirement, and simple expressions are derived for three linear receivers: the conventional matched filter, the decorrelator, and the MMSE receiver. The effective bandwidths under the three receivers serve as a basis for performance comparison.

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Documento generato il 12/07/20 alle ore 09:33:11