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Titolo:
Channel acquisition for wideband CDMA signals
Autore:
Tripathi, V; Mantravadi, A; Veeravalli, VV;
Indirizzi:
Cornell Univ, Sch Elect Engn, Ithaca, NY 14853 USA Cornell Univ Ithaca NYUSA 14853 iv, Sch Elect Engn, Ithaca, NY 14853 USA
Titolo Testata:
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
fascicolo: 8, volume: 18, anno: 2000,
pagine: 1483 - 1494
SICI:
0733-8716(200008)18:8<1483:CAFWCS>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADAPTIVE INTERFERENCE SUPPRESSION; DIRECT-SEQUENCE CDMA;
Keywords:
bandlimited communication; code division multiaccess; fading channels; least mean square methods; maximum likelihood estimation; multiuser channels;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Tripathi, V Cornell Univ, Sch Elect Engn, Ithaca, NY 14853 USA Cornell Univ Ithaca NY USA 14853 t Engn, Ithaca, NY 14853 USA
Citazione:
V. Tripathi et al., "Channel acquisition for wideband CDMA signals", IEEE J SEL, 18(8), 2000, pp. 1483-1494

Abstract

The problem of initial acquisition of the channel parameters of a widebandCDMA signal received in a multipath fading environment with multiaccess interference is considered. Since the signal is wideband, the fading is frequency selective and the parameters of interest are the (complex) gains and delays in the corresponding tapped delay line model for the channel. The scenario considered is one where a single new user is to be acquired on the reverse link by the base station, and where the channel parameters of the interfering users are known, Following a minimum mean squared error (MMSE) strategy for suppressing the multiaccess interference, the parameter estimation problem is posed in a maximum likelihood framework. To reduce complexity,the solution is implemented in two stages: first, the estimated tap delaysare restricted to be at chip spacings; second, the number of taps is reduced by allowing for arbitrary spacing between them. The performance of the proposed techniques is studied through numerical simulations. It is shown that significant gains can be obtained by exploiting the structure of the interference and acquiring the channel parameters jointly.

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Documento generato il 31/03/20 alle ore 16:00:59