Blind multi-user equalisation for a dispersive DS-CDMA downlink under carrier frequency offset conditions

S. Weiss, M. Hadef, M. Rupp

Research output: Contribution to conferencePaper

Abstract

We address blind multiuser detection in a DS-CDMA downlink channel in the presence of carrier frequency offset. The synchronous users are separated by re-establishing orthogonality of their spreading sequences in a shared equaliser at the chip level. The adaptation algorithm is based on a constant modulus criterion of the various users, for which a stochastic gradient descent algorithm can be derived. We show that the resulting filtered-error filtered-regressor algorithm requires modifications in order to cope with carrier offset, and propose an combined blind multiuser equaliser with blind carrier frequency offset estimation. Simulations demonstrating the algorithm's convergence and BER performance are presented.
LanguageEnglish
Pages2235-2238
Number of pages4
Publication statusPublished - Sep 2004
Event12th European Signal Processing Conference - Vienna, Austria
Duration: 6 Sep 200410 Sep 2004

Conference

Conference12th European Signal Processing Conference
Abbreviated titleEUSIPCO 2004
CountryAustria
CityVienna
Period6/09/0410/09/04

Fingerprint

Code division multiple access
Equalizers
Multiuser detection

Keywords

  • blind multi-user
  • equalisation
  • dispersive ds-cdma
  • downlink
  • carrier frequency
  • offset conditions

Cite this

Weiss, S., Hadef, M., & Rupp, M. (2004). Blind multi-user equalisation for a dispersive DS-CDMA downlink under carrier frequency offset conditions. 2235-2238. Paper presented at 12th European Signal Processing Conference, Vienna, Austria.
Weiss, S. ; Hadef, M. ; Rupp, M. / Blind multi-user equalisation for a dispersive DS-CDMA downlink under carrier frequency offset conditions. Paper presented at 12th European Signal Processing Conference, Vienna, Austria.4 p.
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Weiss, S, Hadef, M & Rupp, M 2004, 'Blind multi-user equalisation for a dispersive DS-CDMA downlink under carrier frequency offset conditions' Paper presented at 12th European Signal Processing Conference, Vienna, Austria, 6/09/04 - 10/09/04, pp. 2235-2238.

Blind multi-user equalisation for a dispersive DS-CDMA downlink under carrier frequency offset conditions. / Weiss, S.; Hadef, M.; Rupp, M.

2004. 2235-2238 Paper presented at 12th European Signal Processing Conference, Vienna, Austria.

Research output: Contribution to conferencePaper

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AU - Weiss, S.

AU - Hadef, M.

AU - Rupp, M.

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N2 - We address blind multiuser detection in a DS-CDMA downlink channel in the presence of carrier frequency offset. The synchronous users are separated by re-establishing orthogonality of their spreading sequences in a shared equaliser at the chip level. The adaptation algorithm is based on a constant modulus criterion of the various users, for which a stochastic gradient descent algorithm can be derived. We show that the resulting filtered-error filtered-regressor algorithm requires modifications in order to cope with carrier offset, and propose an combined blind multiuser equaliser with blind carrier frequency offset estimation. Simulations demonstrating the algorithm's convergence and BER performance are presented.

AB - We address blind multiuser detection in a DS-CDMA downlink channel in the presence of carrier frequency offset. The synchronous users are separated by re-establishing orthogonality of their spreading sequences in a shared equaliser at the chip level. The adaptation algorithm is based on a constant modulus criterion of the various users, for which a stochastic gradient descent algorithm can be derived. We show that the resulting filtered-error filtered-regressor algorithm requires modifications in order to cope with carrier offset, and propose an combined blind multiuser equaliser with blind carrier frequency offset estimation. Simulations demonstrating the algorithm's convergence and BER performance are presented.

KW - blind multi-user

KW - equalisation

KW - dispersive ds-cdma

KW - downlink

KW - carrier frequency

KW - offset conditions

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Weiss S, Hadef M, Rupp M. Blind multi-user equalisation for a dispersive DS-CDMA downlink under carrier frequency offset conditions. 2004. Paper presented at 12th European Signal Processing Conference, Vienna, Austria.