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Blind Multi-User Equalisation for a Dispersive DS-CDMA Downlink under Carrier Frequency Offset Conditions

Blind Multi-User Equalisation for a Dispersive DS-CDMA Downlink under Carrier Frequency Offset Conditions
Blind Multi-User Equalisation for a Dispersive DS-CDMA Downlink under Carrier Frequency Offset Conditions
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.
constant modulus algorithm, adaptive equalisation
3-200-00165-8
2235-2238
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Hadef, M
afe928bb-6ce4-4060-8370-593fd2402cd6
Rupp, M
0c64c1d7-5b23-4cc3-b2e9-2ce89974cab6
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Hadef, M
afe928bb-6ce4-4060-8370-593fd2402cd6
Rupp, M
0c64c1d7-5b23-4cc3-b2e9-2ce89974cab6

Weiss, S, Hadef, M and Rupp, M (2004) Blind Multi-User Equalisation for a Dispersive DS-CDMA Downlink under Carrier Frequency Offset Conditions. 12th European Signal Processing Conference, Vienna, Austria. 06 - 09 Sep 2004. pp. 2235-2238 .

Record type: Conference or Workshop Item (Paper)

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.

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More information

Published date: 2004
Additional Information: Commentary On: invited paper Event Dates: September 7-10
Venue - Dates: 12th European Signal Processing Conference, Vienna, Austria, 2004-09-06 - 2004-09-09
Keywords: constant modulus algorithm, adaptive equalisation
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 259934
URI: http://eprints.soton.ac.uk/id/eprint/259934
ISBN: 3-200-00165-8
PURE UUID: 176d2142-642e-40e4-ad4a-37607b6c9369

Catalogue record

Date deposited: 13 Sep 2004
Last modified: 23 Sep 2020 16:34

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Contributors

Author: S Weiss
Author: M Hadef
Author: M Rupp

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