Blind Chip-Rate Equalisation for DS-CDMA Downlink Receiver
Blind Chip-Rate Equalisation for DS-CDMA Downlink Receiver
A dispersive channel in the DS-CDMA downlink destroys the orthogonality of the synchronous users' spreading sequences. In this paper, we aim to re-establish this orthogonality blindly by means of a common chip-level equaliser. The adaptation algorithm is based on a constant modulus criterion forcing the various user symbols onto a constant modulus, for which a stochastic gradient descent algorithm is derived. This algorithm is structurally similar to a multiple error filtered-X LMS type approach, whereby the equaliser input CM update is replaced by a spreading code filtered version. Various simulations demonstrating the algorithm's convergence and noise performance are presented.
0-7803-8104-1
1283-1287
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Hadef, M
afe928bb-6ce4-4060-8370-593fd2402cd6
Konrad, M
21a52515-17ab-4755-a71f-3f227fcf03f7
Rupp, M
0c64c1d7-5b23-4cc3-b2e9-2ce89974cab6
2003
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Hadef, M
afe928bb-6ce4-4060-8370-593fd2402cd6
Konrad, M
21a52515-17ab-4755-a71f-3f227fcf03f7
Rupp, M
0c64c1d7-5b23-4cc3-b2e9-2ce89974cab6
Weiss, S, Hadef, M, Konrad, M and Rupp, M
(2003)
Blind Chip-Rate Equalisation for DS-CDMA Downlink Receiver.
37th Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA.
09 - 12 Nov 2003.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
A dispersive channel in the DS-CDMA downlink destroys the orthogonality of the synchronous users' spreading sequences. In this paper, we aim to re-establish this orthogonality blindly by means of a common chip-level equaliser. The adaptation algorithm is based on a constant modulus criterion forcing the various user symbols onto a constant modulus, for which a stochastic gradient descent algorithm is derived. This algorithm is structurally similar to a multiple error filtered-X LMS type approach, whereby the equaliser input CM update is replaced by a spreading code filtered version. Various simulations demonstrating the algorithm's convergence and noise performance are presented.
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Published date: 2003
Additional Information:
Event Dates: November 9-12
Venue - Dates:
37th Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, 2003-11-09 - 2003-11-12
Organisations:
Electronics & Computer Science
Identifiers
Local EPrints ID: 259149
URI: http://eprints.soton.ac.uk/id/eprint/259149
ISBN: 0-7803-8104-1
PURE UUID: 21212237-e670-48bc-8951-59f9263d36a0
Catalogue record
Date deposited: 13 Mar 2004
Last modified: 14 Mar 2024 06:20
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Contributors
Author:
S Weiss
Author:
M Hadef
Author:
M Konrad
Author:
M Rupp
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