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Adaptive Blind Chip-Level Multiuser Detection in Multi-Rate Synchronous DS-CDMA System with Partial Loading

Adaptive Blind Chip-Level Multiuser Detection in Multi-Rate Synchronous DS-CDMA System with Partial Loading
Adaptive Blind Chip-Level Multiuser Detection in Multi-Rate Synchronous DS-CDMA System with Partial Loading
This paper addresses an adaptive blind multiuser detection strategy for a multi-rate direct sequence CDMA downlink channel. Specifically, two chip-level equalisation schemes, using either variable spreading length (VSL) or multi-code (MCD) multi-rate access modes, are proposed and tested. Both equalisers can be updated by minimising a hybrid CM/MSE cost function based on the constant modulus (CM) criterion for active users and a mean square error (MSE) criterion for inactive users in a partially loaded system. The BER performance abd the convergence of the proposed algorithms are analysed and compared through various simulations in both partially and fully loaded systems. Essentially, our results show that the VSL algorithm exhibits faster convergence than the MCD scheme while similar BER performance over different multi-path channels is achieved.
115-118
Hadef, M
afe928bb-6ce4-4060-8370-593fd2402cd6
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Hadef, M
afe928bb-6ce4-4060-8370-593fd2402cd6
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476

Hadef, M and Weiss, S (2004) Adaptive Blind Chip-Level Multiuser Detection in Multi-Rate Synchronous DS-CDMA System with Partial Loading. 2nd International Workshop on Signal Processing for Wireless Communications, Kings' College London. 01 - 03 Jun 2004. pp. 115-118 .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper addresses an adaptive blind multiuser detection strategy for a multi-rate direct sequence CDMA downlink channel. Specifically, two chip-level equalisation schemes, using either variable spreading length (VSL) or multi-code (MCD) multi-rate access modes, are proposed and tested. Both equalisers can be updated by minimising a hybrid CM/MSE cost function based on the constant modulus (CM) criterion for active users and a mean square error (MSE) criterion for inactive users in a partially loaded system. The BER performance abd the convergence of the proposed algorithms are analysed and compared through various simulations in both partially and fully loaded systems. Essentially, our results show that the VSL algorithm exhibits faster convergence than the MCD scheme while similar BER performance over different multi-path channels is achieved.

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More information

Published date: 2004
Additional Information: Event Dates: June 2-4
Venue - Dates: 2nd International Workshop on Signal Processing for Wireless Communications, Kings' College London, 2004-06-01 - 2004-06-03
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 259414
URI: http://eprints.soton.ac.uk/id/eprint/259414
PURE UUID: 6412cacb-cb78-4103-a44c-48bbfbe46198

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Date deposited: 04 Jun 2004
Last modified: 23 Sep 2020 16:33

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