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Interference-Free Broadband Single- and Multi-Carrier DS-CDMA

Interference-Free Broadband Single- and Multi-Carrier DS-CDMA
Interference-Free Broadband Single- and Multi-Carrier DS-CDMA
The choice of the direct sequence spreading code in DS-CDMA predetermines the properties of the system. This contribution demonstrates that the family of codes exhibiting an interference-free window (IFW) outperforms classic spreading codes, provided that the interfering multi-user and multipath components arrive within this IFW, which may be ensured with the aid of quasi-synchronous adaptive timing advance control. It is demonstrated that the IFW duration may be extended with the advent of multicarrier DS-CDMA proportionately to the number of subcarriers. Hence, the resultant MC DS-CDMA system is capable of exhibiting nearsingle-user performance without employing a multi-user detector. A limitation of the system is that the number of spreading codes exhibiting a certain IFW is limited, although this problem may be mitigated with the aid of novel code design principles.
68-73
Hua, W.
231c29f0-f398-468c-bdd6-d1b61e8c7cab
Yang, L-L.
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Hua, W.
231c29f0-f398-468c-bdd6-d1b61e8c7cab
Yang, L-L.
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1

Hua, W., Yang, L-L. and Hanzo, L. (2005) Interference-Free Broadband Single- and Multi-Carrier DS-CDMA. IEEE Communications Magazine, 43 (2), 68-73.

Record type: Article

Abstract

The choice of the direct sequence spreading code in DS-CDMA predetermines the properties of the system. This contribution demonstrates that the family of codes exhibiting an interference-free window (IFW) outperforms classic spreading codes, provided that the interfering multi-user and multipath components arrive within this IFW, which may be ensured with the aid of quasi-synchronous adaptive timing advance control. It is demonstrated that the IFW duration may be extended with the advent of multicarrier DS-CDMA proportionately to the number of subcarriers. Hence, the resultant MC DS-CDMA system is capable of exhibiting nearsingle-user performance without employing a multi-user detector. A limitation of the system is that the number of spreading codes exhibiting a certain IFW is limited, although this problem may be mitigated with the aid of novel code design principles.

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More information

Published date: February 2005
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 261653
URI: http://eprints.soton.ac.uk/id/eprint/261653
PURE UUID: 2a09b21c-745d-481d-8fd3-69ae6ec2a527
ORCID for L-L. Yang: ORCID iD orcid.org/0000-0002-2032-9327
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 13 Dec 2005
Last modified: 18 Mar 2024 02:49

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Contributors

Author: W. Hua
Author: L-L. Yang ORCID iD
Author: L. Hanzo ORCID iD

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