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Slow Frequency Hopping Assisted MC DS-CDMA using Large Area Synchronised Spreading Sequences

Slow Frequency Hopping Assisted MC DS-CDMA using Large Area Synchronised Spreading Sequences
Slow Frequency Hopping Assisted MC DS-CDMA using Large Area Synchronised Spreading Sequences
The family of Multi-Carrier Direct-Sequence CDMA (MC DS- CDMA) systems exhibits numerous attractive properties, which render them attractive candidates for next-generation wireless communications. We demonstrate that spreading codes exhibiting a so-called interference-free window (IFW) are capable of outperforming classic spreading codes, when the interfering multi-user and multipath components arrive within this IFW. The best possible quasi-synchronous timing of the spreading sequences has to be adjusted with the aid of accurate adaptive timing advance control, which has to be significantly more accurate than that used in the lower-bit-rate second-generation GSM system. Fortunately, the IFW duration may be extended with the advent of multi-carrier DS-CDMA proportionately to the number of subcarriers. Hence the resultant MC DS-CDMA system is capable of exhibiting a near-single-user performance without employing a multi-user detector. A deficiency of the resultant system is that the number of spreading codes exhibiting a certain IFW is limited and so is the IFW duration. This contribution sets out to mitigate the above-mentioned shortcomings so that when the users' delays are in the range of the IFW, we separate them with the aid of the unique, user-specific LAS spreading codes. By contrast, when the users roam at a high distance from the base-station and hence their received signal arrive outside the range of the IFW, we separate them using their unique frequency hopping patterns.
125-129
Wei, H
406657e8-8423-46a8-94c3-2f48f2c06e6e
Yang, L-L.
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Wei, H
406657e8-8423-46a8-94c3-2f48f2c06e6e
Yang, L-L.
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1

Wei, H, Yang, L-L. and Hanzo, L. (2005) Slow Frequency Hopping Assisted MC DS-CDMA using Large Area Synchronised Spreading Sequences. IEE 3G and Beyond, Savoy Place, London, United Kingdom. 07 - 09 Nov 2005. pp. 125-129 .

Record type: Conference or Workshop Item (Other)

Abstract

The family of Multi-Carrier Direct-Sequence CDMA (MC DS- CDMA) systems exhibits numerous attractive properties, which render them attractive candidates for next-generation wireless communications. We demonstrate that spreading codes exhibiting a so-called interference-free window (IFW) are capable of outperforming classic spreading codes, when the interfering multi-user and multipath components arrive within this IFW. The best possible quasi-synchronous timing of the spreading sequences has to be adjusted with the aid of accurate adaptive timing advance control, which has to be significantly more accurate than that used in the lower-bit-rate second-generation GSM system. Fortunately, the IFW duration may be extended with the advent of multi-carrier DS-CDMA proportionately to the number of subcarriers. Hence the resultant MC DS-CDMA system is capable of exhibiting a near-single-user performance without employing a multi-user detector. A deficiency of the resultant system is that the number of spreading codes exhibiting a certain IFW is limited and so is the IFW duration. This contribution sets out to mitigate the above-mentioned shortcomings so that when the users' delays are in the range of the IFW, we separate them with the aid of the unique, user-specific LAS spreading codes. By contrast, when the users roam at a high distance from the base-station and hence their received signal arrive outside the range of the IFW, we separate them using their unique frequency hopping patterns.

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More information

Published date: 2005
Additional Information: Event Dates: 7-9 November 2005
Venue - Dates: IEE 3G and Beyond, Savoy Place, London, United Kingdom, 2005-11-07 - 2005-11-09
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 261685
URI: http://eprints.soton.ac.uk/id/eprint/261685
PURE UUID: 71f96830-5f02-4898-ae45-44682a8d50ec
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: 15 Dec 2005
Last modified: 18 Mar 2024 02:49

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Contributors

Author: H Wei
Author: L-L. Yang ORCID iD
Author: L. Hanzo ORCID iD

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