Network Performance of Asynchronous UTRA-like FDD/CDMA Systems using Loosely Synchronised Spreading Codes
Network Performance of Asynchronous UTRA-like FDD/CDMA Systems using Loosely Synchronised Spreading Codes
In this paper we characterize the capacity of a UTRA-like Frquency Division Duplex (FDD) Code Division Multiple Access (CDMA) system employing Loosely Synchronized (LS) spreading codes. Current CDMA systems are interference limited, suffering from Inter-Symbol-Interference (ISI), since the orthogonality of the spreading sequences is destroyed by the channel. They also suffer from Multiple-Access-Interference (MAI) owing to the non-zero cross-correlations of the spreading codes. LS codes exhibit a so-called Interference Free Window (IFW) , where both the auto-correlation and cross-correlation of the codes become zero. Therefore LS codes have the promise of mitigating the effects of both ISI and MAI in time dispersive channels. Hence, LS codes have the potential of increasing the capacity of CDMA networks. This contribution studies the achievable network performance by simulation and compares it to that of a UTRA-like FDD/CDMA system using Orthogonal Variable Rate Spreading Factor (OVSF) codes.
Ni, S.
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Hua, W.
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Blogh, J.S.
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Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
2003
Ni, S.
c17ef5a0-a786-46ea-8c68-2cddc3c6a9fc
Hua, W.
231c29f0-f398-468c-bdd6-d1b61e8c7cab
Blogh, J.S.
ddd94f26-9ce5-45cd-801e-eed0531aa3c5
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Ni, S., Hua, W., Blogh, J.S. and Hanzo, L.
(2003)
Network Performance of Asynchronous UTRA-like FDD/CDMA Systems using Loosely Synchronised Spreading Codes.
of VTC'2003 (Fall), Orlando, Florida, United States.
06 - 09 Oct 2003.
Record type:
Conference or Workshop Item
(Paper)
Abstract
In this paper we characterize the capacity of a UTRA-like Frquency Division Duplex (FDD) Code Division Multiple Access (CDMA) system employing Loosely Synchronized (LS) spreading codes. Current CDMA systems are interference limited, suffering from Inter-Symbol-Interference (ISI), since the orthogonality of the spreading sequences is destroyed by the channel. They also suffer from Multiple-Access-Interference (MAI) owing to the non-zero cross-correlations of the spreading codes. LS codes exhibit a so-called Interference Free Window (IFW) , where both the auto-correlation and cross-correlation of the codes become zero. Therefore LS codes have the promise of mitigating the effects of both ISI and MAI in time dispersive channels. Hence, LS codes have the potential of increasing the capacity of CDMA networks. This contribution studies the achievable network performance by simulation and compares it to that of a UTRA-like FDD/CDMA system using Orthogonal Variable Rate Spreading Factor (OVSF) codes.
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sn-hw-jsb-lh-vtc03fall.pdf
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Published date: 2003
Additional Information:
CD-Rom 03P_01 Event Dates: 6-9 October 2003
Venue - Dates:
of VTC'2003 (Fall), Orlando, Florida, United States, 2003-10-06 - 2003-10-09
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 258424
URI: http://eprints.soton.ac.uk/id/eprint/258424
PURE UUID: f6067025-d21d-4919-9276-f4c59360bacb
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Date deposited: 29 Oct 2003
Last modified: 18 Mar 2024 02:33
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Contributors
Author:
S. Ni
Author:
W. Hua
Author:
J.S. Blogh
Author:
L. Hanzo
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