Single-User Performance of Uplink DS-CDMA using Relay-Assisted Diversity
Single-User Performance of Uplink DS-CDMA using Relay-Assisted Diversity
In a wireless system with distributed mobile users, several mobile users may cooperate with each other in order to achieve the transmit diversity. In this contribution we investigate the single-user performance of an uplink direct-sequence code-division multiple-access (DS-CDMA) scheme, where one user is assisted by several other users (relays) so as to achieve the relay-assisted diversity. Specifically, the performance of the relay-assisted DS-CDMA is investigated, when communications from the transmitter to the relays and that from the relays to the base-station (BS) receiver may experience different fading. In our study two types of detection schemes are invoked. The first detection scheme is a maximal ratio combining (MRC) assisted single-user detection (SUD) scheme, which maximizes the output signal-to-noise ratio (SNR) without taking the interference among the relays into account. By contrast, the second, detection scheme maximizes the output signal-to-interference-plus-noise ratio (MSINR), which is a multiuser detection (MUD) scheme that is capable of suppressing the interference among the relays. Our study and results show that, in a relay-assisted DS-CDMA without using orthogonal spreading codes, the relay-assisted diversity may only be achievable after suppressing the inter-relay interference.
1-5
Fang, W
60f926e9-d245-4076-92eb-979503bcbf2c
Yang, L-L
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
2006
Fang, W
60f926e9-d245-4076-92eb-979503bcbf2c
Yang, L-L
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Fang, W, Yang, L-L and Hanzo, L
(2006)
Single-User Performance of Uplink DS-CDMA using Relay-Assisted Diversity.
IEEE PIMRC'06, Helsinki, Finland.
11 - 14 Sep 2006.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
In a wireless system with distributed mobile users, several mobile users may cooperate with each other in order to achieve the transmit diversity. In this contribution we investigate the single-user performance of an uplink direct-sequence code-division multiple-access (DS-CDMA) scheme, where one user is assisted by several other users (relays) so as to achieve the relay-assisted diversity. Specifically, the performance of the relay-assisted DS-CDMA is investigated, when communications from the transmitter to the relays and that from the relays to the base-station (BS) receiver may experience different fading. In our study two types of detection schemes are invoked. The first detection scheme is a maximal ratio combining (MRC) assisted single-user detection (SUD) scheme, which maximizes the output signal-to-noise ratio (SNR) without taking the interference among the relays into account. By contrast, the second, detection scheme maximizes the output signal-to-interference-plus-noise ratio (MSINR), which is a multiuser detection (MUD) scheme that is capable of suppressing the interference among the relays. Our study and results show that, in a relay-assisted DS-CDMA without using orthogonal spreading codes, the relay-assisted diversity may only be achievable after suppressing the inter-relay interference.
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PIMRC-2006-1-04022449.pdf
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Published date: 2006
Additional Information:
Event Dates: 11-14 September 2006
Venue - Dates:
IEEE PIMRC'06, Helsinki, Finland, 2006-09-11 - 2006-09-14
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 263336
URI: http://eprints.soton.ac.uk/id/eprint/263336
PURE UUID: 63286559-9e7e-42f4-bf68-378f74d3360d
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Date deposited: 22 Jan 2007
Last modified: 18 Mar 2024 02:49
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Contributors
Author:
W Fang
Author:
L-L Yang
Author:
L Hanzo
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