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Single-User Performance of Uplink DS-CDMA using Relay-Assisted Diversity

Fang, W, Yang, L-L and Hanzo, L (2006) Single-User Performance of Uplink DS-CDMA using Relay-Assisted Diversity At IEEE PIMRC'06, Finland. 11 - 14 Sep 2006. , pp. 1-5.

Record type: Conference or Workshop Item (Paper)


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 communicatnals 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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Published date: 2006
Additional Information: Event Dates: 11-14 September 2006
Venue - Dates: IEEE PIMRC'06, Finland, 2006-09-11 - 2006-09-14
Organisations: Southampton Wireless Group


Local EPrints ID: 263336
PURE UUID: 63286559-9e7e-42f4-bf68-378f74d3360d
ORCID for L-L Yang: ORCID iD

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Date deposited: 22 Jan 2007
Last modified: 18 Jul 2017 07:46

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Author: W Fang
Author: L-L Yang ORCID iD
Author: L Hanzo

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