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# Performance of Multiway Relay DS-CDMA Systems over Nakagami-m Fading Channels

Shi, Jia and Yang, Lie-Liang (2011) Performance of Multiway Relay DS-CDMA Systems over Nakagami-m Fading Channels. IEEE VTC2011 Spring, Budapest, Hungary. 14 - 17 May 2011.

Record type: Conference or Workshop Item (Paper)

## Abstract

A multiway relay direct-sequence code-division multiple-access (MR-DS-CDMA) system is proposed for exchanging information among a group of distributed mobile terminals (MTs). In order to implement information exchange, a MT having similar distances from the other MTs is chosen to act as a relay, which assists the whole group of MTs to achieve their information exchange within two time-slots. In our proposed MR-DS-CDMA system, the relay is operated in detection-and-forward (DF) relaying strategy. Signals at the relay and the MTs are detected in the principles of minimum mean-square error multiuser detection (MMSE-MUD) or of the receiver multiuser diversity assisted multi-stage MMSE MUD (RMD/MS-MMSE MUD). The error performance of the MR-DS-CDMA is investigated, when communicating over Nakagami-$m$ fading channels. Our studies show that the MR-DS-CDMA employing the RMD/MS-MMSE MUD at both the relay and MTs constitutes a high-efficiency information exchange system. It has low delay, promising error performance and low-complexity. Furthermore, it is robust to system overloading, where the number of MTs supported is higher than the spreading factor of the DS-CDMA system.

Text
97-42669.pdf - Other

Published date: May 2011
Additional Information: Event Dates: 15-18 May 2011
Venue - Dates: IEEE VTC2011 Spring, Budapest, Hungary, 2011-05-14 - 2011-05-17
Organisations: Southampton Wireless Group

## Identifiers

Local EPrints ID: 272623
URI: http://eprints.soton.ac.uk/id/eprint/272623
PURE UUID: e8ca6640-75c8-4256-b2e9-34aa3c1a17f1
ORCID for Lie-Liang Yang: orcid.org/0000-0002-2032-9327

## Catalogue record

Date deposited: 05 Aug 2011 10:45

## Contributors

Author: Jia Shi
Author: Lie-Liang Yang