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Asymmetric Cooperation among Wireless Relays with Linear Precoding

Devroye, Natasha; Mehta, Neelesh and Molisch, Andreas LU (2008) In IEEE Transactions on Wireless Communications 7(12). p.5420-5430
Abstract
Wireless relays extend coverage, improve spectral efficiency, and enhance reliability and rates of wireless cellular communication systems. In this work, we introduce the fundamental notion of asymmetric cooperation among cooperating relays in cellular downlinks - different relays are party to different but overlapping knowledge about the messages transmitted from the base station. We argue that asymmetric cooperation arises naturally in most two-phase protocols In which the base station first transmits information to multiple relays that then cooperatively forward the information to the recipient mobile stations in the cell. For a system in which two relays are of the decode-and-forward type and cooperate using linear precoding to... (More)
Wireless relays extend coverage, improve spectral efficiency, and enhance reliability and rates of wireless cellular communication systems. In this work, we introduce the fundamental notion of asymmetric cooperation among cooperating relays in cellular downlinks - different relays are party to different but overlapping knowledge about the messages transmitted from the base station. We argue that asymmetric cooperation arises naturally in most two-phase protocols In which the base station first transmits information to multiple relays that then cooperatively forward the information to the recipient mobile stations in the cell. For a system in which two relays are of the decode-and-forward type and cooperate using linear precoding to communicate with two mobile stations, we formulate the general, but complicated, throughput optimization problem and derive several results that considerably simplify the optimization. We show that under different channel configurations and fairness criteria, asymmetric cooperation is often the throughput-maximizing option. Under typical configurations, a 20-30% throughput enhancement is achieved compared to conventional full-cooperation systems. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
MIMO, SDMA, asymmetry, linear precoding, cooperation, Relays, fading channels
in
IEEE Transactions on Wireless Communications
volume
7
issue
12
pages
5420 - 5430
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000261924100037
  • scopus:58149125157
ISSN
1536-1276
DOI
10.1109/T-WC.2008.071305
language
English
LU publication?
yes
id
9e940478-7a2e-475f-9a4e-283a3ce76b7f (old id 1377069)
date added to LUP
2009-04-24 10:54:09
date last changed
2017-10-22 04:07:34
@article{9e940478-7a2e-475f-9a4e-283a3ce76b7f,
  abstract     = {Wireless relays extend coverage, improve spectral efficiency, and enhance reliability and rates of wireless cellular communication systems. In this work, we introduce the fundamental notion of asymmetric cooperation among cooperating relays in cellular downlinks - different relays are party to different but overlapping knowledge about the messages transmitted from the base station. We argue that asymmetric cooperation arises naturally in most two-phase protocols In which the base station first transmits information to multiple relays that then cooperatively forward the information to the recipient mobile stations in the cell. For a system in which two relays are of the decode-and-forward type and cooperate using linear precoding to communicate with two mobile stations, we formulate the general, but complicated, throughput optimization problem and derive several results that considerably simplify the optimization. We show that under different channel configurations and fairness criteria, asymmetric cooperation is often the throughput-maximizing option. Under typical configurations, a 20-30% throughput enhancement is achieved compared to conventional full-cooperation systems.},
  author       = {Devroye, Natasha and Mehta, Neelesh and Molisch, Andreas},
  issn         = {1536-1276},
  keyword      = {MIMO,SDMA,asymmetry,linear precoding,cooperation,Relays,fading channels},
  language     = {eng},
  number       = {12},
  pages        = {5420--5430},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Wireless Communications},
  title        = {Asymmetric Cooperation among Wireless Relays with Linear Precoding},
  url          = {http://dx.doi.org/10.1109/T-WC.2008.071305},
  volume       = {7},
  year         = {2008},
}