Opportunistic relay selection with outdated csi: Outage probability and diversity analysis

Jose Lopez Vicario; Albert Bel Bel; Jose A. Lopez-Salcedo; Gonzalo Seco

doi:https://doi.org/10.1109/TWC.2009.081561

Opportunistic relay selection with outdated csi: Outage probability and diversity analysis

Jose Lopez Vicario, Albert Bel Bel, Jose A. Lopez-Salcedo, Gonzalo Seco

Department of Telecommunications and Systems Engineering

Research output: Contribution to journal › Article › Research › peer-review

212 Citations (Scopus)

Abstract

In this paper, we analyze the outage probability and diversity order of opportunistic relay selection in a scenario based on decode and forward and where the available channel state information (CSI) is outdated. The study is conducted analytically by obtaining a closed-form expression for the outage probability, which is defined as the probability that the instantaneous capacity is below a target value. We derive high-SNR approximations for the outage probability. By doing so, we demonstrate that the diversity order of the system is reduced to 1 when CSI is outdated, being this behavior independent of the level of CSI accuracy. A physical explanation for this extreme loss of diversity is provided along with numerical results to support the analytical study. © 2006 IEEE.

Original language	English
Article number	5089967
Pages (from-to)	2872-2876
Journal	IEEE Transactions on Wireless Communications
Volume	8
DOIs	https://doi.org/10.1109/TWC.2009.081561
Publication status	Published - 1 Jun 2009

Keywords

Cooperative communications
Diversity gain
Opportunistic relay selection
Outdated CSI

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title = "Opportunistic relay selection with outdated csi: Outage probability and diversity analysis",

abstract = "In this paper, we analyze the outage probability and diversity order of opportunistic relay selection in a scenario based on decode and forward and where the available channel state information (CSI) is outdated. The study is conducted analytically by obtaining a closed-form expression for the outage probability, which is defined as the probability that the instantaneous capacity is below a target value. We derive high-SNR approximations for the outage probability. By doing so, we demonstrate that the diversity order of the system is reduced to 1 when CSI is outdated, being this behavior independent of the level of CSI accuracy. A physical explanation for this extreme loss of diversity is provided along with numerical results to support the analytical study. {\textcopyright} 2006 IEEE.",

keywords = "Cooperative communications, Diversity gain, Opportunistic relay selection, Outdated CSI",

author = "Vicario, {Jose Lopez} and Bel, {Albert Bel} and Lopez-Salcedo, {Jose A.} and Gonzalo Seco",

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AU - Seco, Gonzalo

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AB - In this paper, we analyze the outage probability and diversity order of opportunistic relay selection in a scenario based on decode and forward and where the available channel state information (CSI) is outdated. The study is conducted analytically by obtaining a closed-form expression for the outage probability, which is defined as the probability that the instantaneous capacity is below a target value. We derive high-SNR approximations for the outage probability. By doing so, we demonstrate that the diversity order of the system is reduced to 1 when CSI is outdated, being this behavior independent of the level of CSI accuracy. A physical explanation for this extreme loss of diversity is provided along with numerical results to support the analytical study. © 2006 IEEE.

KW - Cooperative communications

KW - Diversity gain

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