Power allocation in DF relay assisted OFDM cognitive radio networks with outdated CSI

Shashika Biyanwilage; Upul Gunawardana; Ranjith Liyanapathirana

doi:10.1109/ISCIT.2012.6380962

Power allocation in DF relay assisted OFDM cognitive radio networks with outdated CSI

Shashika Biyanwilage, Upul Gunawardana, Ranjith Liyanapathirana

Research output: Chapter in Book / Conference Paper › Conference Paper › peer-review

4 Citations (Scopus)

Abstract

In this paper, we investigate power allocation in decode-and-forward (DF) relay assisted OFDM cognitive radio (CR) networks. The objective is to maximize the instantaneous capacity of the CR system. Due to channel feedback delay, the available channel state information (CSI) between the secondary and primary users is considered as an outdated but correlated version of the actual instantaneous CSI. An optimal power allocation scheme is presented assuming that the primary users are subject to average interference constraints and the CR transmitters are subject to maximum transmit power constraint. In addition, a suboptimal scheme with reduced complexity is also proposed. Numerical results confirm that the proposed suboptimal power allocation scheme can be used as a less complex alternative for optimal power allocation with some degradation in capacity.

Original language	English
Title of host publication	Proceedings of the 2012 International Symposium on Communications and Information Technologies (ISCIT), 2-5 October 2012, Gold Coast, Qld.
Publisher	IEEE
Pages	561-566
Number of pages	6
ISBN (Print)	9781467311571
DOIs	https://doi.org/10.1109/ISCIT.2012.6380962
Publication status	Published - 2012
Event	International Symposium on Communications and Information Technologies - Duration: 2 Oct 2012 → …

Conference

Conference	International Symposium on Communications and Information Technologies
Period	2/10/12 → …

Keywords

channel state information
cognitive radio
orthogonal frequency division multiplexing
radio transmitters
radiofrequency interference
wireless communication systems

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10.1109/ISCIT.2012.6380962

Cite this

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title = "Power allocation in DF relay assisted OFDM cognitive radio networks with outdated CSI",

abstract = "In this paper, we investigate power allocation in decode-and-forward (DF) relay assisted OFDM cognitive radio (CR) networks. The objective is to maximize the instantaneous capacity of the CR system. Due to channel feedback delay, the available channel state information (CSI) between the secondary and primary users is considered as an outdated but correlated version of the actual instantaneous CSI. An optimal power allocation scheme is presented assuming that the primary users are subject to average interference constraints and the CR transmitters are subject to maximum transmit power constraint. In addition, a suboptimal scheme with reduced complexity is also proposed. Numerical results confirm that the proposed suboptimal power allocation scheme can be used as a less complex alternative for optimal power allocation with some degradation in capacity.",

keywords = "channel state information, cognitive radio, orthogonal frequency division multiplexing, radio transmitters, radiofrequency interference, wireless communication systems",

author = "Shashika Biyanwilage and Upul Gunawardana and Ranjith Liyanapathirana",

year = "2012",

doi = "10.1109/ISCIT.2012.6380962",

language = "English",

isbn = "9781467311571",

pages = "561--566",

booktitle = "Proceedings of the 2012 International Symposium on Communications and Information Technologies (ISCIT), 2-5 October 2012, Gold Coast, Qld.",

publisher = "IEEE",

note = "International Symposium on Communications and Information Technologies ; Conference date: 02-10-2012",

}

Biyanwilage, S, Gunawardana, U & Liyanapathirana, R 2012, Power allocation in DF relay assisted OFDM cognitive radio networks with outdated CSI. in Proceedings of the 2012 International Symposium on Communications and Information Technologies (ISCIT), 2-5 October 2012, Gold Coast, Qld.. IEEE, pp. 561-566, International Symposium on Communications and Information Technologies, 2/10/12. https://doi.org/10.1109/ISCIT.2012.6380962

Power allocation in DF relay assisted OFDM cognitive radio networks with outdated CSI. / Biyanwilage, Shashika; Gunawardana, Upul ; Liyanapathirana, Ranjith.
Proceedings of the 2012 International Symposium on Communications and Information Technologies (ISCIT), 2-5 October 2012, Gold Coast, Qld.. IEEE, 2012. p. 561-566.

Research output: Chapter in Book / Conference Paper › Conference Paper › peer-review

TY - GEN

T1 - Power allocation in DF relay assisted OFDM cognitive radio networks with outdated CSI

AU - Biyanwilage, Shashika

AU - Gunawardana, Upul

AU - Liyanapathirana, Ranjith

PY - 2012

Y1 - 2012

N2 - In this paper, we investigate power allocation in decode-and-forward (DF) relay assisted OFDM cognitive radio (CR) networks. The objective is to maximize the instantaneous capacity of the CR system. Due to channel feedback delay, the available channel state information (CSI) between the secondary and primary users is considered as an outdated but correlated version of the actual instantaneous CSI. An optimal power allocation scheme is presented assuming that the primary users are subject to average interference constraints and the CR transmitters are subject to maximum transmit power constraint. In addition, a suboptimal scheme with reduced complexity is also proposed. Numerical results confirm that the proposed suboptimal power allocation scheme can be used as a less complex alternative for optimal power allocation with some degradation in capacity.

AB - In this paper, we investigate power allocation in decode-and-forward (DF) relay assisted OFDM cognitive radio (CR) networks. The objective is to maximize the instantaneous capacity of the CR system. Due to channel feedback delay, the available channel state information (CSI) between the secondary and primary users is considered as an outdated but correlated version of the actual instantaneous CSI. An optimal power allocation scheme is presented assuming that the primary users are subject to average interference constraints and the CR transmitters are subject to maximum transmit power constraint. In addition, a suboptimal scheme with reduced complexity is also proposed. Numerical results confirm that the proposed suboptimal power allocation scheme can be used as a less complex alternative for optimal power allocation with some degradation in capacity.

KW - channel state information

KW - cognitive radio

KW - orthogonal frequency division multiplexing

KW - radio transmitters

KW - radiofrequency interference

KW - wireless communication systems

UR - http://handle.uws.edu.au:8081/1959.7/520839

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DO - 10.1109/ISCIT.2012.6380962

M3 - Conference Paper

SN - 9781467311571

SP - 561

EP - 566

BT - Proceedings of the 2012 International Symposium on Communications and Information Technologies (ISCIT), 2-5 October 2012, Gold Coast, Qld.

PB - IEEE

T2 - International Symposium on Communications and Information Technologies

Y2 - 2 October 2012

ER -

Power allocation in DF relay assisted OFDM cognitive radio networks with outdated CSI

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