On power control and frequency reuse in the two user cognitive channel

Onur Ozan Koyluoglu, Hesham El Gamal

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This paper considers the generalized cognitive radio channel where the secondary user is allowed to reuse the frequency during both the idle and active periods of the primary user, as long as the primary rate remains the same. In this setting, the optimal power allocation policy with single-input singleoutput (SISO) primary and secondary channels is explored. Interestingly, the offered gain resulting from the frequency reuse during the active periods of the spectrum is shown to disappear in both the low and high signal-to-noise ratio (SNR) regimes. We then argue that this drawback in the high SNR region can be avoided by equipping both the primary and secondary transmitters with multiple antennas. Finally, the scenario consisting of SISO primary and multi-input multi-output (MIMO) secondary channels is investigated. Here, a simple Zero-Forcing approach is shown to significantly outperform the celebrated DecodingForwarding-Dirty Paper Coding strategy (especially in the high SNR regime).

Original languageEnglish (US)
Pages (from-to)3546-3553
Number of pages8
JournalIEEE Transactions on Wireless Communications
Volume8
Issue number7
DOIs
StatePublished - Jul 2009
Externally publishedYes

Fingerprint

Power Control
Power control
Reuse
Signal to noise ratio
Zero-forcing
Multiple Antennas
Cognitive Radio
Power Allocation
Optimal Allocation
Cognitive radio
Transmitter
Transmitters
Coding
Antennas
Scenarios
Output

Keywords

  • Cognitive radios
  • Frequency reuse
  • Multiple antenna systems
  • Power allocation
  • Spectral efficiency

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Applied Mathematics

Cite this

On power control and frequency reuse in the two user cognitive channel. / Koyluoglu, Onur Ozan; El Gamal, Hesham.

In: IEEE Transactions on Wireless Communications, Vol. 8, No. 7, 07.2009, p. 3546-3553.

Research output: Contribution to journalArticle

@article{42a276a145cf4077886ab308c7a027da,
title = "On power control and frequency reuse in the two user cognitive channel",
abstract = "This paper considers the generalized cognitive radio channel where the secondary user is allowed to reuse the frequency during both the idle and active periods of the primary user, as long as the primary rate remains the same. In this setting, the optimal power allocation policy with single-input singleoutput (SISO) primary and secondary channels is explored. Interestingly, the offered gain resulting from the frequency reuse during the active periods of the spectrum is shown to disappear in both the low and high signal-to-noise ratio (SNR) regimes. We then argue that this drawback in the high SNR region can be avoided by equipping both the primary and secondary transmitters with multiple antennas. Finally, the scenario consisting of SISO primary and multi-input multi-output (MIMO) secondary channels is investigated. Here, a simple Zero-Forcing approach is shown to significantly outperform the celebrated DecodingForwarding-Dirty Paper Coding strategy (especially in the high SNR regime).",
keywords = "Cognitive radios, Frequency reuse, Multiple antenna systems, Power allocation, Spectral efficiency",
author = "Koyluoglu, {Onur Ozan} and {El Gamal}, Hesham",
year = "2009",
month = "7",
doi = "10.1109/TWC.2009.071100",
language = "English (US)",
volume = "8",
pages = "3546--3553",
journal = "IEEE Transactions on Wireless Communications",
issn = "1536-1276",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "7",

}

TY - JOUR

T1 - On power control and frequency reuse in the two user cognitive channel

AU - Koyluoglu, Onur Ozan

AU - El Gamal, Hesham

PY - 2009/7

Y1 - 2009/7

N2 - This paper considers the generalized cognitive radio channel where the secondary user is allowed to reuse the frequency during both the idle and active periods of the primary user, as long as the primary rate remains the same. In this setting, the optimal power allocation policy with single-input singleoutput (SISO) primary and secondary channels is explored. Interestingly, the offered gain resulting from the frequency reuse during the active periods of the spectrum is shown to disappear in both the low and high signal-to-noise ratio (SNR) regimes. We then argue that this drawback in the high SNR region can be avoided by equipping both the primary and secondary transmitters with multiple antennas. Finally, the scenario consisting of SISO primary and multi-input multi-output (MIMO) secondary channels is investigated. Here, a simple Zero-Forcing approach is shown to significantly outperform the celebrated DecodingForwarding-Dirty Paper Coding strategy (especially in the high SNR regime).

AB - This paper considers the generalized cognitive radio channel where the secondary user is allowed to reuse the frequency during both the idle and active periods of the primary user, as long as the primary rate remains the same. In this setting, the optimal power allocation policy with single-input singleoutput (SISO) primary and secondary channels is explored. Interestingly, the offered gain resulting from the frequency reuse during the active periods of the spectrum is shown to disappear in both the low and high signal-to-noise ratio (SNR) regimes. We then argue that this drawback in the high SNR region can be avoided by equipping both the primary and secondary transmitters with multiple antennas. Finally, the scenario consisting of SISO primary and multi-input multi-output (MIMO) secondary channels is investigated. Here, a simple Zero-Forcing approach is shown to significantly outperform the celebrated DecodingForwarding-Dirty Paper Coding strategy (especially in the high SNR regime).

KW - Cognitive radios

KW - Frequency reuse

KW - Multiple antenna systems

KW - Power allocation

KW - Spectral efficiency

UR - http://www.scopus.com/inward/record.url?scp=77958054095&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77958054095&partnerID=8YFLogxK

U2 - 10.1109/TWC.2009.071100

DO - 10.1109/TWC.2009.071100

M3 - Article

VL - 8

SP - 3546

EP - 3553

JO - IEEE Transactions on Wireless Communications

JF - IEEE Transactions on Wireless Communications

SN - 1536-1276

IS - 7

ER -