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Capacity of hybrid cognitive radio networks with distributed VAAs

Title	Capacity of hybrid cognitive radio networks with distributed VAAs
Author	Hong, X., Wang, C.-X., Uysal, Murat, Ge, X., Ouyang, S.
Publication Date:	2010-09
Publication Place	- IEEE
Subject	Capacity analysis, Cognitive radio (CR) network, Multiple-input multiple-output (MIMO), Virtual antenna array VAA
Type	Periodical
Language	English
Digital	Yes
Manuscript	No
Library:	Özyeğin University
Library Asset ID	0018-9545
Record ID	0e92b812-90ac-4da4-8d56-53663e03e932
Library Location	Electrical & Electronics Engineering
Date	2010-09
Notes	Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Sample Text	A cooperative hybrid cognitive radio (CR) network is proposed to simultaneously operate on a dedicated licensed band and a secondary band. The licensed band is used for communications between a base station (BS) and mobile CR users, whereas the secondary band is used to facilitate the licensed band communication by coordinating multiple CR users to form distributed virtual antenna arrays (VAAs). The capacity of the proposed CR network is studied at both the link and system levels. At the link level (single VAA case), we present an amplify-and-forward-based cooperative signaling scheme that employs power control to prevent harmful noise propagation. The resulting virtual multiple-input-multiple-output (MIMO) link capacity is derived and compared with the real MIMO system. At the system level (multiple VAAs case), the system capacity is derived as a function of multiple parameters, including the primary user density, CR user density, primary exclusion region radius, and VAA radius. Under an average interference power constraint, the maximum system capacity is further calculated by solving an optimization problem with adjustable system parameters. Numerical studies reveal that the proposed cooperative hybrid CR network has a fundamental advantage over a pure CR network by being insensitive to the characteristics of the coexisting primary network. This merit, however, relies on a high CR user density and a wide bandwidth of the secondary band.
DOI	10.1109/TVT.2010.2053056
Cilt	59

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Özyeğin University

Capacity of hybrid cognitive radio networks with distributed VAAs

Author Hong, X., Wang, C.-X., Uysal, Murat, Ge, X., Ouyang, S.

Publication Date 2010-09

Publication Place - IEEE

Subject Capacity analysis, Cognitive radio (CR) network, Multiple-input multiple-output (MIMO), Virtual antenna array VAA

Type Periodical

Language English

Digital Yes

Manuscript No

Library Özyeğin University

Library Asset ID 0018-9545

Record ID 0e92b812-90ac-4da4-8d56-53663e03e932

Library Location Electrical & Electronics Engineering

Date 2010-09

Notes Due to copyright restrictions, the access to the full text of this article is only available via subscription.

Sample Text A cooperative hybrid cognitive radio (CR) network is proposed to simultaneously operate on a dedicated licensed band and a secondary band. The licensed band is used for communications between a base station (BS) and mobile CR users, whereas the secondary band is used to facilitate the licensed band communication by coordinating multiple CR users to form distributed virtual antenna arrays (VAAs). The capacity of the proposed CR network is studied at both the link and system levels. At the link level (single VAA case), we present an amplify-and-forward-based cooperative signaling scheme that employs power control to prevent harmful noise propagation. The resulting virtual multiple-input-multiple-output (MIMO) link capacity is derived and compared with the real MIMO system. At the system level (multiple VAAs case), the system capacity is derived as a function of multiple parameters, including the primary user density, CR user density, primary exclusion region radius, and VAA radius. Under an average interference power constraint, the maximum system capacity is further calculated by solving an optimization problem with adjustable system parameters. Numerical studies reveal that the proposed cooperative hybrid CR network has a fundamental advantage over a pure CR network by being insensitive to the characteristics of the coexisting primary network. This merit, however, relies on a high CR user density and a wide bandwidth of the secondary band.

DOI 10.1109/TVT.2010.2053056

Cilt 59