An Efficient Power-Loading Scheme for OFDM-Based Cognitive Radio Systems

Author

Zhang, Yonghong ; Leung, Cyril

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada

Volume

59

Issue

4

fYear

2010

fDate

5/1/2010 12:00:00 AM

Firstpage

1858

Lastpage

1864

Abstract

We study the bit and power-allocation problem for an orthogonal frequency-division multiplexing (OFDM)-based cognitive radio (CR) system in which the spectrum is licensed to a primary user (PU) pair consisting of one transmitter and one receiver. CR pairs (CRPs) may use both active and nonactive PU bands as long as the generated interference powers are within the interference temperature limits of the PUs. The optimal solution and a low-complexity suboptimal solution are proposed. It is found that significant improvements can be achieved compared with systems in which CRPs only use the nonactive PU bands.

Keywords

OFDM modulation; cognitive radio; radio receivers; radio transmitters; radiofrequency interference; CR pairs; OFDM; bit allocation; cognitive radio; interference power; interference temperature limit; nonactive PU bands; orthogonal frequency-division multiplexing; power allocation; power-loading scheme; primary user; receiver; transmitter; Cognitive radio (CR); orthogonal frequency-division multiplexing (OFDM); power allocation; power loading; resource allocation and interference management;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2009.2039154

Filename

5361434