Resource allocation in an OFDM-based cognitive radio system

Author

Zhang, Yonghong ; Leung, Cyril

Author_Institution

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

Volume

57

Issue

7

fYear

2009

fDate

7/1/2009 12:00:00 AM

Firstpage

1928

Lastpage

1931

Abstract

The problem of subcarrier, bit and power allocation for an OFDM based cognitive radio system in which one or more spectrum holes exist between multiple primary user (PU) frequency bands is studied. The cognitive radio user is able to use any portion of the frequency band as long as it does not interfere unduly with the PUs´ transmissions. We formulate the resource allocation as a multidimensional knapsack problem and propose a low-complexity, greedy max-min algorithm to solve it. The proposed algorithm is simple to implement and simulation results show that its performance is very close to (within 0.3% of) the optimal solution.

Keywords

OFDM modulation; cognitive radio; computational complexity; greedy algorithms; OFDM-based cognitive radio system; bit allocation; greedy max-min algorithm; low-complexity algorithm; orthogonal frequency division multiplexing; power allocation; primary user frequency band; resource allocation; subcarrier allocation; Bandwidth; Chromium; Cognitive radio; Interference; Multidimensional systems; OFDM modulation; Radio spectrum management; Radio transmitters; Resource management; Wireless networks; Cognitive radio, OFDM, resource allocation, multidimensional 0-1 knapsack problem;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2009.07.070157

Filename

5165384