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CLC number: TN915; TP393

On-line Access: 2010-01-01

Received: 2009-02-10

Revision Accepted: 2009-09-30

Crosschecked: 2009-12-04

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Journal of Zhejiang University SCIENCE C 2010 Vol.11 No.2 P.139-150

http://doi.org/10.1631/jzus.C0910070


Joint bandwidth allocation and power control with interference constraints in multi-hop cognitive radio networks


Author(s):  Guang-xi ZHU, Xue-bing PEI, Dai-ming QU, Jian LIU, Qing-ping WANG, Gang SU

Affiliation(s):  Wuhan National Laboratory for Optoelectronics, Department of Electronics & Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding email(s):   zjupeixb@gmail.com

Key Words:  Bandwidth allocation, Power control, Multi-hop cognitive radio networks, Spectrum management, Heterogeneous networks


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Guang-xi ZHU, Xue-bing PEI, Dai-ming QU, Jian LIU, Qing-ping WANG, Gang SU. Joint bandwidth allocation and power control with interference constraints in multi-hop cognitive radio networks[J]. Journal of Zhejiang University Science C, 2010, 11(2): 139-150.

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author="Guang-xi ZHU, Xue-bing PEI, Dai-ming QU, Jian LIU, Qing-ping WANG, Gang SU",
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volume="11",
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year="2010",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.C0910070"
}

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%T Joint bandwidth allocation and power control with interference constraints in multi-hop cognitive radio networks
%A Guang-xi ZHU
%A Xue-bing PEI
%A Dai-ming QU
%A Jian LIU
%A Qing-ping WANG
%A Gang SU
%J Journal of Zhejiang University SCIENCE C
%V 11
%N 2
%P 139-150
%@ 1869-1951
%D 2010
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.C0910070

TY - JOUR
T1 - Joint bandwidth allocation and power control with interference constraints in multi-hop cognitive radio networks
A1 - Guang-xi ZHU
A1 - Xue-bing PEI
A1 - Dai-ming QU
A1 - Jian LIU
A1 - Qing-ping WANG
A1 - Gang SU
J0 - Journal of Zhejiang University Science C
VL - 11
IS - 2
SP - 139
EP - 150
%@ 1869-1951
Y1 - 2010
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.C0910070


Abstract: 
We investigate the bandwidth allocation and power control schemes in orthogonal frequency division multiplexing (OFDM) based multi-hop cognitive radio networks, and the color-sensitive graph coloring (CSGC) model is viewed as an efficient solution to the spectrum assignment problem. We extend the model by taking into account the power control strategy to avoid interference among secondary users and adapt dynamic topology. We formulate the optimization problem encompassing the channel allocation, power control with the interference constrained below a tolerable limit. The optimization objective with two different optimization strategies focuses on the routes rather than the links as in traditional approaches. A heuristic solution to this nondeterministic polynomial (NP)-hard problem is presented, which performs iterative channel allocation according to the lowest transmission power that guarantees the link connection and makes channel reuse as much as possible, and then the transmission power of each link is maximized to improve the channel capacity by gradually adding power level from the lowest transmission power until all co-channel links cannot satisfy the interference constraints. Numerical results show that our proposed strategies outperform the existing spectrum assignment algorithms in the performance of both the total network bandwidth and minimum route bandwidth of all routes, meanwhile, saving the transmission power.

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