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

Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第2期11卷 139-150页

作者： Guang-xi ZHU Xue-bing PEI Dai-ming QU Jian LIU Qing-ping WANG Gang SU Wuhan National Laboratory for Optoelectronics Department of Electronics & Information Engineering Huazhong University of Science and Technology Wuhan 430074 China

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.

关键词： Bandwidth allocation Power control multi-hop cognitive radio networks Spectrum management Heterogeneous networks

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Joint channel allocation and power control with fairness in multi-hop cognitive radio networks

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High Technology Letters 2015年第3期21卷 315-320页

作者：裴雪兵 Tang Zhenhua China Ship Development and Design Center School of Computer and Electronics Information Guangxi University

This paper investigates channel allocation and cognitive radio networks. The color-sensitive graph power control schemes in OFDM-based multi-hop coloring （CSGC） model is viewed as an efficient solution to the spectrum assignment problem. The model is extended to combine with the power con- trol strategy to avoid interference among secondary users and adapt dynamic topology. The optimiza- tion problem is formulated encompassing the channel allocation and power control with the interfer- ence constrained below a tolerable limit. Meanwhile, the proposed resource allocation scheme takes the fairness of secondary users into account in obtaining the solution of optimization. Numerical re- suits show that the proposed strategy outperforms the existing spectrum assignment algorithms on the performance of both the network throughput and minimum route bandwidth of all routes, as well as the number of connected multi-hop routes which implies the fairness among secondary users.

关键词： channel allocation power control multi-hop cognitive radio networks

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