Relay Selection and Power Allocation in Amplify-and-Forward Cognitive Radio Networks: A Special Spectrum Sharing Scheme

doi:10.1007/s12204-015-1642-7

Abstract

Abstract: In this paper, we present a special spectrum sharing scheme that is a joint optimization of relay selection and power allocation at the secondary transmitter, where the primary user is incapable of supporting its target signal-to-noise ratio (SNR). Specifically, the selected secondary transmitter assists the primary user with achieving its target SNR via two-phase cooperative amplify-and-forward relaying. By searching for the candidate secondary transmitters which have already satisfied the primary user’s target SNR, we can select the optimal secondary transmitter. This optimal secondary transmitter not only satisfies the primary user’s target SNR, but also maximizes the throughput of the secondary user. We study this joint optimization problem such that the secondary user’s throughput is maximized under the constraint that satisfies the primary user’s target SNR. Numerical results show that our scheme can maximize the throughput of the secondary user, and can obtain the win-win solution for the primary and secondary systems.

Key words: relay selection| power allocation| amplify-and-forward| spectrum sharing| cognitive radio network

摘要： In this paper, we present a special spectrum sharing scheme that is a joint optimization of relay selection and power allocation at the secondary transmitter, where the primary user is incapable of supporting its target signal-to-noise ratio (SNR). Specifically, the selected secondary transmitter assists the primary user with achieving its target SNR via two-phase cooperative amplify-and-forward relaying. By searching for the candidate secondary transmitters which have already satisfied the primary user’s target SNR, we can select the optimal secondary transmitter. This optimal secondary transmitter not only satisfies the primary user’s target SNR, but also maximizes the throughput of the secondary user. We study this joint optimization problem such that the secondary user’s throughput is maximized under the constraint that satisfies the primary user’s target SNR. Numerical results show that our scheme can maximize the throughput of the secondary user, and can obtain the win-win solution for the primary and secondary systems.

关键词: relay selection| power allocation| amplify-and-forward| spectrum sharing| cognitive radio network

CLC Number:

TN 925.93

ZHAO Da-qian* (赵大骞), PEI Er-rong (裴二荣), ZHANG Zhi-zhong (张治中). Relay Selection and Power Allocation in Amplify-and-Forward Cognitive Radio Networks: A Special Spectrum Sharing Scheme[J]. Journal of shanghai Jiaotong University (Science), 2015, 20(4): 403-407.

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