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.
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
.
DOI: 10.1007/s12204-015-1642-7
[1] Belt B, Khlopin D, Seiffert G. Spectrum policy task force report (ET Docket No. 02-135) [R].Washington, DC: Federal Communications Commission,2002.
[2] Dortch M H. Facilitating opportunities for flexible,efficient, and reliable spectrum use employing cognitive radio technologies (ET Docket No. 03-108) [R].Washington, DC: Federal Communications Commission,2010.
[3] Mitola J, Maguire G Q. Cognitive radio: Making software radios more personal [J]. IEEE Personal Communications, 1999, 6(4): 13-18.
[4] Haykin S. Cognitive radio: Brain-empowered wireless communications [J]. IEEE Journal on Selected Areas in Communications, 2005, 23(2): 201-220.
[5] Joviˇci′c, Viswanath P. Cognitive radio: An information-theoretic perspective [J]. IEEE Transactions on Information Theory, 2009, 55(9): 3945-3958.
[6] Laneman J N, Tse D N C, Wornell G W. Cooperative diversity in wireless networks: Efficient protocols and outage behavior [J]. IEEE Transactions on Information Theory, 2004, 50(12): 3062-3080.
[7] Sendonaris A, Erkip E, Aazhang B. User cooperation diversity. Part I. System description [J]. IEEE Transactions on Communications, 2003, 51(11): 1927-1938.
[8] Shaat M, Bader F. Asymptotically optimal resource allocation in OFDM-based cognitive networks with multiple relays [J]. IEEE Transactions on Wireless Communications, 2012, 11(3): 892-897.
[9] Alsharoa A, Bader F, Alouini M S. Relay selection and resource allocation for two-way DF-AF cognitive radio networks [J]. IEEE Wireless Communications Letters, 2013, 2(4): 427-430.
[10] Li L Y, Zhou X W, Xu H B, et al. Simplified relay selection and power allocation in cooperative cognitive radio systems [J]. IEEE Transactions on Wireless Communications, 2011, 10(1): 33-36.
[11] Lu W D, Gong Y, Ting S H, et al. Cooperative OFDM relaying for opportunistic spectrum sharing: Protocol design and resource allocation[J]. IEEE Transactions on Wireless Communications,2012, 11(6): 2126-2135.
[12] Liu K J R, Sadek A K, Su W F, et al. Cooperative communications and networking [M]. New York:Cambridge University Press, 2009.
