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http://dx.doi.org/10.7236/JIIBC.2018.18.5.69

Performance of Cooperative NOMA Systems with Cognitive User Relay  

Kim, Nam-Soo (Dept. of Electronic Engineering, Cheongju University)
Publication Information
The Journal of the Institute of Internet, Broadcasting and Communication / v.18, no.5, 2018 , pp. 69-75 More about this Journal
Abstract
Recently, Non-orthogonal multiple access (NOMA) has been focused for the next generation multiple access, which has more spectral efficiency under the limited spectrum bandwidth. Moreover, the spectrum efficiency can be improved by cognitive radio in which the unlicensed secondary users can access the spectrum that is used by the licensed primary user under the limited interference. Hence, we consider the combination of NOMA and cognitive radio, and derive the performance of the cognitive cooperative NOMA system. For the cooperation, a relay is selected among near users, and the selection combining is assumed at a far user. The outage probability of the selected relay and the far user is derived in closed-form, respectively. The provided numerical results are matched well with the Monte Carlo simulation. Numerical results showed that the performance of the relay is affected from the power allocation coefficient, the minimum outage probability is observed at 0.86 of the power allocation coefficient for far user under the given conditions. More than 15 dB of signal-to-noise ratio is required to meet the outage probability of $1{\times}10^{-13}$ for the far user with the frequency acquisition probability of 0.5 compared to that of 1. It shows that the performance of the far user is very sensitive to the acquisition probability of the cognitive relay.
Keywords
Cognitive radio; cooperative NOMA; user relay; selection combining;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Y.Saito, Y. Kishiyama, and A. Benjebbour, "Non-orthogonal multiple access (NOMA) for cellular future radio access," Proc. of Veh. Tech. Conf. (VTC spring), pp. 1-5, June 2013.
2 L. Dai, B. Wang, Y. Yuan, S. Han, C.-L. I, and Z. Wang, "Non-orthogonal multiple access for 5G: solutions, challenges, opportunities, and future research trends," IEEE Communications Magazine, Vol.53, No.9, pp.74-81, Sep. 2015.   DOI
3 Y. Saito, A. Benjebbour, Y. Kishiyama, and T. Nakamura, "System-level performance evaluation of downlink non-orthogonal multiple access (NOMA)," Proc. of Annual Int. Sym. on Personal, Indoor, and Mobile Radio Communications (PIMRC), pp. 611-615, Sept. 2013.
4 P. Xu, Z. Yang, Z. Ding, and Z. Zhang, "Optimal relay selection schemes for cooperative NOMA," IEEE Trans. on Vehicular Technology, to be appear in April 2018.
5 Z. Ding, H. Dai, H. V. Poor, "Relay selection for cooperative NOMA," IEEE Wireless Communications Letters, Vol.5, No.4, pp.416-419, 2016.   DOI
6 Z. Ding, M. Peng, and H. V. Poor, "Cooperative non-orthogonal multiple access in 5G systems," IEEE Communications Letters, Vol.19, No.8, pp. 1462-1465, June 2015.   DOI
7 Y. Liu, Z. Ding, M. Elkashlan, and H. V.Poor, "Cooperative non-orthogonal multiple access with simultaneous wireless information and power transfer," IEEE Journal on Selected Areas in Communications, Vol.34, No.4, pp.938-953, March 2016.   DOI
8 N.-S. Kim, "Utilization of max-min user relay in cooperative NOMA systems," Journal of Telecommunications, Electronic and Computer Engineering, Vol.10, No.1-4, pp.89-94, March 2018.
9 S. Haykin, "Cognitive radio: brain-empowered wireless communications," IEEE Journal on Selected Areas in Communications, Vol.23, No.2, pp.201-220, Feb. 2005.   DOI
10 A. Ghasemi and E. Sousa, "Spectrum sensing in cognitive radio networks: requirements, challenges and design trade-offs," IEEE Communications Magazine, Vol.46, No.5, pp.32-39, April 2008.   DOI
11 K. Lee and A. Yener, "Outage performance of cognitive wireless relay networks," Proc. of Globecom, pp.1-5, Nov. 2006.
12 Y. Liu, Z. Ding, M. Elkashlan, and J. Yuan, "Non-orthogonal multiple access in large-scale underlay cognitive radio networks," IEEE Tr. On Vehicular Technology, Vol.65, No.12, pp.10152- 10157, Dec. 2016.   DOI
13 M. Zeng, G. I. Tsiropoulos, O. A. Dobre, and M. H. Ahmed, "Power allocation for cognitive radio networks employing non-orthogonal multiple access," Proc. of GLOCOM, pp. 1-5, Feb. 2016.
14 L. Lv, J. Chen, and Q. Ni, "Cooperative non-orthogonal multiple access in cognitive radio," IEEE Communications Letters, Vol.20, No.10, pp.2059-2062, Oct. 2016.   DOI
15 N.-S Kim, "Optimum power allocation of cooperative NOMA systems based on user relay," Journal of The Institute of Internet, Broadcasting and Communication, Vol. 17, No. 5, pp.25-33, Oct. 2017.   DOI
16 H. Saraweera, P. Smith, and N. Surobhi, "Exact outage probability of cooperative diversity with opportunistic spectrum access," Proc. of International Conf. on Commu. Workshops(ICC), pp.79-84, May 2008.