• KSII Transactions on Internet and Information Systems
    Monthly Online Journal (eISSN: 1976-7277)

Optimal Power Allocation and Relay Selection for Cognitive Relay Networks using Non-orthogonal Cooperative Protocol


Abstract

In this paper, we investigate joint power allocation and relay selection (PARS) schemes in non-orthogonal cooperative protocol (NOCP) based cognitive relay networks. Generally, NOCP outperforms the orthogonal cooperative protocol (OCP), since it can provide more transmit diversity. However, most existing PARS schemes in cognitive relay networks focus on OCP, which are not suitable for NOCP. In the context of NOCP, we first derive the joint constraints of transmit power limit for secondary user (SU) and interference constraint for primary user (PU). Then we formulate optimization problems under the aforementioned constraints to maximize the capacity of SU in amplify-and-forward (AF) and decode-and-forward (DF) modes, respectively. Correspondingly, we derive the closed form solutions with respect to different parameters. Numerical results are provided to verify the performance improvement of the proposed PARS schemes.


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Cite this article

[IEEE Style]
Peng Lan, Lizhen Chen1, Guowei Zhang and Fenggang Sun, "Optimal Power Allocation and Relay Selection for Cognitive Relay Networks using Non-orthogonal Cooperative Protocol," KSII Transactions on Internet and Information Systems, vol. 10, no. 5, pp. 2047-2066, 2016. DOI: 10.3837/tiis.2016.05.006

[ACM Style]
Lan, P., Chen1, L., Zhang, G., and Sun, F. 2016. Optimal Power Allocation and Relay Selection for Cognitive Relay Networks using Non-orthogonal Cooperative Protocol. KSII Transactions on Internet and Information Systems, 10, 5, (2016), 2047-2066. DOI: 10.3837/tiis.2016.05.006