Energy-efficient subcarrier pairing and power allocation for DF relay networks with an eavesdropper

Keshav Singh, Meng Lin Ku, Sudip Biswas, Tharmalingam Ratnarajah

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Algorithms for joint subcarrier pairing and power allocation are investigated in order to maximize the worst-case energy efficiency (EE) in dual-hop decode-and-forward (DF) relay networks in the presence of an active eavesdropper. Accordingly, we study the impact of number of subcarriers on the trade-off in performance between the EE and the spectrum efficiency (SE). The formulated EE optimization problem is the ratio of the secure SE over the entire power consumption in the network, subject to the constraints of total transmit power and subcarrier pairing. A near-optimal iterative algorithm is proposed to perform the subcarrier pairing and power allocation for achieving the maximum EE in the networks. Furthermore, a suboptimal algorithm is proposed with two-step resource allocation. By considering the subcarrier channel quality of the source-to-relay and relay-to-destination links, the subcarrier pairing is first performed, followed by an energy-efficient iterative power allocation scheme to maximize the EE. Numerical results validate the effectiveness and correctness of the proposed algorithms.

Original languageEnglish
Article number1953
Issue number12
StatePublished - Dec 2017


  • Decode-and-forward
  • Eavesdropper
  • Energy efficiency
  • Power allocation
  • Relay networks
  • Subcarrier pairing


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