Energy-Efficient Design for Relay-Aided MIMO-OFDM Cognitive Radio Networks

Authors

  • Bin Wu School of Information Science and Engineering, Southeast University, Nanjing, 210096, China
  • Jiakuo Zuo School of Information Science and Engineering, Southeast University, Nanjing, 210096, China
  • Li Zhao School of Information Science and Engineering, Southeast University, Nanjing, 210096, China
  • Cairong Zou School of Information Science and Engineering, Southeast University, Nanjing, 210096, China

Keywords:

cognitive radio, power allocation, MIMO, relay, fractional programming

Abstract

With the explosive growth of high-rate multimedia services and promptly boomed energy consumption in wireless networks, energy-efficient design is become more and more important. In this paper, we investigate energy-efficient design for relay-aided multiple-input multiple-output-orthogonal frequency division multiplexing (MIMO-OFDM) cognitive radio networks. We formulate an energy-efficient power allocation problem, which takes a form of nonlinear fractional programming. To solve the problem, we first make a joint concave approximation to the original problem which facilitates the optimal algorithm development. Then, we derive an equivalent parametric optimization problem of the approximated problem. Finally, an iteration energy-efficient power allocation algorithm is presented. Numerical results reveal that the proposed algorithm can improve energy efficiency over traditional capacity maximization method.

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Published

2014-11-17

Issue

Vol. 10 No. 1 (2015): International Journal of Computers Communications & Control (February)

Section

Articles

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