Journal of Shanghai University(Natural Science Edition) ›› 2017, Vol. 23 ›› Issue (5): 666-.doi: 10.12066/j.issn.1007-2861.1762

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Energy efficiency of bidirectional amplify-and-forward relay links

CHEN Fangfang, WANG Tao, SUN Yanzan, WU Yating   

  1. Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China
  • Received:2016-01-04 Online:2017-10-30 Published:2017-10-30

Abstract:

In this paper, a three-node relay link with bidirectional data transmission is studied. Power consumption of both baseband and radio frequency circuits is taken into account. With an amplify-and-forward relay system and a given bit error rate, the influence of modulation rate on energy efficiency is analyzed. Minimum transmitted power of the radio freqency circuit is derived. An expression of energy efficiency is obtained for the case that the baseband circuit power is related to the modulation rate. The optimization problem is solved using a mathematical optimization method. The effect of modulation rate on energy efficiency is analyzed, and verified by simulation results.

Key words: amplify-and-forward, modulation rate, energy efficiency