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Energy and Spectral-Efficiency Tradeoff in Downlink OFDMA Networks

Energy and Spectral-Efficiency Tradeoff in Downlink OFDMA Networks,10.1109/icc.2011.5962777,Cong Xiong,Geoffrey Ye Li,Shunqing Zhang,Yan Chen,Shugong

Energy and Spectral-Efficiency Tradeoff in Downlink OFDMA Networks  
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Conventional design of wireless networks mainly focuses on system capacity and spectral efficiency (SE). As green radio (GR) becomes an inevitable trend, energy-efficient design in wireless networks is becoming more and more important. In this paper, the fundamental relation between energy efficiency (EE) and SE in downlinkorthogonal frequency division multiple access (OFDMA) networks is addressed. We first set up a general EE-SE tradeoff framework, where the overall EE, SE and per- user quality-of-service (QoS) are all considered, and prove that EE is strictly quasiconcave in SE. We also find a tight upper bound and a tight lower bound on the EE-SE curve for general scenarios, which reflect the actual EE-SE relation. We then focus on a special case that priority and fairness are considered and develop a low-complexity but near-optimal resource allocation algorithm for practical application of the EE-SE tradeoff. Numer- ical results corroborate the theoretical findings and demonstrate the effectiveness of the proposed resource allocation scheme for achieving a flexible and desirable tradeoff between EE and SE. Index Terms—Energy efficiency (EE), green radio (GR), or- thogonal frequency division multiple access (OFDMA), spectral efficiency (SE)
Published in 2011.
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