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Link adaptation for energy-efficient uplink coordinated multi-point receptions
Nam, Young-Han Lie, Lingjia Miao, Guowang Zhang, Charlie Jianzhong
Nam, Young-Han
Lie, Lingjia
Miao, Guowang
Zhang, Charlie Jianzhong
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Abstract
We investigate link adaptation methods for energy-efficient uplink coordinated multi-point receptions. A system model for practical cellular networks is introduced, in which only a subset of base stations participates in cooperative link adaptation and cooperative decoding for uplink transmissions. To cope with channel-state-information (CSI) mismatch incurred from the system model, link adaptation controllers implementing rate back-off from the maximum achievable rate calculated with the mismatched CSI is introduced. From analytical and simulation results, it is concluded that under a certain condition, the rate back-off does not help to improve energy efficiency, where, for example, the condition holds when the CSI errors are modeled as additive Gaussian random variables. Furthermore, energy efficiency of multi-user spatial-division-multiple-access uplink transmissions is studied in isolated cooperative cellular networks. In this scenario, an analytical expression for the optimal link adaptation achieving maximum energy efficiency is obtained.
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Date
2011-11-23
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Publisher
Springer
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Keywords
Corrdinated multipoint receptions, Comp, Energy efficiency
Citation
Nam, Young-Han; Lingjia Liu, Guowang Miao and Charlie Jianzhong Zhang "Link adaptation for energy-efficient uplink coordinated multi-point receptions." EURASIP Journal on Wireless Communications and Networking 2011, 2011:184. http://dx.doi.org/10.1186/1687-1499-2011-184