Nam, Young-HanLie, LingjiaMiao, GuowangZhang, Charlie Jianzhong2014-06-132014-06-132011-11-23Nam, 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/10.1186/1687-1499-2011-184https://hdl.handle.net/1808/14061We 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.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.http://creativecommons.org/licenses/by/2.0Corrdinated multipoint receptionsCompEnergy efficiencyArticle10.1186/1687-1499-2011-184openAccess