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.
Highlights
Spectral efficiency and energy efficiency are important metrics for wireless communication systems
To model typical implementation of Coordinated multi-point (CoMP) in the cellular network, we first considered a scenario where only a subset of base stations participate in the cooperative link adaptation and cooperative decoding for a single UE, in which case, the other UEs’ signals intended to the other base stations in the network interfere with the single user equipment (UE’s) uplink signals, and the CSI experienced during the actual transmission is different from the CSI used for link adaptation
We found that the maximum energy efficiency of the link adaptation controller is achieved when no rate back-off is employed, when a certain condition is satisfied
Summary
Spectral efficiency and energy efficiency are important metrics for wireless communication systems. In the second part of the article, we analyze the optimal energy efficiency of a CoMP reception scheme of multiple UEs’ uplink transmission in a cellular network, where all the base stations participate in the cooperative decoding. In this interference-free scenario, we assume that perfect CSI is available at the link adaptation controller and analyzes conditions for achieving the optimal energy efficiency.
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