过时CSI下基于HARQ的协作通信能量效率

摘要

Average energy consumption per bit of cooperative communication under outdated CSI was computed and the energy efficiency was improved using error correct codes.Compared with the energy consumption under perfect CSI,the outdated CSI problem causes cooperative communication performance decline,and it gets even worse with the increasing of the outdated level. It is also shown that energy efficiency can be improved using error correcting codes mechanism when end-to-end signal-to-noise ratio at the destination node is within a certain range.Through the analysis of outdated level,the number of cooperative nodes and the correcting ability,factors affecting energy efficiency under outdated CSI in wireless networks are indicated.%研究过时CSI对无线网络能量效率的影响,计算在CSI过时情况下,基于重传机制的放大转发协作通信传输的比特能量消耗,计算加入纠错编码后的能量消耗.研究结果表明,CSI过时会导致协作通信的能量效率降低,且降低的程度随过时程度的加强而加强,在一定的端到端链路信噪比范围内,加入纠错编码能够提高过时CSI情况下的协作通信能量效率.对过时程度、中继节点个数以及纠错能力的分析结果表明了影响网络能量效率的因素.