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中文摘要：
针对正交频分复用（OFDM）中继系统中上行反馈负荷过多和两跳链路能量消耗过大的问题，提出了一种减少系统上行反馈的节能机制（RFSE）。首先，根据用户的反馈中断概率，分别为中继和基站设置反馈门限；然后，通过信道的状态变化动态调整反馈门限，以达到减少系统反馈量的同时保证系统反馈量的稳定。最后，根据中继系统两跳链路中速率不匹配的规律，调整基站和中继处的发射功率，以达到减少系统能耗的目的。仿真结果表明，与减少信道反馈信息分布式调度（RRFD）机制相比较，RFSE 机制在减少系统反馈的同时，不仅保证了系统反馈量的稳定性，而且极大程度地减少了系统能耗。
英文摘要：
In order to reduce uplink feedback and save the two hop link energy consumption in the orthogonal frequency division multiplexing （OFDM）relay system,this paper proposed a reduced uplink feedback and saved energy （RFSE） method.Firstly,set the feedback thresholds for relay and base station based on the probability of user feedback outage. Secondly,adjust the feedback threshold according to the change of channel state,and determine whether feedback the in-formation to base station in order to reduce system feedback and ensure the feedback stabilization.Finally,adjust the trans-mit powers of base station and relay separately to reduce system energy consumption concerning the rate of two-hop relay system.The simulation results show that RFSE algorithm not only reduces system feedback and ensure system feedback sta-bilization,but also greatly reduces energy consumption compared with semi-distributed scheduling scheme which is used to reduce the feedback of channel state information.
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