基于动态SNR门限的CoMP反馈开销优化

Optimization of CoMP Feedback Overhead Based on Dynamic SNR Threshold

多点协作(CoMP)系统需要用户反馈大量的信道信息,以满足系统的性能增益,但系统的能耗会随着反馈开销的提升而增大。为此,设计基于动态SNR门限的反馈算法,从绿色无线系统的观点出发,尽量降低系统的性能损失,并通过减少不必要的反馈信息,避免协作节点间不必要的交互信息,在系统性能和能耗之间取得较好平衡,提高系统的能量效率。仿真结果表明,与固定SNR门限反馈算法和不采用选择性反馈的情况相比,该算法能在满足系统性能要求的前提下,有效降低系统的反馈开销,实现降低系统能耗的目标。

In order to meet the system performance gain,CoMP system requires users to feedback a lot of the channel information. However,the energy consumption of the system also increases with the enhancement of feedback overhead.Feedback alogorithm based on dynamic SNR threshold is proposed in this paper,starting from the view of the green wireless system,achieves a good compromise between system performance and energy consumption under the premise of minimizing the performance loss to the system by reducing unnecessary feedback information,thereby reducing unnecessary cooperative interactive information between nodes,thus improve the energy efficiency of the system.Simulation results show that the proposed alogorithm can effectively reduce the feedback overhead of system compared with the fixed threshold SNR feedback alogorithm and situation which does not use selective feedback,under the system performance requirements.