基于干扰抑制的上行多基站协作能效算法

Uplink multi-base cooperative energy efficiency algorithm based on interference rejection

针对上行链路多基站协作通信系统中联合处理功耗过高的问题,提出了一种基于小区间干扰抑制的上行多基站协作能效算法(ICIR-UMBCEEA)。首先,通过解码参考信号(DMRS)序列得到等效噪声和协作多点(CoMP)估计信道,推导出CoMP信道的干扰抑制合并(IRC)滤波矩阵;其次,建立等效干扰模型,利用IRC滤波矩阵得到了小区间平均干扰;最后,计算出各小区用户对非CoMP集合小区的干扰程度,针对强干扰用户作出联合处理。理论分析和链路仿真表明,与上行协作多基站最优注水功率控制算法(UMBCA-OWFC)相比,ICIR-UMBCEEA的用户归一化平均干扰在中心用户和边缘用户处的下降幅度分别为19.2%和24.5%;而ICIR-UMBCEEA的能量利用效率在中心用户和边缘用户处分别提高了25.48%和18.03%;ICIR-UMBCEEA所消耗的能量更小,其中心用户的吞吐量更高,而边缘用户的吞吐量则与UMBCA-OWFC相差不大。实验结果表明,ICIR-UMBCEEA在实际工程中能够有效提高系统的能量效率。

Since the energy consumption of joint processing in uplink multi-base cooperative communication system is excessively high, an Inter-Cell Interference Rejection based Uplink Multi-Base Cooperative Energy Efficiency Algorithm( ICIR-UMBCEEA) was proposed. Firstly, equivalent noise and Coordinated Multi-Point( CoMP) estimated channel were gotten by DeModulation Reference Signal( DMRS) sequence, and the Interference Rejecting Combining( IRC) filtering matrix of CoMP channel was deduced; Secondly, an equivalent interference model was established and the average inter-cell interference was obtained by using IRC filtering matrix; Finally, interference level of user in each cell to non-CoMP set was calculated, and a joint processing against strong interference users was made. In the comparison experiments with Uplink Multi-Base Cooperative Algorithm of Optimal Water Filling Control( UMBCA-OWFC), the normalized average interference of ICIR-UMBCEEA decreased by 19. 2% in center users and 24. 5% in edge users, and the energy efficiency of it increased by25. 48% in center users and 18. 03% in edge users; ICIR-UMBCEEA had less energy consumption, and had higher throughput in center users and not much difference in edge users. The theoretical analysis and simulation results show that ICIR-UMBCEEA can effectively improve the energy efficiency of communication system in engineering.