一种CoMP系统的频率复用方法及性能分析

A fractional frequency reuse scheme in CoMP system and performance analysis

协作多点技术(CoMP)是LTE-Advanced系统中用于提高小区边缘用户性能的一项关键技术。然而,小区边缘用户性能得不到保证甚至恶化。为此本文基于支持宏分集的频率复用方法提出了一种适用于CoMP-SU-MIMO模式的分数频率复用方法。该方法通过设置信道增益差门限将边缘用户分为两类,分别由两小区和三小区协作提供服务,以此提高频率利用率。仿真结果表明,该方法与非CoMPFFR相比边缘用户平均速率有了极大提高。合理的频率复用系数和信道增益门限能够进一步提高边缘用户的平均速率。

Coordinated Multiple Point（CoMP） is one key technology to improve cell edge users＇ performance in the system of LTE-Advanced.However,cell edge users＇ performance is unreliable and even deteriorating.Thus a scheme of fractional frequency reuse（FFR） suitable for CoMP-SU-MIMO mode is proposed based on the FFR with Marco Diversity.By setting a threshold of the difference of the channel gain,we divide cell edge users into two classes served by two cells and three cells respectively,which can improve frequency efficiency.Simulation results show that the proposed scheme improves cell edge users＇ average bit rate significantly compared with none-CoMP FFR scheme.Suitable FRF and the threshold of the difference of the channel gain can further improve cell edge users＇ average bit rate.