基于协作中继的LTE-A干扰对齐技术研究

摘要

为满足下一代移动通信系统高速率传输的要求,LTE-A系统引入了无线中继技术,用户终端可通过中继节点接入网络以获得高质量的服务。但是随着中继节点及用户的增加会导致系统的同道干扰更加突出,成为限制LTE-A网络容量的主要因素。因此,需要研究有效的干扰抑制技术以增强网络性能。近年提出的干扰对齐技术能够获得干扰网络的最大自由度并可达其最优容量。研究了基于低秩干扰空间的多小区干扰对齐技术,然后将该算法推广到LTE-A中继网络,提出了基于协作中继的LTE-A干扰对齐方案。仿真结果表明,提出的干扰对齐技术能够有效提高LTE-A中继网络容量。%In order to improve the LTE-A system throughput,cooperative relay technique is proposed in 3GPP R8 specification.However,the deployment of a large number of relay nodes will lead serious co-channel interference(CCI).Recently,Interference Alignment(IA),which can effectively suppress CCI and obtain the optimal transmitting degree of freedom(DoF),is explored to maximize the capacity of wireless network.The low rank interference space based muticell Interference Alignment algorithm is investigated firstly.Then,an optimized IA scheme based on the cooperative relay for LTE-A network is proposed.Simulation results show that the presented IA scheme can improve the capacity of LTE-A network and reduce the implementation complexity.