LTE-A高密异构网场景下基于干扰排污技术的干扰管理

Interference Management Based on Interference Draining Technology in LTE-A High-density Heterogeneous Network

在LTE-A高密异构网场景下,干扰对齐(IA)被用来消除小区间的干扰。然而,随着小区数目的增加,干扰对齐的条件会变得很难满足。针对此问题,提出了干扰排污(ID)的思想,通过寻找未被充分利用的系统资源空间,并且适当地放宽干扰对齐的条件,实现对空域、频域自由度(DOF)的充分利用。首先,寻找干扰排污空间,然后基于交替最小化的方法求解小区的预编码矩阵和接收滤波器,最后对干扰排污空间用户利用IRC(Interference Rejection Combine)算法重新求解其接收滤波器。仿真结果表明,可以在每个基站天线数目固定的条件下不断地增加小区数目,并且同时获得一定的吞吐量增益。

Interference alignment( IA) technology can be used to eliminate inter- cell interference( ICI) in the LTE- A high- density heterogeneous network. However,due to an increase of cell number,interference alignment conditions cannot be always met. In view of this problem,this paper proposes a scheme based on interference draining( ID) thoughts. By looking for the underused space of system resource and appropriately relaxing the IA conditions,the full utilization of degrees of freedom( DOF) in the spatial and frequency domain is achieved. Firstly,it looks for the available draining space,then obtains the pre- coding and receive filter according to the alternating minimization approach. Finally,for the draining space provider,it uses Interference Rejection Combine( IRC) algorithm to solve the receiving filter again. Simulation results indicate that the scheme is effective to get some throughput gain when fixed number of base station antennas is assumed and the number of cells continues to increase.