Distribution of Downlink Inter-cell Interference Based on Gaussian Mixture Model
YAN Xiaojun①③ XU Jing①② ZHU Yuanping①② YANG Yang①② WANG Jiang①②
①(Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China) ②(Shanghai Research Center for Wireless Communications, Shanghai 201210, China) ③(University of Chinese Academy of Sciences, Beijing 100049, China)
在正交频分多址接入(Orthogonal Frequency Division Multiple Access, OFDMA)蜂窝网络中，小区间干扰的统计特性与网络性能密切相关。下行小区间干扰的累积分布函数(Cumulative Distribution Function, CDF)还没有一个闭合表达式。该文提出一种参数可显式计算的高斯混合模型对下行小区间干扰分布进行近似。进一步，利用高斯混合模型将下行小区间干扰的累积分布函数近似表示为若干个误差函数的加权和。仿真验证了高斯混合模型的准确性，并且表明基于高斯混合模型的累积分布函数能很好地近似下行小区间干扰的累积分布函数。
In Orthogonal Frequency Division Multiple Access (OFDMA)-based cellular networks, the statistical characteristics of the Inter-Cell Interference (ICI) are closely related to network performances. There is no closed-form expression for the Cumulative Distribution Function (CDF) of the ICI. The Gaussian Mixture Model (GMM) whose parameters can be computed explicitly is proposed to approximate the distribution of the downlink ICI. Then using the GMM, the CDF of the ICI is approximated as the weighted sum of some error functions. Simulation verifies the accuracy of the GMM and shows that the CDF based on the GMM can well approximate the CDF of the ICI.
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