非理想信道环境下的多小区干扰对齐技术研究

Research on Multi-cell Interference Alignment in delayed Interference Channel

由于普遍采用频率复用因子为1的方式组网,多小区干扰已成为限制无线通信系统容量的主要因素。为了有效抑制小区间干扰提高小区边缘吞吐量,近年提出了干扰对齐技术,其优势在于可以获得干扰信道的最高自由度。一般的干扰对齐研究仅限于理想信道,研究通过非理想信道环境下的多小区干扰对齐技术,分析了时延信道信息对干扰系统容量的影响。结果表明,信道状态信息的时延大大降低了系统容量,特别是在高信噪比条件下对系统性能的影响更大。

As a result of widely use of frequency reuse factor one in the wireless systems, multi-cell inter- ference has become a key factor constraining the system capacity. In order to suppress multi-cell interfer- ence and improve the cell-edge throughput, anti-jamming technology is very important in the multi-cell wireless network. As a realization of anti-jamming technology, interference alignment （IA） attracts wide attention, which can obtain the optimal transmitting degree of freedom （DoF） and max the capacity of the network. The traditional IA algorithm is based on ideal interference channel. However, The performance of multi-cell IA in presence of delayed interference channel is investigated. Simulation results show that the delayed channel state information seriously decreases the performance of IA, especially in present of high SNR.