多天线两小区蜂窝系统的低开销线性干扰对齐算法
卢华兵;谢显中;马彬;雷维嘉
【期刊名称】《信号处理》 【年(卷),期】2012(028)008
【摘要】The users' performances are affected by the interferences in cellular systems. Especially for the users on the boundary whose communication qualities are poor. The interference alignment (IA) is a promising technology to effectively mitigate interferences and improve system throughput in wireless communications which has received lots of attentions. In this paper, we propose a linear IA algorithm that can achieve high degrees of freedom with less antennas for the users on the boundary of two-cell multiple-input multiple-output (MIMO) cellular systems. The algorithm uses the precoding vectors to eliminate the inter-user interference (IUI) and uses the interference suppression vectors to remove the inter-cell interference (ICI). Assuming each Base station equipped with M antennas communicate with K users each equipped with N antennas. Just let M=K and N=K+1 , the proposed algorithm can complete downlink and uplink IA and can achieve a total DOF of 2K with low overhead. The algorithm doesn' t require inter-cell feedback in the downlink and it requires only a small amount of inter-cell feedback in the uplink. Simulation results show that the proposed algorithm can achieve better performance than the conventional
schemes.%在蜂窝系统中,由于干扰的存在,用户性能受到影响,特别是对于小区边缘用户,其通信质量较差.干扰对齐作为一种能够消除干扰、提高系统容量的技术,近年来受到广泛关注.针对多天线两小区蜂窝系统的边缘用户,本文给出了一种系统开销小、需要天线数少的线性干扰对齐算法.该算法利用发送端预编码矢量消除小区内干扰,利用接收端干扰抑制矢量消除小区间干扰.采用本文算法后,在每个小区有K个用户、基站有M根发送天线、用户有N根接收天线的情况下,只需M=K和N=K+1就可以实现上下行的干扰对齐,整个系统可以达到2K的自由度,并且在下行链路中不需要小区间反馈,而在上行链路中只需要较小的小区间反馈.仿真结果表明,本文提出的算法能够以较小的开销实现比以往的算法更好的性能.
【总页数】8页(1148-1155)
【关键词】两小区蜂窝系统;多天线系统;干扰对齐;自由度 【作者】卢华兵;谢显中;马彬;雷维嘉
【作者单位】重庆邮电大学宽带接入网络研究所,重庆400065;重庆邮电大学宽带接入网络研究所,重庆400065;重庆邮电大学宽带接入网络研究所,重庆400065;重庆邮电大学宽带接入网络研究所,重庆400065 【正文语种】中文 【中图分类】TN929.53 【文献来源】
https://www.zhangqiaokeyan.com/academic-journal-cn_journal-signal-processing_thesis/0201237877122.html 【相关文献】
1.三小区多用户蜂窝系统的分组干扰对齐算法 [J], 施赵媛; 谢显中; 丛红艺; 胡浪涛
2.蜂窝网络下行链路中基于干扰图的干扰对齐算法 [J], 杨真; 刘祖军; 田红心 3.三小区多用户MIMO系统中干扰对齐优化算法 [J], 高向川; 刘晓叶; 高小梅 4.两小区 MIMO 系统上行干扰对齐传输 [J], 李川
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多天线两小区蜂窝系统的低开销线性干扰对齐算法
