| 多天线两小区蜂窝系统的低开销线性干扰对齐算法 |
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| 引用本文： | 卢华兵,谢显中,马彬,雷维嘉.多天线两小区蜂窝系统的低开销线性干扰对齐算法[J].信号处理,2012,28(8):1148-1155. |
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| 作者姓名： | 卢华兵 谢显中 马彬 雷维嘉 |
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| 作者单位： | 重庆邮电大学宽带接入网络研究所,重庆,400065 |
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| 基金项目： | 国家自然科学基金，重庆市自然科学基金，重庆市教委科学技术研究项目 |
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| 摘 要： | 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。
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| 关 键 词： | 两小区蜂窝系统 多天线系统 干扰对齐 自由度 |
Low Overhead Linear Interference Alignment Algorithm for Two-cell MIMO Cellular Systems |
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| LU Hua-bing
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XIE Xian-zhong
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MA Bin
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LEI Wei-jia.Low Overhead Linear Interference Alignment Algorithm for Two-cell MIMO Cellular Systems[J].Signal Processing,2012,28(8):1148-1155. |
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| Authors: | LU Hua-bing XIE Xian-zhong MA Bin LEI Wei-jia |
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| Affiliation: | (Institute of Broadband Access Technologies,Chongqing University of Posts and Telecommunications,Chongqing 400065,China) |
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| Abstract: | 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. |
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| Keywords: | two-cell cellular systems multiple input multiple output systems interference alignment degrees of freedom |
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