Downlink multi-user interference alignment in two-cell scenario

2011 12th Canadian Workshop on Information Theory Pub Date : 2011-05-17 DOI:10.1109/CWIT.2011.5872152

A. Bayesteh, A. Mobasher, Yongkang Jia

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引用次数: 20

Abstract

In this paper, the problem of Downlink Multi-User MIMO (DL MU-MIMO) transmission from two interfering transmitters, each equipped with M antennas to multiple users each equipped with K antennas is considered. It is assumed that all users receive a single data stream of rank one from only one of the transmitters. A novel transmission/reception scheme is proposed based on the idea of Interference Alignment (IA), which aligns the interference coming from each transmitter to the users in the other cell along a single predetermined vector vref, and hence, leaves more degrees of freedom for signal transmission from each transmitter. Furthermore, unlike other IA-based schemes in the literature, only local Channel State Information (CSI) is required at nodes. It is shown that for the case of K ≥ M, the total degrees of freedom of 2M − 2 is achievable. The proposed scheme is also extended to the case of K <M based on the ideas of Euclidean distance minimization and time/frequency extension. Finally, simulation results are provided to compare the performance of the proposed scheme with that of the existing results in the literature.

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双小区下行链路多用户干扰对准

本文研究了从两个具有M天线的干扰发射机向多个具有K天线的用户的下行链路多用户MIMO (DL MU-MIMO)传输问题。假设所有用户只从一个发射机接收到一个等级为1的数据流。基于干扰对齐(IA)的思想，提出了一种新的发射/接收方案，该方案将来自每个发射机的干扰沿单个预定矢量vref对齐到另一个单元的用户，从而为每个发射机的信号传输留下更多的自由度。此外，与文献中其他基于ia的方案不同，节点只需要本地信道状态信息(CSI)。结果表明，当K≥M时，总自由度2M−2是可以实现的。基于欧氏距离最小化和时频扩展的思想，将所提出的方案推广到K <M的情况。最后，给出了仿真结果，将所提方案的性能与文献中已有的结果进行了比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2011 12th Canadian Workshop on Information Theory

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