| 摘要: |
| 在大规模多入多出正交频分复用技术（MIMO-FBMC）下行链路系统中，大量微小区部署在宏小区覆盖区域内，并且宏小区和微小区共享相同频谱.在宏小区引入大规模多进多出（MIMO）技术，在相对较窄的角度扩展下从宏小区可以看到同一热点内的用户几乎位于同一位置，这就引起了方向性的信道向量.利用这个信道向量的空间方向信息采用协调波束成形，获得空间消隐，即将传输能量集中在某些特定的方向上，从而给位于其他方向上的微小区创造传输数据的机会，以减少对这些微小区的干扰.此方法类似于增强型小区间干扰协调技术（eICIC）中的几乎空白子帧（ABS）方法.仿真结果表明，该方案能有效提高大规模MIMO-FBMC系统的容量. |
| 关键词: 大规模MIMO-FBMC 微小区 空间消隐 协调波束成形 |
| DOI：10.3969/J.ISSN.1000-5137.2017.01.014 |
| 分类号: |
| 基金项目:上海市自然基金项目（16ZR1424500） |
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| Spatial blanking method for massive MIMO-FBMC system |
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Wang Jia'nan, Zhou Xiaoping, Li Li, Xiang Haokai, Wang Bin
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College of Information, Mechanical and Electrical Engineering, Shanghai Normal University, Shanghai 200234, China
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| Abstract: |
| In this paper,we study the downlink performance of MIMO-FBMC system where small cells are deployed under a macrocell,both macro and small cells share the same spectrum.Assume the regime of massive MIMO in the macrocell,the users of the same hotspot are seen under a relatively narrow angular spread from the macrocell appearing almost co-located to the macrocell.This leads to directional channel vectors,which can be exploited to simplify coordinated beamforming techniqueand obtain spatial blanking,a means of concentrating energy only in certain directions while creating transmission opportunities for the small cells lying in the other directions,and mitigating interference to the small cells.It is in analogy with the almost-blank subframes approach of eICIC.Simulation results show that the proposed algorithm can improve the system capacity of massive MIMO-FBMC. |
| Key words: massive MIMO-FBMC small cells spatial blanking coordinated beamforming |
