Smart Pilot Assignment for Massive MIMO
Smart Pilot Assignment for Massive MIMO
复制标题
大规模 MIMO 的智能导频分配
DOI：
10.1109/lcomm.2015.2409176
复制
发表时间：
2015-09-01
期刊：
影响因子：
--
通讯作者：
Qian, Chen
中科院分区：
文献类型：
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作者：
Zhu, Xudong;Wang, Zhaocheng;Qian, Chen
大规模多输入多输出（MIMO）系统利用基站（BS）处的大量天线来服务多个用户，该系统由于小区间干扰而遭受导频污染。本文提出了一种智能导频分配（SPA）方案，以改善严重导频污染用户的性能。具体地，通过利用衰落信道的大尺度特性，BS首先测量每个导频序列在其他相邻小区中由具有相同导频序列的用户引起的小区间干扰。然后，与随机分配导频序列给用户的传统方案相比，所提出的SPA方法以顺序的方式将具有最小区间干扰的导频序列分配给具有最差信道质量的用户，以提高其性能。仿真结果验证了该方案在典型大规模MIMO系统中的性能增益。
A massive multiple-input multiple-output (MIMO) system, which utilizes a large number of antennas at the base station (BS) to serve multiple users, suffers from pilot contamination due to inter-cell interference. A smart pilot assignment (SPA) scheme is proposed in this letter to improve the performance of users with severe pilot contamination. Specifically, by exploiting the large-scale characteristics of fading channels, the BS first measures the inter-cell interference of each pilot sequence caused by the users with the same pilot sequence in other adjacent cells. Then, in contrast to the conventional schemes which assign the pilot sequences to the users randomly, the proposed SPA method assigns the pilot sequence with the smallest inter-cell interference to the user having the worst channel quality in a sequential way to improve its performance. Simulation results verify the performance gain of the proposed scheme in typical massive MIMO systems.