| 大规模MIMO系统中的伪随机码导频设计 |
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| 引用本文： | 方昕,张建锋,曹海燕,应娜.大规模MIMO系统中的伪随机码导频设计[J].应用科学学报,2016,34(1):1-11. |
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| 作者姓名： | 方昕 张建锋 曹海燕 应娜 |
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| 作者单位： | 1. 杭州电子科技大学通信工程学院, 杭州 310018;
2. 东南大学移动通信国家重点实验室, 南京 211189 |
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| 基金项目： | 浙江省自然科学基金(No.LY12F01009);浙江省教育厅科研项目基金(No.Y201329723);东南大学国家重点实验室开放课题基金(No.2012D18)资助 |
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| 摘 要： | 针对大规模MIMO系统中存在的导频污染问题,提出一种有效的导频设计方案.在所有小区复用同一组正交导频的情况下,为每个小区分配不同时延的伪随机码,利用各小区内的伪随机码对小区内用户导频进行同步加扰,以获得用户的发送导频.推导并分析了该导频设计方案下期望信道估计的均方误差.理论和仿真结果表明,该导频设计方案能有效提高信道估计性能,提升整个系统下行链路的性能.
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| 关 键 词： | 大规模MIMO 导频污染 信道估计 伪随机码 |
| 收稿时间： | 2015-04-15 |
| 修稿时间： | 2015-06-15 |
Pilot Design Based on Pseudo-random Code in Massive MIMO System |
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| FANG Xin,ZHANG Jian-feng,CAO Hai-yan,YING Na.Pilot Design Based on Pseudo-random Code in Massive MIMO System[J].Journal of Applied Sciences,2016,34(1):1-11. |
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| Authors: | FANG Xin ZHANG Jian-feng CAO Hai-yan YING Na |
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| Institution: | 1. College of Communications Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;
2. National Mobile Communications Research Laboratory, Southeast University, Nanjing 211189, China |
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| Abstract: | To deal with pilot contamination in massive MIMO systems, an efficient pilot design scheme is proposed. Different pseudo-random codes are assigned to different cells, all using the same set of orthogonal pilots. These codes are used to scramble the user pilot in each cell to get a transmission pilot. Mean square error (MSE) performance of expected channel estimation is derived and analyzed. Simulation results show that the channel estimation performance can be effectively improved when a proper pseudo-random code is chosen with the proposed pilot design method. It can greatly enhance the downlink performance in all cells. |
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| Keywords: | massive MIMO pilot contamination channel estimation pseudo-random code |
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