大规模MIMO系统中伪随机序列加扰法的导频分配  

Pilot Allocation Scheme for Pseudo-random Sequence Scrambling in Massive MIMO System

作　　者：韩知雨 董静薇[1] 闫宁 王欣 李佳 HAN Zhi-yu;DONG Jing-wei;YAN Ning;WANG Xin;LI Jia(School of Measure-Control Technology and Communication Engineering, Harbin University of Science and Technology, Harbin 150080, China)

机构地区：[1]哈尔滨理工大学测控技术与通信工程学院,哈尔滨150080

出　　处：《哈尔滨理工大学学报》2021年第1期115-121,共7页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(61601149);黑龙江省科学基金(QC2017074);黑龙江省普通本科高等学校青年创新人才培养计划资助项目(UNPYSCT-2018199).

摘　　要：针对大规模MIMO系统中由于各小区复用相同导频序列而产生的导频污染问题,提出一种联合极坐标导频分配和伪随机码导频设计的方案。先对每个小区内的所有用户用极坐标对其方位进行标注,并根据用户的极角大小依次分配导频序列,再采用不同时延的伪随机码对不同小区使用同一导频序列的用户进行加扰,以此提升信道估计的准确度。通过理论推导与数据仿真分析,该方案能够有效地减少信道估计的均方误差,提高用户端上行链路传输的信干噪比及平均传输速率。从而减轻导频污染给信道估计造成的不利影响并提高信道吞吐量。In this paper,a scheme of joint polar coordinate pilot assignment and pseudo-random code pilot design is proposed to solve the pilot contamination caused by the reuse of the same pilot sequence in each cell of the Massive MIMO system.First,all users in each cell were marked with polar coordinates,and pilot sequences were allocated according to the size of the user′s polar angle.Then,pseudo-random codes with different time delays were used to disturb to users using the same pilot sequence in different cells,so as to improve the accuracy of channel estimation.Through theoretical derivation and data simulation analysis,the scheme can effectively reduce the minimum mean square error of channel estimation and improve the signal-to-noise ratio and average transmission rate of uplink transmission.Thus the adverse effect of pilot contamination on channel estimation is reduced and the channel throughput is improved.

关 键 词：大规模MIMO 导频污染 信道估计 导频序列 均方误差 

分 类 号：TN929.53[电子电信—通信与信息系统]