个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:大连理工大学
学位:博士
所在单位:信息与通信工程学院
学科:信号与信息处理. 通信与信息系统
办公地点:大连理工大学创新园大厦A526室
联系方式:0411-84706005-3526
电子邮箱:zhechen@dlut.edu.cn
Eradication of pilot contamination and zero forcing precoding in the multi-cell TDD massive MIMO systems
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论文类型:期刊论文
发表时间:2017-09-07
发表刊物:IET COMMUNICATIONS
收录刊物:Scopus、SCIE、EI
卷号:11
期号:13
页面范围:2027-2034
ISSN号:1751-8628
关键字:precoding; MIMO communication; channel estimation; statistical analysis; zero forcing precoding; multicell TDD massive MIMO systems; massive multiple-input multiple-output systems; uplink pilot training; channel reciprocity property; channel estimation; time division duplex operation; pilot contamination elimination scheme; orthogonal variable spreading factor code row; OVSF code row; Zadoff-Chu sequences; interference free downlink transmission; second-order statistics
摘要:In massive multiple-input multiple-output (M-MIMO) systems, the base station (BS) estimates the downlink and uplink channels using the uplink pilot training in conjunction with channel reciprocity property of time division duplex (TDD) operation. However, this channel estimation is contaminated due to the use of non-orthogonal pilot sequences for the uplink training in neighbouring cells that results in inter-cell interference. This study proposes an effective pilot contamination elimination scheme along with zero forcing precoding for multi-cell TDD M-MIMO systems. In the proposed scheme, each BS is assigned with a specific orthogonal variable spreading factor (OVSF) code row and a set of Zadoff-Chu (ZC) sequences are used for uplink pilot training. Then, the set of ZC sequences is multiplied element-wise at each BS with its OVSF code row to generate the orthogonality among the pilot sequences across the neighbouring cells. The proposed method can promise uncontaminated channel estimation and interference free downlink transmission without requiring the knowledge of the channels' second-order statistics and without increasing the training overhead by a factor equal to the number of interfering cells. The simulation results authenticate the effectiveness and superiority of the proposed scheme over other schemes.