Aligning power in multiple domains for pilot decontamination in massive MIMO

doi:10.1109/TWC.2017.2754490

	Aligning power in multiple domains for pilot decontamination in massive MIMO
	Luo, Xiliang1 ; Zhang, Xiaoyu1,2,3 ; Cai, Penghao1 ; Qian, Hua 4
	2017-12-01
会议录名称	IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS (IF:8.9[JCR-2023],8.6[5-Year])
ISSN	1536-1276
卷号	16
期号	12
页码	7919-7935
DOI	10.1109/TWC.2017.2754490
摘要	Pilot contamination in the uplink (UL) can severely hurt the channel acquisition performance at the base station (BS) in a massive multiple-input multiple-output (MIMO) system. To mitigate the interference, it is critical to explore all the allowed avenues to provide more orthogonal resources for the users to transmit non-interfering UL pilots. In this paper, with a realistic massive MIMO orthogonal frequency-division multiplexing (OFDM) system model, allowing the channels to be both frequency-selective and time-selective, we propose to mitigate the UL pilot contamination through aligning the channel power in multiple domains, i.e., the time, angular, and Doppler domains. First, we show how to align the power-delay profiles of different users so that the pilots sent within one common reference OFDM symbol are orthogonal. Second, we demonstrate our proposed time-varying pilots can asymptotically mitigate the pilot contamination by aligning the Doppler power spectra (DPSs) judiciously even when the UL channels vary with time. Further-more, in the case of massive MIMO, as the angles of arrival of the UL paths are acquired by the BS, we show the pilot contamination can be reduced or eliminated by jointly aligning the DPSs and the angular power spectra. Extensive computer simulations convince us the proposed Power Aligning principle can serve as the baseline design philosophy for the UL pilots in massive MIMO. © 2017 IEEE.
关键词	Contamination MIMO systems Power spectrum Angular power spectrum Doppler power spectrum Path aligning Pilot contaminations Power aligning Power delay profiles Time division duplexing
收录类别	EI
语种	英语
出版者	Institute of Electrical and Electronics Engineers Inc., United States
EI入藏号	20174104260305
EI主题词	Orthogonal frequency division multiplexing
EISSN	1558-2248
EI分类号	716.1 Information Theory and Signal Processing
原始文献类型	Conference article (CA)
引用统计	正在获取...
文献类型	会议论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/251887
专题	信息科学与技术学院_博士生信息科学与技术学院_PI研究组_罗喜良组
作者单位	1.School of Information Science and Technology, ShanghaiTech University, Shanghai; 201210, China; 2.Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai; 200050, China; 3.University of Chinese Academy of Sciences, Beijing; 100049, China; 4.Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai; 201210, China
第一作者单位	信息科学与技术学院
第一作者的第一单位	信息科学与技术学院
推荐引用方式 GB/T 7714	Luo, Xiliang,Zhang, Xiaoyu,Cai, Penghao,et al. Aligning power in multiple domains for pilot decontamination in massive MIMO[C]:Institute of Electrical and Electronics Engineers Inc., United States,2017:7919-7935.