NDLI: Low-overhead constant envelope precoding in multi-cell massive MIMO systems with pilot contamination

Content Provider	IET Digital Library
Author	Shahabi, Seyyed Mohammad Mahdi Ardebilipour, Mehrdad Omid, Yasaman Kazemi, Mohammad
Abstract	The authors consider downlink transmission in a multi-cell massive multiple-input and multiple-output (MIMO) system and focus on decreasing the feedback overhead caused by cell cooperation in constant envelope precoding (CEP). In the literature, the single-cell case for CEP with perfect channel state information (CSI) has been studied. Here, considering full cooperation among the cells, they develop CEP for the multi-cell case. They devise a low overhead centralised construction for CEP which employs limited cooperation among the cells, providing higher system throughput. To achieve the minimum feedback overhead, a distributed realisation of CEP is proposed where each cell locally performs CEP. Furthermore, a new optimisation problem is solved to compensate for the effects of pilot contamination. In addition, to reduce the computational complexity, a relaxed iterative form is presented for the limited cooperation and the distributed scenarios. Numerical results show that in the proposed structures, despite a tremendous decrease in the system overhead, the performance confronts merely an insignificant degradation, <10%, compared to the full-cooperation case. Moreover, in the presence of imperfect CSI, the performance of the distributed structure whose imperfect CSI is compensated for, approaches the performance of this structure in the perfect CSI scenario.
Starting Page	926
Ending Page	933
Page Count	8
ISSN	17518628
Volume Number	13
e-ISSN	17518636
Issue Number	Issue 7, Apr (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/13/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.5196
Journal	IET Communications
Publisher Date	2019-01-31
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Array Cell Cooperation Cellular Radio CEP Channel Estimation Code Communication Channel Equalisation And Identification Full-cooperation Case Higher System Throughput Interpolation And Function Approximation Iterative Method Low Overhead Centralised Construction Low-overhead Constant Envelope MIMO Communication Minimum Feedback Overhead Mobile Radio System Multicell Case Multicell Massive MIMO System Multicell Massive Multiple-input Multiple-output Numerical Analysis Perfect Channel State Information Pilot Contamination Precoding Radio Link And Equipment Single-cell Case Statistics System Overhead
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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