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Appl. Sci. 2017, 7(1), 96;

Beam Grouping Based RS Resource Reuse and De-Contamination in Large Scale MIMO Systems

School of Intelligent Mechatronic Engineering, Sejong University, Seoul 05006, Korea
Departmemt of Electronic Engineering, Kwangwoon University, Seoul 01897, Korea
Author to whom correspondence should be addressed.
Academic Editors: Hung-Yu Wang and Christos Bouras
Received: 27 October 2016 / Revised: 21 December 2016 / Accepted: 16 January 2017 / Published: 19 January 2017
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It is well known that large scale multiple-input multiple-output (LS-MIMO) systems are very attractive technology to increase both spectral efficiency (SE) and energy efficiency (EE). However, one of big obstacles to the realization of the LS-MIMO system is the overhead of reference signals (RSs), since the number of RS increases as the number of transmitter (TX) antennas increases. In this paper, the RS overhead problem is analyzed, and we propose an RS overhead reduction scheme based on beam grouping, which is called beam grouping based resource reuse (BGRR). The proposed scheme divides one cell into several sectors and reuses the RS resources for the different sectors. The resource conflict is reduced using beam separability. According to the analysis and the simulation results, the proposed scheme can remarkably reduce the RS overhead and improve the SE performance significantly. View Full-Text
Keywords: reference signal; large scale MIMO system; resource reuse reference signal; large scale MIMO system; resource reuse

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Lee, B.M.; Kim, Y. Beam Grouping Based RS Resource Reuse and De-Contamination in Large Scale MIMO Systems. Appl. Sci. 2017, 7, 96.

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