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http://dx.doi.org/10.1109/JCN.2013.000070

Before/After Precoding Massive MIMO Systems for Cloud Radio Access Networks  

Park, Sangkyu (School of EECS, INMC, Seoul National University)
Chae, Chan-Byoung (School of Integrated Technology, Yonsei University)
Bahk, Saewoong (School of EECS, INMC, Seoul National University)
Publication Information
Journal of Communications and Networks / v.15, no.4, 2013 , pp. 398-406 More about this Journal
Abstract
In this paper, we investigate two types of in-phase and quadrature-phase (IQ) data transfer methods for cloud multiple-input multiple-output (MIMO) network operation. They are termed "after-precoding" and "before-precoding". We formulate a cloud massive MIMO operation problem that aims at selecting the best IQ data transfer method and transmission strategy (beamforming technique, the number of concurrently receiving users, the number of used antennas for transmission) to maximize the ergodic sum-rate under a limited capacity of the digital unit-radio unit link. Based on our proposed solution, the optimal numbers of users and antennas are simultaneously chosen. Numerical results confirm that the sum-rate gain is greater when adaptive "after/before-precoding" method is available than when only conventional "after-precoding" IQ-data transfer is available.
Keywords
Cloud base station; cloud radio access netwrok (C-RAN); in-phase and quadrature-phase (IQ) data; massive multiple-input multiple-output (MIMO); multi-user MIMO;
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