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승언 평
5 years ago
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1 Standard and Technology of Full-Dimension MINO Systems in LTE-Advances Pro Massive MIMO has been studied in academia foreseeing the capacity crunch in the coming years. Presently, industry has also started to pay attention to realizing the initial stage of massive MIMO system. A few proof-ofconcept systems are being reported recently. In addition, 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) has finished a Study Item (SI) on Full-Dimension MIMO (FD-MIMO). The SI investigated feasibility of FD-MIMO systems which support up to 64 transceiver units (TXRUs) with 2D antenna arrays that have a similar form factor as existing base station antennas. The scope of the SI involves both Time-Division- Duplex (TDD) and Frequency-Division Duplex (FDD), so that the technology can be used in the existing 4G cellular carrier frequency. This article provides an overview of challenges and corresponding design considerations for standardizing FD-MIMO, including the outcomes of the SI. In particular, potential enhancements in Channel State Information (CSI) feedback design will be investigated in details. Keywords: FD-MIMO, 3D beamforming, 2D array antenna

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12 channels,'' IEEE Trans. Wireless Commun., Vol. 6, No. 5, 2007, pp [7] C. Lim, T. Yoo, B. Clerckx, B. Lee and B. Shim, ''Recent trends of multiuser MIMO in LET- Advanced,'' IEEE Communication Magazine, [8] 3GPP Technical Reports TR36.873, ''Study on 3D channel model for LTE''. [9] 3GPP Technical Reports TR36.897, ''Study on Elevation Beamforming/Full-Dimension (FD) MIMO for LTE''. [10] 3GPP Technical Reports TR36.847, ''E-UTRA and UTRA; Radio Frequency (RF) requirement background for Active Antenna System (AAS) Base Station (BS)''. [11] E. Dahlman, S. Parkvall and J. Skold, 4G LTE/ LTE-Advanced for Mobile Broadcast. Academia Press, [1] T. L. Marzetta ''Non cooperative cellular wirelesswith unlimited numbers of base station antennas,'' IEEE Trans. WirelessCommun., Vol. 9, No. 11, 2010, pp [2] Y. Kim, H. Ji, J. Lee, Y.H. Nam, B. L. Ng, I. Tzanidis, Y. Li and J. Zhang, ''Full Dimension MIMO (FD- MIMO): The Next Evolution of MIMO in LTE Systems,'' Wireless Communication Magazine, [3] Y. H. Nam, B. L. Ng, S. K, Y. Li, J. Zhang, Y. Kim and J. Lee, ''Full-dimensionMIMO(FD-MIMO) for next generation cellular techonology,'' Vol. 51, Issue 6, IEEE Communication Magazine, [4] /en/ZTE-China-Mobile-Complete- Test-World%E2%80%99s-Pre5G [5] /networks/insights/news/samsung-demonstrates-atrio-of-5g-technology-candidatesat-mwc-2015 [6] M. Sadek, A. Tarighat, and A. Sayed, ''A leakage based precoding scheme for downlink multi user MIMO

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¼º¿øÁø Ãâ·Â-1 Bandwidth Efficiency Analysis for Cooperative Transmission Methods of Downlink Signals using Distributed Antennas In this paper, the performance of cooperative transmission methods for downlink transmission