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Enabling the high data rates of millimeter wave (mmWave) cellular systems requires deploying large antenna arrays at both the basestations and mobile users. Prior work on coverage and rate of mmWave cellular networks focused on the case when basestations and mobile beamforming vectors are predesigned for maximum beamforming gains. Designing beamforming/combining vectors, though, requires training,...
A concept of full-dimension MIMO (FD-MIMO) adopting 2-dimensional (2D) antenna array has been proposed with intent to cope with practical challenges of massive MIMO systems. In this paper, we investigate an FD-MIMO operation that can be transparently applied with current 3GPP LTE specifications, and propose a novel method that facilitates an accurate estimation of channel quality indicator (CQI) at...
We present an enhanced CSI feedback scheme for FD-MIMO systems based on a linear combination codebook. To reduce codebook search complexity, an efficient codebook search method is also provided. Both capacity-based and system-level performance evaluations of the proposed scheme are conducted and the performance is compared with the Kronecker product codebook based scheme. The proposed linear combination...
Elevation beamforming and Full Dimension MIMO (FD-MIMO) has been an active area of research and standardization in 3GPP LTE-Advanced. In an FD-MIMO system, a base station with 2-dimensional (2D) active array supports multi-user joint elevation and azimuth beamforming (a.k.a. 3D beamfoming), which results in much higher cell capacity compared to conventional systems. Recent study has shown that with...
This paper presents the theoretical capacity performance of different linear multi-user MIMO (MU-MIMO) pre-coding algorithms for a millimeter wave communication system using hybrid beam-forming. Hybrid beam-forming uses both RF and digital beam-forming and is a practical way to achieve the required array gains when the high bandwidths available at millimeter wave frequencies are utilized. The performances...
Small cells deployments, at carrier frequencies much higher than the current cellular deployments, featuring electronically steerable transmit and receive antenna arrays offering high-gain beam-forming, are likely to form the basis of next generation cellular networks (sometimes referred to as 5G). This shift to smaller cells and high-gain directional transmit/receive technologies will be accompanied...
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