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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,...
Recently, considerable research has been focused on the design of random cognitive radio networks because base stations are randomly located in modern cellular networks and also because of an anticipated shortage of spectrum. This study investigates the performance of cognitive radio networks using a stochastic geometry approach in Rayleigh-lognormal fading. We present a geometric model of cognitive...
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 investigate the energy efficiency with the relation of area spectral efficiency of a cognitive radio network using stochastic geometry approach. Network coverage probabilities are derived for the interference of cognitive transmitters and primary transmitters, with consideration of two important parameters: probability of ideal channel and probability of transmission schedule. Furthermore, we formulate...
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...
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