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Heterogeneous Cellular Networks With LoS and NLoS Transmissions-The Role of Massive MIMO and Small Cells

Heterogeneous Cellular Networks With LoS and NLoS Transmissions-The Role of Massive MIMO and Small Cells
Zhang, QiYang, Howard H.Quek, Tony Q. S.Lee, Je Min
DGIST Authors
Lee, Je Min
Issue Date
IEEE Transactions on Wireless Communications, 16(12), 7996-8010
Article Type
Article in Press
Antenna arraysAntennasCellsGeometryHeterogeneous networksMIMO systemsMobile telecommunication systemsStochastic systemsWireless networksWireless telecommunication systemsDownlinkHeterogeneous cellular networksLoS/NLoSPropagation lossSmall cellsStochastic geometryTransmitting antennaWireless communicationsCytology
We develop a framework for downlink heterogeneous cellular networks with line-of-sight (LoS) and non-line-of-sight (NLoS) transmissions. Using stochastic geometry, we derive tight approximation of average downlink rate that enables us to compare the performance between densifying small cells and expanding BS antenna arrays. Interestingly, we find that adding small cells into the network improves the downlink rate much faster than expanding antenna arrays at the macro BS. However, when the small cell density exceeds a critical threshold, the spatial densification will lose its benefits and further impair the network capacity. To this end, we provide the optimal small cell density that maximizes the rate via numerical results for practical deployment guidance. In contrast, expanding macro BS antenna array can always benefit the capacity until an upper bound caused by pilot contamination, and this bound also surpasses the peak rate obtained from deployment of small cells. Furthermore, we find that allocating part of antennas to distributed small cell BSs works better than centralizing all antennas at the macro BS, and the optimal allocation proportion is also given numerically for practical configuration reference. In summary, this work provides a further understanding on how to leverage small cells and massive MIMO in future heterogeneous cellular networks deployment. IEEE
Institute of Electrical and Electronics Engineers Inc.
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  • Author   ISC(Information Security and Communication) Lab
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Department of Information and Communication EngineeringISC(Information Security and Communication) Lab1. Journal Articles

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