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dc.contributor.author Zhang, Qi -
dc.contributor.author Yang, Howard H. -
dc.contributor.author Quek, Tony Q. S. -
dc.contributor.author Lee, Je Min -
dc.date.available 2017-10-30T04:20:01Z -
dc.date.created 2017-10-30 -
dc.date.issued 2017-12 -
dc.identifier.issn 1536-1276 -
dc.identifier.uri http://hdl.handle.net/20.500.11750/4628 -
dc.description.abstract 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 -
dc.language English -
dc.publisher Institute of Electrical and Electronics Engineers Inc. -
dc.title Heterogeneous Cellular Networks With LoS and NLoS Transmissions-The Role of Massive MIMO and Small Cells -
dc.type Article -
dc.identifier.doi 10.1109/TWC.2017.2756044 -
dc.identifier.scopusid 2-s2.0-85030792547 -
dc.identifier.bibliographicCitation IEEE Transactions on Wireless Communications, v.16, no.12, pp.7996 - 8010 -
dc.description.isOpenAccess FALSE -
dc.subject.keywordAuthor Antenna arrays -
dc.subject.keywordAuthor Downlink -
dc.subject.keywordAuthor Heterogeneous cellular networks -
dc.subject.keywordAuthor LoS/NLoS -
dc.subject.keywordAuthor massive MIMO -
dc.subject.keywordAuthor MIMO -
dc.subject.keywordAuthor Propagation losses -
dc.subject.keywordAuthor small cells -
dc.subject.keywordAuthor stochastic geometry -
dc.subject.keywordAuthor Transmitting antennas -
dc.subject.keywordAuthor Wireless communication -
dc.subject.keywordPlus ENERGY EFFICIENCY -
dc.subject.keywordPlus PERFORMANCE -
dc.subject.keywordPlus WIRELESS -
dc.subject.keywordPlus SYSTEMS -
dc.citation.endPage 8010 -
dc.citation.number 12 -
dc.citation.startPage 7996 -
dc.citation.title IEEE Transactions on Wireless Communications -
dc.citation.volume 16 -
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Department of Electrical Engineering and Computer Science ISC(Information Security and Communication) Lab 1. Journal Articles

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