Cited time in webofscience Cited time in scopus

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

Title
Heterogeneous Cellular Networks With LoS and NLoS Transmissions-The Role of Massive MIMO and Small Cells
Author(s)
Zhang, QiYang, Howard H.Quek, Tony Q. S.Lee, Je Min
Issued Date
2017-12
Citation
IEEE Transactions on Wireless Communications, v.16, no.12, pp.7996 - 8010
Type
Article
Author Keywords
Antenna arraysDownlinkHeterogeneous cellular networksLoS/NLoSmassive MIMOMIMOPropagation lossessmall cellsstochastic geometryTransmitting antennasWireless communication
Keywords
ENERGY EFFICIENCYPERFORMANCEWIRELESSSYSTEMS
ISSN
1536-1276
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
URI
http://hdl.handle.net/20.500.11750/4628
DOI
10.1109/TWC.2017.2756044
Publisher
Institute of Electrical and Electronics Engineers Inc.
Files in This Item:

There are no files associated with this item.

Appears in Collections:
Department of Electrical Engineering and Computer Science ISC(Information Security and Communication) Lab 1. Journal Articles

qrcode

  • twitter
  • facebook
  • mendeley

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE