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Comparison of Massive MIMO and Small Cells in HetNet with LoS and NLoS Transmissions

Title
Comparison of Massive MIMO and Small Cells in HetNet with LoS and NLoS Transmissions
Authors
Zhang, QiYang, Howard H.Quek, Tony Q. S.Lee, Je Min
DGIST Authors
Lee, Je Min
Issue Date
2017-12-06
Citation
2017 IEEE Global Communications Conference, GLOBECOM 2017, 1-6
Type
Conference
ISBN
9781509050192
ISSN
0000-0000
Abstract
We develop a framework for downlink heteroge- neous cellular networks with line-of-sight (LoS) and non-line- of- sight (NLoS) transmissions. Using stochastic geometry, we derive a tight approximation of the achievable downlink rate that enables us to compare the performance between densifying small cells and expanding base station (BS) antenna arrays. Interestingly, we find that adding small cells into a sparse network improves the achievable rate much faster than expanding antenna arrays at the macro BS. However, when the small cell density exceeds a critical threshold, the spacial densification will lose its benefits and further impair the network capacity. To this end, we present the optimal small cell density that maximizes the rate as practical deployment guidance. In contrast, expanding macro BS antenna array can always increase the capacity until reaching an upper bound caused by pilot contamination, and this bound also surpasses the peak rate obtained from deployment of small cells. Therefore, small cells are preferred for low rate requirements due to the rapid rate gain, and the massive MIMO is preferred for higher rate requirements due to better achievable rate. © 2017 IEEE.
URI
http://hdl.handle.net/20.500.11750/6364
DOI
10.1109/GLOCOM.2017.8254887
Publisher
Institute of Electrical and Electronics Engineers Inc.
Files:
There are no files associated with this item.
Collection:
Department of Information and Communication EngineeringISC(Information Security and Communication) Lab2. Conference Papers


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