A Tractable Approach to Uplink Spectral Efficiency of Two-Tier Massive MIMO Cellular HetNets

Wen Liu, Shi Jin, Chao-Kai Wen, Michail Matthaiou, Xiaohu You

Research output: Contribution to journalLetterpeer-review

15 Citations (Scopus)
261 Downloads (Pure)

Abstract

This letter investigates the uplink spectral efficiency (SE) of a two-tier cellular network, where massive multiple-input multiple-output macro base stations are overlaid with dense small cells. Macro user equipments (MUEs) and small cells with single user equipment uniformly scattered are modeled as two independent homogeneous Poisson point processes. By applying stochastic geometry, we analyze the SE of the multiuser uplink at a macro base station that employs a zero-forcing detector and we obtain a novel lower bound as well as its approximation. According to the simple and near-exact analytical expression, we observe that the ideal way to improve the SE is by increasing the MUE density and the base station antennas synchronously rather than increasing them individually. Furthermore, a large value of path loss exponent has a positive effect on the SE due to the reduced aggregated interference.
Original languageEnglish
Pages (from-to)348-351
Number of pages4
JournalIEEE Communications Letters
Volume20
Issue number2
Early online date25 Nov 2015
DOIs
Publication statusPublished - Feb 2016

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