Downlink Beamforming for Energy-Efficient Heterogeneous Networks with Massive MIMO and Small Cells

Long Nguyen, Hoang Duong Tuan, Quang Duong, Octavia A. Dobre, H. Vincent Poor

Research output: Contribution to journalArticle

21 Citations (Scopus)
178 Downloads (Pure)

Abstract

A heterogeneous network (HetNet) of a macrocell base station equipped with a large-scale massive multi-in multi-out (MIMO) antenna array overlaying a number of small cell base stations (small cells) can provide high quality of service (QoS) to multiple users under low transmit power budget. However, the circuit power for operating such a network, which is proportional to the number of transmit antennas, poses a problem in terms of its energy efficiency (EE). This paper addresses the beamforming design at the base stations to optimize the network EE under the QoS constraints and a transmit power budget. Beamforming tailored for weak, strong, and medium cross-tier interference HetNets is proposed. In contrast to the conventional transmit strategy for power efficiency in meeting the users' QoS requirements, which suggest the use of a few hundred antennas, it is found out that the overall network EE quickly drops if this number exceeds 50. It is found that, for a given number of antennas, HetNet is more energy efficient than massive MIMO when considering the overall energy consumption.

Original languageEnglish
Pages (from-to)3386-3400
Number of pages15
JournalIEEE Trans on Wireless Communications
Volume17
Issue number5
DOIs
Publication statusPublished - 08 May 2018

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