Energy Efficiency and Sum Rate when Massive MIMO meets Device-to-Device Communication

TL;DR

This paper analyzes the tradeoffs between energy efficiency and sum rate in a cellular network with massive MIMO and D2D communication, deriving expressions to optimize system performance.

Contribution

It introduces a comprehensive model combining massive MIMO and D2D communication, providing new insights into their joint impact on energy efficiency and sum rate.

Findings

Optimal number of BS antennas for energy efficiency

Impact of D2D user density on sum rate

Tradeoff curves between energy efficiency and sum rate

Abstract

This paper considers a scenario of short-range communication, known as device-to-device (D2D) communication, where D2D users reuse the downlink resources of a cellular network to transmit directly to their corresponding receivers. In addition, multiple antennas at the base station (BS) are used in order to simultaneously support multiple cellular users using multiuser or massive MIMO. The network model considers a fixed number of cellular users and that D2D users are distributed according to a homogeneous Poisson point process (PPP). Two metrics are studied, namely, average sum rate (ASR) and energy efficiency (EE). We derive tractable expressions and study the tradeoffs between the ASR and EE as functions of the number of BS antennas and density of D2D users for a given coverage area.