Enabling Wireless Power Transfer and Multiple Antennas Selection to IoT Network Relying on NOMA

"Si-Phu Le,Minh-Sang Van Nguyen,Hong-Nhu Nguyen,Ngoc-Long Nguyen,Miroslav Voznak,Dinh-Thuan Do,Nhat-Tien Nguyen

doi:10.5755/j01.eie.26.5.27889

Abstract

Wireless Power Transfer (WPT) is a significant technique for Internet of Things (IoT) networks. Recently, more interest has been focused on multiple access technique without orthogonal signals for wireless communication. Non-orthogonal Multiple Access (NOMA) scheme is proposed to allow users the access point in IoT network. In this paper, we propose the power beacon which is able to feed energy to power-constraint relay node to further support transmission from the source to destinations in IoT networks. In this article, a NOMA system is benefited by with WPT and antenna selection technique. The system improvement can be achieved through the exact closed-form expressions of outage probability (OP). The performance gap among two users is evaluated using model of the Rayleigh fading channels. Furthermore, we compare NOMA with traditional scheme to highlight advantage of such IoT system.

Highlights

It has been predicted that Internet will be connected by 50 billion of devices, including small sensors or Internet of Things (IoT) devices, by 2020 [1]
We show the comparisons of IoT system related outage performance of two users using Nonorthogonal Multiple Access (NOMA) and Orthogonal Multiple Access (OMA)
The outage probability versus the transmit signal to noise ratio (SNR) at the access point (AP) is illustrated in Fig. 2, where we consider two main scenarios, i.e., NOMA and OMA

Summary

INTRODUCTION

It has been predicted that Internet will be connected by 50 billion of devices, including small sensors or IoT devices, by 2020 [1]. It is noted that there is higher demand to remain operation of huge number of sensors, especially providing selfsustainable green communications for IoT networks since devices are limited energy [8]. These power-constraint sensors need their lifetime to be extended, and it requires possible solution of energy efficient data transmission. The IoT benefits from power beacon, and some metrics are studied to exhibit system performance [18] Motivated by these papers [16,17,18], we formulate the problem of selection of beacon and antenna selection to evaluate outage performance of two NOMA users.

SYSTEM MODEL

OUTAGE PERFORMANCE ANALYSIS FOR NOMA

Outage Analysis at D1

OUTAGE PERFORMANCE OF OMA

NUMERICAL RESULTS