Performance Analysis of Multi-User Downlink PD-NOMA Under SUI Fading Channel Models

Asif Mahmood,Sajjad Hussain,Muhammad Zeeshan,Sagheer Khan

doi:10.1109/access.2021.3070147

Abstract

Power Domain Non Orthogonal Multiple Access (PD-NOMA) is a multiple access technique that offers spectral efficiency, low latency and user fairness in 5G networks. This paper evaluates the performance of multi-user downlink PD-NOMA in suburban environments under SUI fading channels. Baseband modulated user signals with phase shifts are allocated power levels in accordance with users distance before the superposition coding is performed at the base station. A multi-level successive interference cancellation (SIC) is performed at the receivers. Bit error rate (BER) performance against signal-to-noise ratio (SNR) for up to four users per cluster is compared for all the SUI models corresponding to different suburban terrains with varying vegetation densities. An upper limit on number of users per cluster that are supported at a benchmark BER and SNR values is also evaluated.

Highlights

The development of 5th Generation (5G) communication systems is envisioned to match the increasing network capacity demands [1]. 4G communication systems utilized Orthogonal Multiple Access scheme (OMA) which works in Orthogonal Frequency Division Multiple Access (OFDMA) or Single Carrier-Frequency Division Multiple Access (SC-FDMA) [2], [3]
The OMA scheme fails to provide diverse range of Quality of Service (QoS) in large users network. This is due to the finite Degrees of Freedom (DoF) in such networks where users with rich channel conditions are served on priority basis whereas the users with poor channel conditions must wait for services [4]
In order to fulfil the demands of users in 5G networks, Non-Orthogonal Multiple Access (NOMA) schemes with superposition coding at the transmitter and Successive Interference Cancellation (SIC) [5], [6] at the receivers are being investigated

Summary

Introduction

The development of 5th Generation (5G) communication systems is envisioned to match the increasing network capacity demands [1]. 4G communication systems utilized Orthogonal Multiple Access scheme (OMA) which works in Orthogonal Frequency Division Multiple Access (OFDMA) or Single Carrier-Frequency Division Multiple Access (SC-FDMA) [2], [3]. The development of 5th Generation (5G) communication systems is envisioned to match the increasing network capacity demands [1]. The OMA scheme fails to provide diverse range of Quality of Service (QoS) in large users network. This is due to the finite Degrees of Freedom (DoF) in such networks where users with rich channel conditions are served on priority basis whereas the users with poor channel conditions must wait for services [4]. In order to fulfil the demands of users in 5G networks, Non-Orthogonal Multiple Access (NOMA) schemes with superposition coding at the transmitter and Successive Interference Cancellation (SIC) [5], [6] at the receivers are being investigated.

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Conclusion