An Efficient Polar Coding Scheme for Uplink Data Transmission in Narrowband Internet of Things Systems

Rabiu Sale Zakariyya,Oluwole John Famoriji,Fujiang Lin,Khalid Hossen Jewel,Akinwale O Fadamiro

doi:10.1109/access.2020.3032636

Rabiu Sale Zakariyya, Oluwole John Famoriji + Show 3 more

Open Access

https://doi.org/10.1109/access.2020.3032636

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Abstract

Narrowband Internet of Things (NB-IoT) is an emerging IoT cellular-based wireless technology that builds based on the existing LTE standard to extend its network coverage suited for Low Power Wide Area Network (LPWAN) connectivity. In the NB-IoT system, LTE turbo codes and Cyclic Redundancy Check (CRC) codes are adopted as the main channel coding technique for Narrowband Physical Uplink Shared Channel (NPUSCH). However, turbo codes require iterative decoding algorithm at the expense of high computation complexity of decoding hence is crucial to achieving the LPWAN requirement of NB-IoT systems. Polar codes are best suited in this regard due to its capacity approaching and complexity reduction in short block length code. In this paper, we proposed an efficient polar coding technique using the Belief Propagation (BP) decoding algorithm for uplink data transmission on the NPUSCH channel. Furthermore, the BP algorithm is incorporated with the CRC stoppage criterion to decrease the number of decoding iteration and reduce computational complexity. In this scheme, single-tone numerology of NPUSCH using 3.75 kHz and 15 kHz subcarrier spacing is adopted. Then, the encoded data is generated with different NPUSCH resources. The theoretical formulation and simulation demonstrate that the proposed scheme provides better error rate performance over the adopted LTE turbo codes and other polar decoding algorithms while reducing the computational complexity.

Highlights

In the recent decade of wireless connectivity, the Internet of things (IoT) technology has recently become the modern communication technology due to its involvement in smart connected applications such as smart cities, e-health, precision agriculture, and much more [1]-[3]
SIMULATION RESULTS we present the numerical computation in terms of block error rate (BLER) of our polar coding scheme for uplink NBIoT systems under various Narrowband Physical Uplink Shared Channel (NPUSCH) conditions
The transmission reliability of NPUSCH is the main focus in our simulation which targets to minimize the BLER so that NBIoT users can simultaneously upload their data on NPUSCH efficiently with a high degree of reliability

Summary

Introduction

In the recent decade of wireless connectivity, the Internet of things (IoT) technology has recently become the modern communication technology due to its involvement in smart connected applications such as smart cities, e-health, precision agriculture, and much more [1]-[3]. Rapid demand IoT devices have grown in wireless technology requiring efficient transmission for low power consumption, low cost, and low complexity in terms of implementation. In 20’s, it is forecasted that over 100 billion connected devices will be enabled thereby generating huge amount revenue [2], [4], [5] To meet this demand, the 3rd Generation Partnership Project (3GPP) has set another communication standard for IoT as part of Release 13 (Rel-13) called the Narrowband IoT (NB-IoT) [6] which regarded as the key enablers in Fifth Generation (5G) technology that designed to offer IoT service within which Long Term Evolution (LTE) and WLAN are failed. It is expected to achieve long-lasting of battery life (least 10years), enhanced coverage

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