Exploiting Short Block and Concatenated Codes for Reliable Communications within the Coexistence of 5G-NR-U and WiFi

Azeem, Moazam and Abozariba, Raouf and Asyhari, A. Taufiq (2022) Exploiting Short Block and Concatenated Codes for Reliable Communications within the Coexistence of 5G-NR-U and WiFi. Transactions on Vehicular Technology. ISSN 0018-9545

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Unlicensed spectrum offers opportunities for cellular mobile network operators, where traffic can be offloaded from licensed to unlicensed bands. Modern heterogeneous technologies such as 5G New Radio (NR) and WiFi can simultaneously operate on ISM and UNII bands under strict coexistence rules. While satisfying harmonious coexistence has largely been studied in LTE/4G, an emerging issue for future deployment is to reduce latency and to guarantee reliable communications, in the direction of achieving URLLC. This work mainly focuses on the critical issues arising in the coexistence of Listen Before Talk (LBT) systems, sharing common infrastructure of 5G NRU and WiFi when operating under imperfect energy detection sensing. We consider the application of short, concatenated and product erasure correcting codes to recover missing data in LBT-based systems due to collisions. The goal is to enhance spectrum utilization with reduced delay and to achieve reliable communications under LBT and various sensing impairments, with code parameters such as block length, rate and minimum distance. By means of concatenation, we construct a series of sophisticated erasure block codes with less decoding complexity using Tanner Graph based decoding. Furthermore, we develop an analytical model to derive a closed-form expression using Gaussian approximation of spectrum utilization efficiency. The efficiency achieved using short, concatenated and product block codes is compared with the various low-density parity-check (LDPC) correcting ensembles under various levels of user activities, built by two state Gilbert-Elliott model. We provide detailed comparisons in respect of global throughput and failure probability of codes under varied number of coexisting users. Our results show that the proposed codes can achieve at least 20% higher efficiency at 0.1 false alarm probability and 30% less failure probability under high contention scenarios.

Item Type: Article
Identification Number: https://doi.org/10.1109/TVT.2022.3208933
8 September 2022Accepted
24 November 2022Published Online
Uncontrolled Keywords: Codes, Wireless fidelity, 5G mobile communication, Decoding, Sensors, Bandwidth, Interference
Subjects: CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-01 - engineering (non-specific)
Divisions: Faculty of Computing, Engineering and the Built Environment > School of Computing and Digital Technology
Depositing User: Raouf Abozariba
Date Deposited: 17 Nov 2022 12:07
Last Modified: 08 Dec 2022 13:34
URI: https://www.open-access.bcu.ac.uk/id/eprint/13742

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