Index Coded - NOMA in Vehicular Ad Hoc Networks

• Published in: IEEE transactions on vehicular technology Vol. 71; no. 9; pp. 10073 - 10087
• Main Authors: Pazhoor, Sreelakshmi, Pachat, Jesy, Mahesh, Anjana Ambika, P. P., Deepthi, Rajan, B. Sundar
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bandwidth; Caching; Codes; Efficiency; Encoding; Feasibility studies; index coding; Indexes; Integrated circuits; Mobile ad hoc networks; Multimedia; NOMA; Non-orthogonal multiple access; Nonorthogonal multiple access; Receivers; vehicular communications; Wireless communications
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2022.3182891

The demand for multimedia services is growing day by day in vehicular ad hoc networks (VANETs), resulting in high spectral usage and network congestion. Non-orthogonal multiple access (NOMA) is a promising wireless communication technique to solve the problems related to spectral efficiency effectively. The index coding (IC) is a powerful method to improve spectral utilization, where a sender aims to satisfy the needs of multiple receivers with a minimum number of transmissions. By combining these two approaches, in this work, we propose a novel technique called index coded NOMA (IC-NOMA), where we apply NOMA techniques on index coded data to reduce the number of transmissions further. This work shows that the IC-NOMA system demands a specific design for index codes to reap the advantages of NOMA. We have done the feasibility analysis of the proposed method in a general scenario and proposed an index code design to integrate IC over NOMA for the best efficiency. Through detailed analytical studies it is validated that the proposed transmission system provides improved spectral efficiency and power saving compared to conventional IC systems.