Index coding (IC) is a source coding technique employed to improve spectral utilisation, where the source node aims to satisfy users' demands by making minimum transmissions. Non-orthogonal multiple access (NOMA) is integral to the radio access technique used in 5G networks. Index-coded NOMA (IC-NOMA) transmission scheme in Vehicular Adhoc Networks (VANETs) involves applying NOMA principles on index-coded data to avoid network congestion and to improve spectral efficiency compared to conventional IC systems. In this work, a spectral efficient transmission scheme called 3-Group IC-NOMA is proposed, and an innovative index code design that fits with NOMA decoding principles to obtain improved spectral efficiency is developed. Through exhaustive analytical studies, we demonstrate that the proposed transmission scheme always supports higher rates than the conventional IC systems and requires less power to achieve an information rate at least as good as conventional IC systems.
翻译:指数编码(IC)是一种源编码技术,旨在改善频谱利用率,源节点通过进行最少的传输来满足用户的需求。 非正交多址接入(NOMA)是5G网络中使用的无线电接入技术的一部分。在车联网(VANETs)中应用指数编码的NOMA(IC-NOMA)传输方案涉及将NOMA原则应用于指数编码数据,以避免网络拥塞并提高比传统IC系统的频谱效率。在此研究中,提出了一种称为3-Group IC-NOMA的频谱效率传输方案,并开发了与NOMA解码原则相适应的创新指数码设计,以获得更高的频谱效率。通过详尽的分析研究,我们证明所提出的传输方案始终支持比传统IC系统更高的速率,并且需要更少的功率才能实现至少与传统IC系统同样好的信息速率。