Year: 2025
Type: article
Abstract: This letter introduces Non-Orthogonal Time Frequency Space Index Modulation Multiple Access (NOTFS-IMMA), an enhanced uplink random access scheme that integrates Non-Orthogonal Multiple Access (NOMA) with Orthogonal Time Frequency Space (OTFS) and Index Modulation Multiple Access (IMMA). In NOTFS-IMMA, users randomly select delay-Doppler resource blocks based on portions of their data, enabling grant-free access without coordination, thus improving energy efficiency. Analytical and simulation results demonstrate that NOTFS-IMMA outperforms both traditional OTFS multiple access and OTFS-IMMA in terms of bit error rate and spectral efficiency.
Institution: Kumoh National Institute of Technology
Language: English
Topic: PAPR reduction in OFDM
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,645
OpenAlex ID: W4407830442