OTFS-MDMA: An Elastic Multi-Domain Resource Utilization Mechanism for High Mobility Scenarios
Jie Chen, Xianbin Wang, and Lajos Hanzo

TL;DR
This paper introduces an elastic multi-domain resource utilization mechanism for OTFS-MDMA systems, optimizing multi-user access and resource allocation to improve performance in high-mobility scenarios.
Contribution
It proposes a novel multi-user OTFS-MDMA framework that dynamically allocates delay-Doppler, power, and spatial resources, with optimized user assignment and access schemes.
Findings
Enhanced spectrum efficiency through adaptive MA selection.
Global optimality achieved via DPMO method in specific cases.
Effective sub-optimal algorithms for general scenarios.
Abstract
By harnessing the delay-Doppler (DD) resource domain, orthogonal time-frequency space (OTFS) substantially improves the communication performance under high-mobility scenarios by maintaining quasi-time-invariant channel characteristics. However, conventional multiple access (MA) techniques fail to efficiently support OTFS in the face of diverse communication requirements. Recently, multi-dimensional MA (MDMA) has emerged as a flexible channel access technique by elastically exploiting multi-domain resources for tailored service provision. Therefore, we conceive an elastic multi-domain resource utilization mechanism for a novel multi-user OTFS-MDMA system by leveraging user-specific channel characteristics across the DD, power, and spatial resource domains. Specifically, we divide all DD resource bins into separate subregions called DD resource slots (RSs), each of which supports a…
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Taxonomy
TopicsAlgorithms and Data Compression · Advanced Data Compression Techniques · Network Security and Intrusion Detection
