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<p>Orthogonal Time Frequency Space <b>(</b>OTFS), a 6G modulation technique designed to meet the demands of high-speed applications in Delay-Doppler scenarios. Due to its inherent capabilities, it is applicable in various communication fields, including vehicular technology, high-speed train systems, and the IoT (Internet of Things). As the necessitate for OTFS systems increases, there is a need to enhance their capacity for users to accommodate in large number. Index Modulation Multiple Access (IMMA) is an efficient scheme that utilizes the same Delay-Doppler resources for multiple users, thereby optimizing spectrum usage. Conversely, an efficient MIMO scheme, Quadrature Spatial Modulation (QSM) that transmits information through active antennas using quadrature spatial constellations. This article proposes a QSM-OTFS-based IMMA to improve spectrum efficiency for multiple users in high mobility scenario. Simulations conducted for the proposed scheme demonstrate its superiority over conventional methods and its resilience under varying conditions.</p>

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Enhanced Orthogonal Time Frequency Space with Quadrature Spatial Modulation and Index Modulation Multiple Access for High Mobility Communications

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • R. Jayashri,
  • Govindaraj Ramkumar

摘要

Orthogonal Time Frequency Space (OTFS), a 6G modulation technique designed to meet the demands of high-speed applications in Delay-Doppler scenarios. Due to its inherent capabilities, it is applicable in various communication fields, including vehicular technology, high-speed train systems, and the IoT (Internet of Things). As the necessitate for OTFS systems increases, there is a need to enhance their capacity for users to accommodate in large number. Index Modulation Multiple Access (IMMA) is an efficient scheme that utilizes the same Delay-Doppler resources for multiple users, thereby optimizing spectrum usage. Conversely, an efficient MIMO scheme, Quadrature Spatial Modulation (QSM) that transmits information through active antennas using quadrature spatial constellations. This article proposes a QSM-OTFS-based IMMA to improve spectrum efficiency for multiple users in high mobility scenario. Simulations conducted for the proposed scheme demonstrate its superiority over conventional methods and its resilience under varying conditions.