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Multi-Dimensional Constellation for OTFS-based Vehicular-IoT
Multi-Dimensional Constellation for OTFS-based Vehicular-IoT
A cutting-edge research project focused on enhancing wireless communication for high-mobility Vehicular IoT (V-IoT) systems using Orthogonal Time Frequency Space (OTFS) modulation with multi-dimensional signal constellations. The work addresses challenges in 5G/B5G networks, such as Doppler spread and bit error rate (BER) performance, by optimising signal mapping in higher-dimensional spaces.
Key Contributions
Designed N-Dimensional (N-D) signal constellations (e.g., 3D-256QAM) using heuristic optimization to maximize Minimum Euclidean Distance (MED), improving BER at higher modulation orders.
Proposed an ND-OTFS-based V-IoT system compatible with 5G NR, eliminating complex LDPC coding to reduce receiver complexity.
Demonstrated SNR gains of up to 15 dB for 256-QAM in mmWave channels at 500 km/h vehicle speeds.
Validated robustness in diverse channels (EPA, ETU, EVA, mmWave) under extreme Doppler conditions.
Outcomes:
Ch Santosh Reddy, Debarati Sen, Low-Complex, Reliable Multidimensional Orthogonal Time Frequency Space (ND-OTFS) Modulation-Based Communication System,
Indian Patent Application No. 202431046217, published on 20-06-2024
United States Patent, Publication No.: 19/022,529, dated 15-01-2025
Ch Santosh Reddy, Preety Priya, Debarati Sen, Chetna Singhal, Spectral Efficient Modem Design with OTFS Modulation for Vehicular-IoT System, IEEE Internet of Things Journal, vol. 10, no. 3, pp. 2444-2458, 1 Feb.1, 2023, DOI: 10.1109/JIOT.2022.3211531. [Paper]
Ch Santosh Reddy, Debarati Sen, Chetna Singhal, Performance Analysis of NR-based Vehicular IoT System with OTFS Modulation, 2021 IEEE 94th Vehicular Technology Conference (VTC2021-Fall). Sep 27, 2021. [Paper]
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