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Orbital Angular Momentum (OAM) and Multi-Dimensional Constellation for Beyond 5G Systems
Orbital Angular Momentum (OAM) and Multi-Dimensional Constellation for Beyond 5G Systems
A novel waveform design for 5G and beyond systems, leveraging Orbital Angular Momentum (OAM) modes and multi-dimensional constellations to improve spectral efficiency and reliability in high-mobility environments. Developed under the Next Generation Wireless Research and Standardization on 5G and Beyond program, supported by the Ministry of Electronics and Information Technology, India.
Key Contributions
Innovative Waveforms: Proposed OTFSM (Orthogonal Time Frequency Space Mode) and OTSMM (Orthogonal Time-Sequency Mode Multiplexing) for robust communication in dynamic channels.
Multi-Dimensional Signal Mapping: Designed N-dimensional constellations to maximize the minimum Euclidean distance (MED), enhancing bit error rate (BER) performance.
Low-Complexity Receiver: Eliminated the need for traditional equalizers by leveraging OAM orthogonality and precoding techniques.
Results & Impact
Performance Gains: Achieved up to 7.5 dB SNR improvement for 16-QAM in high-mobility scenarios.
Spectral Efficiency: Demonstrated 80 bits/s/Hz capacity with 8 OAM modes, outperforming conventional MIMO-OTFS systems.
Applications: Suitable for autonomous vehicles, IoT networks, and urban 5G deployments.
Outcomes:
Ch Santosh Reddy, Debarati Sen, An Orthogonal Time Frequency Space Mode (OTFSM) Waveform Based Wireless Communication System and A Method Thereof, India patent application no. 202531050583, published on 26-05-2025.
Ch Santosh Reddy, Debarati Sen, ”Enhanced Capacity and Reliability with OAM and Multi-Dimensional Constellation over Time-Variant Channel for Beyond 5G Systems,” IEEE Transaction on Wireless Communication, 10.1109/TWC.2025.3558643. [Paper]
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