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Beam-Domain Channel Modelling for B5G: OAM Beamforming in High-Mobility Scenarios
A cutting-edge Beam-Domain Channel Model (BDCM) for Beyond 5G (B5G) systems, leveraging Orbital Angular Momentum (OAM) beamforming and Uniform Circular Arrays (UCAs) to address high-mobility challenges (up to 1000 km/h). This work transforms traditional Geometry-Based Stochastic Models (GBSM) into a sparse beam-domain representation, enhancing spectral efficiency and reliability in accelerating vehicular scenarios.
Key Innovations
Beam-Domain Transformation:
Derived beamforming matrices to convert GBSM into BDCM, enabling efficient beam sampling and reducing channel estimation complexity.
Designed a Bessel compensation filter to counteract multipath-induced OAM mode degradation.
OAM Beamforming for UCAs:
Developed steering vectors and OAM wave vectors for massive MIMO UCAs, optimizing spatial multiplexing in dynamic environments.
Incorporated acceleration-induced Doppler shifts and delays for realistic vehicular channel modeling.
Statistical Validation:
Analyzed Temporal Autocorrelation (TACF), Doppler spectra, and Singular Value Spread (SVS) to demonstrate BDCM’s robustness under mobility.
Results & Impact:
Stability: BDCM maintained consistent beam patterns vs. GBSM’s rapid fluctuations, improving coherence time by 10× at 1000 km/h.
Capacity Gains: Achieved higher channel capacity with uniform power allocation, outperforming GBSM by 15–20% in simulated urban micro (UMi) scenarios.
Practical Relevance: Validated using 3GPP CDL-D channel data at 28 GHz, aligning with 6G requirements for ultra-reliable vehicular communications.
Outcomes:
Phinehas Chinthalagattu, Ch Santosh Reddy, Debarati Sen, "Method and Architecture for Doppler Resistant Hybrid Mode Domain Beamforming in High Mobility Wireless Networks," Patent Application No. 22112, submitted IP Cell of IIT Kharagpur, Aug 5, 2025.
Phinehas Chinthalagattu, Ch Santosh Reddy, Debarati Sen, ”Beam-Domain Channel Analysis for B5G Communication Systems Using OAM Beamforming,” 2025 IEEE 101st Vehicular Technology Conference (VTC2025-Spring), accepted. [Paper]
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