BDCM

Channel | Beam | Patents

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:

1. Phinehas Chinthalagattu, Ch Santosh Reddy, Debarati Sen, Method and Architecture for Doppler Resistant Hybrid Mode Domain Beamforming in High Mobility Wireless Networks,
  - India patent application no. 202631053025, published on 24-04-2026.
2. 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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