ISACSim 3D Ray-Tracing Electromagnetic Waveform & Multipath Simulation

ISACSim provides GPU-accelerated shooting-and-bouncing ray (SBR) electromagnetic simulation engines for complex 6G environments, modeling multi-bounce reflections, diffuse scattering, and target micro-Doppler.

ISACSim GPU Ray-Tracing & Propagation Engine

ISAC Core: ISACSim Core — GPU Ray-Caster & SBR Waveform Engine

6G ISAC Nodes & Beamforming Subsystems

Shooting-and-Bouncing Rays (SBR)
Material Dielectric Database
Micro-Doppler Clutter Synthesizer
Full-Wave FEM/FDTD Interlock
Synthetic CSI / Echo Stream Export

Architectural Layers & Waveform Pipelines

Layer 1: Dual-Functional Waveform & Baseband (OTFS / OFDM-Radar / Fractional Fourier Transform / Ambiguity Function): Orthogonal Time Frequency Space (OTFS) modulation and fractional chirp synthesis achieving zero inter-carrier interference under severe Doppler spreads.
Layer 2: Massive MIMO & Beamforming Frontends (140 GHz D-Band / True-Time-Delay (TTD) / Hybrid Analog-Digital Beamforming): Sub-THz active phased array architectures with true-time-delay beam-squint mitigation, simultaneous communication data beams and pencil radar tracking lobes.
Layer 3: Radar Signal Processing & 4D Point Cloud (2D-FFT Range-Doppler / MUSIC AoA / CFAR Detection / Micro-Doppler Extraction): Sub-decimeter range and velocity resolution, constant false-alarm rate (CFAR) detection, and micro-Doppler biomechanical gait and drone propeller classification.
Layer 4: Network Sensing Orchestration & 3GPP Rel-19 (3GPP Rel-19 ISAC Core / Sensing Function (SF) / Reconfigurable Intelligent Surfaces (RIS)): Cell-free collaborative radar networks, dynamic time-frequency resource allocation balancing communication SLA against radar revisit time.

Sensing Telemetry & Benchmarks: <5 cm (Range Resolution) | 0.1 m/s (Velocity Precision) | <10 ms (Radar Frame Latency) | 3GPP Rel-19 (Global Standard)

GPU 3D Ray-Tracing & Waveform Propagation in ISACSim

Designing millimeter-wave and sub-THz dual-functional waveforms requires exact physical modeling of propagation channels. Urban street canyons, automotive interiors, and smart factories exhibit dense multipath reflections that degrade communications while generating clutter for radar. ISACSim models every ray interaction using physical optics (PO) and the uniform theory of diffraction (UTD) on modern GPU clusters.

Core Engineering Areas

GPU-Accelerated Shooting-and-Bouncing Rays (SBR) Simulation — Simulating billions of electromagnetic ray paths per second across dense urban geometry using NVIDIA OptiX and CUDA RT cores.
Dielectric Material Modeling and Diffuse Surface Scattering — Accurate modeling of real-world materials including reinforced concrete, low-emissivity glass, asphalt, and vegetation at sub-THz frequencies.
End-to-End ISAC Link-Level and System-Level Digital Prototyping — Exporting synthetic channel matrices and raw radar ADC data cubes directly into MATLAB, Python, and C++ baseband algorithmic pipelines.