Distributed Antenna Fabrics for Cell-Free Massive MIMO Sensing

ISACFabric formalizes distributed antenna array fabrics, cell-free massive MIMO cooperative radar, spatial interference nulling, and reconfigurable intelligent surfaces (RIS) into deployable engineering blueprints for industrial and smart-city sensing networks.

ISACFabric Cell-Free Massive MIMO Architecture

ISAC Core: Fabric Core — Cell-Free MIMO & Spatial Nulling

6G ISAC Nodes & Beamforming Subsystems

Distributed Radio Access Point
Reconfigurable Intelligent Surface (RIS)
Zero-Forcing Spatial Nuller
Cooperative Multi-Static Lens
Context-Aware Energy Sleeper

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)

Cell-Free Massive MIMO & Metasurfaces in ISACFabric

Traditional cellular deployments suffer sharp coverage and sensing degradation at cell boundaries. ISACFabric replaces centralized macro-towers with a continuous mesh of distributed, phase-synchronized radio access points spanning industrial facilities and smart-city districts, letting the entire fabric behave as one coherent, multi-static radar lens.

Core Engineering Areas

Cell-Free Massive MIMO and Cooperative Radar Imaging — Dozens of low-power access points share a common clock and fiber backhaul, eliminating cell-edge dropouts while jointly imaging targets from multiple angles.
Spatial Interference Nulling in High-Density Fabrics — Precoding weights are computed in real time to steer deep nulls toward neighboring sensing nodes, letting high-power data beams and sensitive radar receivers share spectrum without desensitizing each other.
Reconfigurable Intelligent Surfaces (RIS) and Metasurfaces — Wall-mounted, low-power reflective metasurfaces redirect sub-terahertz communication and radar beams around concrete pillars and corners, extending coverage into shadow zones without adding active transceivers.