Description
MIMO radar uses multiple TX and RX antennas to synthesise a virtual aperture larger than the physical array. Combined with fmcw-radar modulation it produces high-resolution range-Doppler-angle observations on a single chip. It is the de-facto reference for mmWave indoor people counting and the modality that WiFi sensing aspires to match in resolution.
When it's used
- High-angular-resolution indoor radar people counting
- Reference benchmark against
wifi-csi-sensing - Multi-target separation in crowded environments
Limitations
- TX/RX calibration overhead grows with array size
- Coupling between channels needs careful suppression
- Hardware not yet ubiquitous like Wi-Fi