A low-cost eight-antenna WiFi channel sounder built from ESP32 chips achieves phase coherence through a shared reference clock and an injected WiFi-based phase reference signal.
Lightweight and Standalone IoT Based WiFi Sensing for Active Repositioning and Mobility,
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ESPARGOS: An Ultra Low-Cost, Realtime-Capable Multi-Antenna WiFi Channel Sounder
A low-cost eight-antenna WiFi channel sounder built from ESP32 chips achieves phase coherence through a shared reference clock and an injected WiFi-based phase reference signal.