Pushing the Limits of Long Range Wireless Sensing with LoRa
summary
Paper claims LoRa-based system extends contact-free walking sensing from ~50 m to 120 m and achieves respiration sensing at 75 m, even through seven concrete walls. It implements a signal ratio step to remove random phase offsets, enlarges movement-induced phase changes by adding a vector (Vadd) to reduce the static-path amplitude, and applies time-domain beamforming by subsampling, aligning, and summing replicas to boost signal and suppress noise. Experiments on a football field and a hallway validate the numbers.
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