Body movement cancellation using adaptive filtering technology for radar-based vital sign monitoring

Noise due to body movement is a critical challenge for noncontact vital signs detection. This paper presents an adaptive filter-based body movement cancellation solution that does not require any hardware modification to a conventional continuous-wave (CW) Doppler biomedical radar. When a body movement is detected, the recently detected segments without body movement is used as the reference to process the segment corrupted by body movement with an adaptive filter. The result suggests that the proposed method can reduce the impact of body movement on vital signs monitoring.