A method and system for enhancing respiratory signals in interference scenarios

Abstract

The present invention provides a method and system for enhancing a respiratory signal in an interference scenario, belonging to the field of respiratory sensing technology. The method comprises the following steps: pre-processing CSI signals received by receiving antennas, calculating optimal projection angle intervals of CSI signals of different subcarriers according to human body positions based on a linear projection rule, projecting each subcarrier in each projection system to obtain a projection waveform, taking the projection system with the largest sum of BNR values ​​of the projection waveforms as the optimal projection system, and obtaining a position-enhanced respiratory signal; segmenting the system into multiple segmented waveforms, performing short projection transformation and strong filtering on each segmented waveform using a loop operation, obtaining segmented waveforms after short window transformation, and splicing the waveforms to obtain a secondary enhanced respiratory signal; calculating PAR values ​​and BNR values ​​of the secondary enhanced respiratory signal, screening out a plurality of optimal receiving antennas using the PAR×BNR value as an indicator, calculating the average value of autocorrelation estimates of the optimal receiving antennas, and obtaining a respiratory rate estimate; and improving the robustness of respiratory monitoring in interference scenarios.

Images