PCA Based Noise Reduction Changes in CSI streams caused by human movementare correlated Theoretically proved Experimentally validated NxM×30 CSI streams 30 subcarriers …↑↑11 Phase changes by 2 Noises present in all streams 150 100 50 2.5 2.552.62.652.72.752.82.852.92.95 Time(seconds) 9/969/96 PCA Based Noise Reduction § Changes in CSI streams caused by human movement are correlated – Theoretically proved – Experimentally validated