Motivation Modeling Design Experiments Conclusions Limitations of Prior Arts Limitations of Prior Arts:no model(signal,activity) So,have to rely on statistical characteristics of WiFi signals So,sensitive to environmental changes signals Our Approach:model(signal,speed)+model(signal,activity) Robust to environmental changes High recognition accuracy h rIW 115 Time(seconds) Dac 4/24
Motivation Modeling Design Experiments Conclusions Limitations of Prior Arts Limitations of Prior Arts: no model (signal, activity) • So, have to rely on statistical characteristics of WiFi signals • So, sensitive to environmental changes signals Our Approach: model(signal, speed)+model(signal, activity) • Robust to environmental changes • High recognition accuracy 11 11.5 12 12.5 60 65 70 75 CSI Time (seconds) 4/24
Motivation Modeling Design Experiments Conclusions Understanding Multipath Key observations Sender Multipaths contain both static component and dynamic com- LoS path ponent Reflected by wall d,(0) Each path has different phase Phases determine the ampli- Reflected by body tude of the combined signal Wall Receiver 日，+司1三13非三分Q0 5/24
Motivation Modeling Design Experiments Conclusions Understanding Multipath Key observations • Multipaths contain both static component and dynamic component • Each path has different phase • Phases determine the amplitude of the combined signal Sender Wall Receiver Reflected by body Reflected by wall LoS path dk (0) dk (0) 5/24
Motivation Modeling Design Experiments:Conclusions Understanding Multipath 00 Sender Q LoS path Dynamic Q Static Component Reflected by component wall d(oj Reflected by Combined body Wall Receiver 口，01三13卡至QC 6/24
Motivation Modeling Design Experiments Conclusions Understanding Multipath Sender Wall Receiver Reflected by body Reflected by wall LoS path dk (0) dk (0) I Q Combined Static component Dynamic Component 6/24
Motivation Modeling Design Experiments:Conclusions Understanding Multipath Sender Q Dynamic Component d(t) LoS path Static 】 component Reflected by wall Combined Reflected by body Wall Receiver 日，+司1三13卡三分Q0 6/24
Motivation Modeling Design Experiments Conclusions Understanding Multipath Sender Receiver dk (t) Wall Reflected by body Reflected by wall LoS path LoS path I Q Combined Static component Dynamic Component 6/24
Motivation Modeling Design Experiments. Conclusions Understanding Multipath Sender Q+ Combined Dynamic Component d.) LoS path Static Reflected by component wall Reflected by body Wall Receiver 日，+司1三13卡三分Q0 6/24
Motivation Modeling Design Experiments Conclusions Understanding Multipath Sender Receiver dk (t) Wall Reflected by body Reflected by wall LoS path I Q Combined Static component Dynamic Component 6/24