1. Daniel de Godoy Peixoto
CPS SEMINAR: Non-invasive Respiration Rate Monitoring Using a Single COTS TX-RX Pair
Daniel de Godoy Peixoto
1 | CPS SEMINAR: Non-invasive Respiration Rate Monitoring Using a Single COTS TX-RX Pair

2. ABSTRACT: Main System’s Objective & Structural Overview
SYSTEM GOAL
Respiratory Rate Monitor
SYSTEM HIGHLIGHTS
Comfortable
– Non-Contact
Accessible – Low Cost
APPROACH
1 - Single Sensor Pair
RF RSS – Received
Signal Strength
2 - Commercial off-the-shelf (COTS) transmitter-receiver
TECHNICAL NOVELTY
Accuracy enhancement
RESULTS
Comparable performance of high-end devices
2 | CPS SEMINAR: Non-invasive Respiration Rate Monitoring Using a Single COTS TX-RX Pair

3. SYSTEM APPROACH REASONING SYSTEM APPROACH CHALLENGES
INTRODUCTION: Reasoning & Challenges & Contributions
SYSTEM APPROACH REASONING
SYSTEM APPROACH CHALLENGES
Respiratory Rate Monitor
1 – Breathing cause very small changes in the RSS
(in other words, low SNR)
2 – User (patient) movement may interfere with the measurements
Physically Contacting
Sensors
Non-Contact
(RSS)
WORK CONTRIBUTION
1 – Increase SNR: oversampling, filtering, low-jitter periodic communication, directional antennas
2 – HMM to identify motion interference
3 – Decimation: Allow embedded implementation
4 – Empirical demonstration with IEEE
AKA  ZigBee,[2] ISA100.11a,[3] WirelessHART
Multiple
Transceivers
Single
RX-TX Pair
3 | CPS SEMINAR: Non-invasive Respiration Rate Monitoring Using a Single COTS TX-RX Pair

4. BREAKPOINT1: 2.46GHz works, but 2.415 doesn’t, why?
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5. METHODOLOGY: SYSTEM
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6. METHODOLOGY: SYSTEM Quantization Noise Dominated
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7. METHODOLOGY: SYSTEM
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8. METHODOLOGY: SYSTEM
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9. METHODOLOGY: Motion Interference Detection (Principle)TX RX ~
9 | CPS SEMINAR: Non-invasive Respiration Rate Monitoring Using a Single COTS TX-RX Pair

10. When in S2 the breathing estimation is disable
METHODOLOGY: Motion Interference Detection (HMM) S1 S2
S1 => No motion interference
S2 => Motion interference
When in S2 the breathing estimation is disable
10 | CPS SEMINAR: Non-invasive Respiration Rate Monitoring Using a Single COTS TX-RX Pair

11. METHODOLOGY: SYSTEM (cont)
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12. METHODOLOGY: Breathing EstimationTX RX
(1)
(4)
(2)
(3)
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13. EXPERIMENTS: Setup Queen size bed Reference High Res. ADC
Directional antennas
Texas Instruments CC2431
IEEE
2.4GHz ISM band
Sequential 16 channel sweeping
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14. EXPERIMENTS: RSS vs Breathing
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15. EXPERIMENTS: ACCURACY
CLOSE TO REFERENCE
(x) precise
( ) scattered
15 | CPS SEMINAR: Non-invasive Respiration Rate Monitoring Using a Single COTS TX-RX Pair

16. EXPERIMENTS: Motion Interference Detection
Rolling in the bed
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17. EXPERIMENTS: Motion Interference Detection
Human-induced
error
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18. EXPERIMENTS: Parametric Variation
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19. PROPOSED DISCUSSION: CONS
Writing stile: 13 sentences started with “However,…”
How many people were used to test the setup? What are their differences?
The HMM algorithm was not super clear (TO ME).
PROS
Highly applicable: hospitals, Nursing homes
Easily replicable (people can really benefit from this work)
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