Passive DSSS: Empowering the Downlink Communication for Backscatter Systems
Talkat 19th USENIX Symposium on Networked Systems Design and Implementation (NSDI '22) · 2022-04-04..04-06·
summary
Proposes shifting DSSS spreading-code generation and synchronization to the gateway and sending a baseband channel plus a synchronized spreading-code channel so energy‑constrained backscatter tags demodulate with only an envelope detector and an 1-bit ADC plus simple XOR/analog correlation circuitry. Implements on USRP gateway and a passive prototype, uses analog correlation to cancel uncorrelated channel interference, and reports a downlink SINR boost of about 16.5 dB, roughly threefold effective range increase (measured up to ~52 m).
AI-written summary · about
chapters (13)
- 0:00Intro
- 1:06Downlink and Uplink are highly asymmetric
- 4:05We propose Passive DSSS (Direct-Sequence Spread Spectrum)
- 4:46Key challenge to achieve DSSS on the downlink
- 6:20Basic idea of Passive DSSS
- 7:04cannot demodulate existing DSSS signals
- 8:03how to suppress interference from both channels
- 9:13correlation calculation requires signal processing
- 10:01Passive DSSS receiver design
- 10:51Experimental setup
- 11:19Evaluation - Performance and baseline
- 13:26Evaluation - Interference Resistance
- 14:14Evaluation Downlink Range
related talks
18mSpectrumize: Spectrum-efficient Satellite Networks for the Internet of Things
15mDecoding RSSI Compression in RFID: Dynamic RCS Modeling and Tag-Intrinsic Power Metrics..
17mmmComb: High-speed mmWave Commodity WiFi Backscatter
26mHELP: Helper-Enabled In-Band Device Pairing…
20mSozu: Self-Powered Radio Tags for Building-Scale Activity Sensing
13mSlimWiFi: Ultra-Low-Power IoT Radio Architecture Enabled by Asymmetric Communication
22mSplash: Fast Data Dissemination with Constructive Interference in Wireless Sensor
31mTSCH@Zephyr: IEEE 802.15.4 SubG IIoT in the Making