1. Communication between Wireless Sensor Devices and GNU Radio
Gaurav Konchady
Sriram Sanka

2. Gaurav Konchady and Sriram Sanka
Outline
Wireless Sensor Networks
Motes
GNU Radio as Base-station
CC1000 RF Transceiver
IEEE Standard
Block Diagram
Results
April 1, 2017
Gaurav Konchady and Sriram Sanka

3. Wireless Sensor Networks
Network of Spatially distributed sensor devices
Two tiered architecture
Sensor and Base-station nodes
April 1, 2017
Gaurav Konchady and Sriram Sanka

4. Gaurav Konchady and Sriram Sanka
Types of Motes
TelosB, MICA2 and MICAz to be used in project
Motes programmed in TinyOS software platform
Other OSs include SOS, Contiki, Mantis, etc.
April 1, 2017
Gaurav Konchady and Sriram Sanka

5. GNU Radio as Base-station
Interoperability with heterogeneous motes
Wideband nature of USRP enables multichannel communication
Flexibility in selection of modulation scheme
April 1, 2017
Gaurav Konchady and Sriram Sanka

6. Gaurav Konchady and Sriram Sanka
CC1000 RF Transceiver
Frequency range: 300 – 1000 MHz
FSK modulation with 76.8 kBaud max
Manchester encoding
Integrated bit-synchronizer
April 1, 2017
Gaurav Konchady and Sriram Sanka

7. Gaurav Konchady and Sriram Sanka
TinyOS CC1000 Frame Format
TinyOS and SOS CC1000 frame formats have different fields
Requires changes in CC1000 modulator and demodulator blocks in GNU Radio
April 1, 2017
Gaurav Konchady and Sriram Sanka

8. Gaurav Konchady and Sriram Sanka
IEEE Standard
MAC and Physical layer protocol for short-distance, low-power, low-data-rate wireless communication
128 byte maximum MAC frame size
2400 MHz to MHz frequency range
DSSS employing O-QPSK modulation
April 1, 2017
Gaurav Konchady and Sriram Sanka

9. Gaurav Konchady and Sriram Sanka
TinyOS T-frame
T-frame differs from the original IEEE frame format
Requires modifications to modulator and demodulator blocks in GNU Radio
April 1, 2017
Gaurav Konchady and Sriram Sanka

10. Gaurav Konchady and Sriram Sanka
Project Setup
MICA2 mote sends data to USRP (FLEX400)
USRP extracts payload from CC1000 frame
Payload inserted in an T-frame
T-frame transmitted by USRP (RFX2400)
Packets received by TelosB mote
April 1, 2017
Gaurav Konchady and Sriram Sanka

11. Gaurav Konchady and Sriram Sanka
Block Diagram
FLEX400
CC1000 Demodulator
Modulator
Packet Queue
Python Callback
Python send_pkt()
RFX2400
USRP
April 1, 2017
Gaurav Konchady and Sriram Sanka

12. Gaurav Konchady and Sriram Sanka
Goals Accomplished
Detecting frame on USRP using RFX2400 daughterboard
MICA2 to USRP communication
TelosB to USRP communication
MICA2 to TelosB communication via USRP
Future work
TelosB to MICA2 communication via USRP
April 1, 2017
Gaurav Konchady and Sriram Sanka

13. Gaurav Konchady and Sriram Sanka
Results
MICA2 output
USRP output
TelosB base-station output
April 1, 2017
Gaurav Konchady and Sriram Sanka

14. Gaurav Konchady and Sriram Sanka
References
IEEE standard,
Thomas Schmid, GNU Radio En-and Decoding,
TEP 125 – TinyOS Frames,
CC1000 datasheet,
April 1, 2017
Gaurav Konchady and Sriram Sanka

15. Gaurav Konchady and Sriram Sanka
Thank you
Questions?
April 1, 2017
Gaurav Konchady and Sriram Sanka