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Developing a SDR Testbed

Developing a SDR Testbed. Alex Dolan Mohammad Khan Ahmet Unsal Project Advisor Dr. Aditya Ramamoorthy. Presentation Overview. Background Information Project Overview System Design Progress and Plan. Background Information. Software Defined Radio USRP-2 DaughterBoard.

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Developing a SDR Testbed

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  1. Developing a SDR Testbed Alex Dolan Mohammad Khan Ahmet Unsal Project Advisor Dr. Aditya Ramamoorthy

  2. Presentation Overview • Background Information • Project Overview • System Design • Progress and Plan

  3. Background Information • Software Defined Radio • USRP-2 • DaughterBoard

  4. Project Overview Project Goal • Develop a Software Defined Radio network testbed, using MATLAB Simulink and USRP-2 • Evaluate MATLAB Simulink’s Versatility as a SDR platform

  5. Requirements • Implement a SDR Testbed • Use of Universal Software Radio Peripheral-2 (USRP-2) • Use of MATLAB Simulink • Implement digital modulation schemes like FSK, BPSK, DBPSK, QAM • Implement simplified 802.11 MAC

  6. Constraints • USRP-2 • Number of nodes • Frequency Range • Bandwidth • Transmission Power •  Processing • CPU Cycles • Time

  7. Assumptions • Tested under reasonable conditions • Normal level of noise • Controlled transmission range

  8. Resources •  2 USRP-2s • Sample rate of 100 MHz •  2 Dell Optiplex 980 Computers • Intel Core i7 Processor •  Daughterboards • Various daughterboards for different frequency bands • Able to transmit and receive up to 5 GHz

  9. Design Physical Layer • Design MAC Layer • Testing and Logging Design Process

  10. System Decomposition • Physical layer: • USRP-2 • Simulink – DSP and digital communications • MAC: • Coordinates transmission among nodes. • Testing and Logging: • The tools used to test the system. • Tracks progress and success.

  11. System Block Diagram

  12. Physical Layer • Simulink signal processing • FSK, PSK, QAM modulation/demodulation • Synchronization and packetization • Error control • USRP-2 hardware • Ethernet interface with 100 MSamples/s A/D conversion

  13. Physical Layer (PHY) Block Diagram

  14. MAC Layer • Coordinate channel access between nodes • Simplified 802.11 implementation • Carrier sense multiple access with collision avoidance (CSMA/CA) • Written in C++ or embedded MATLAB.

  15. MAC • Design a MAC that allows simultaneous transmissions when both interfered messages can be decoded • Distributed Algorithm • Similar to 802.11 distributed coordinate function • Use RTS and CTS messages to coordinate interfering transmissions

  16. Testing and Logging • Select logging/testing options  • Logging data to file from individual layers/components  • Scopes/Visualization of data from individual layers/components  • Generation of statistics • Validation

  17. Design Physical Layer in Simulink. • Design each component in Simulink. • Test in controlled MATLAB environment. • Test using USRP-2 and Simulink. • Introduce MAC layer • Move from point to point and introduce more nodes. • Compare results to simulations and expected results. • Observe BER, data rates, etc. Testing Procedure

  18. Schedule

  19. Questions?

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