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Software-Defined Radio

Software-Defined Radio. Benjamin Brown Kelsey Dutta Clifroy Henry Junior Member: Michael Williams. Overview. Previous Approach Revised Project Definition and Accomplishments GNU and the Hardware FM Transmission 2x2 MIMO Differential Schemes Testing Timeline. Overview.

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Software-Defined Radio

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  1. Software-Defined Radio Benjamin Brown Kelsey Dutta Clifroy Henry Junior Member: Michael Williams

  2. Overview • Previous Approach • Revised Project Definition and Accomplishments • GNU and the Hardware • FM Transmission • 2x2 MIMO • Differential Schemes • Testing • Timeline

  3. Overview • Previous Approach • Revised Project Definition and Accomplishments • GNU and the Hardware • FM Transmission • 2x2 MIMO • Differential Schemes • Testing • Timeline

  4. Previous Approach

  5. Overview • Previous Approach • Revised Project Definition and Accomplishments • GNU and the Hardware • FM Transmission • 2x2 MIMO • Differential Schemes • Testing • Timeline

  6. Revised Project Definition Goals: • Achieve functionality between GNU Radio and hardware • Demonstrate SISO frequency modulation in real-time • Complete a 2x2 transmission • Compare performance of DPSK in SISO and differential Alamouti Coded MIMO real-time wireless channels

  7. Overview • Previous Approach • Revised Project Definition and Accomplishments • GNU and the Hardware • FM Transmission • 2x2 MIMO • Differential Schemes • Testing • Timeline

  8. GNU Radio and Hardware • Hardware optimized for use with USB 3.0 • Original computer only USB 2.0 compatible • Acquired 2 Dell 960 towers and 2 USB 3.0 PCIe cards • Computers loaded with Linux

  9. Overview • Previous Approach • Revised Project Definition and Accomplishments • GNU and the Hardware • FM Transmission • 2x2 MIMO • Differential Schemes • Testing • Timeline

  10. FM Transmission • Production of modulated signal using audio file as baseband signal in GNU Radio • Transmission over-the-air • Reception and demodulation in real-time • Audio played over speakers

  11. FM Transmission

  12. Overview • Previous Approach • Revised Project Definition and Accomplishments • GNU and the Hardware • FM Transmission • 2x2 MIMO • Differential Schemes • Testing • Timeline

  13. 2x2 MIMO Transmission

  14. Overview • Previous Approach • Revised Project Definition and Accomplishments • GNU and the Hardware • FM Transmission • 2x2 MIMO • Differential Schemes • Testing • Timeline

  15. Coherent vs Noncoherent • Coherent communication • Requires estimation of channel • Non-coherent communication • Depends on prior received symbols

  16. Differential Coding • Coherent schemes: each symbol is independent of the one before it • Differential schemes: encode the differences between consecutive message symbols

  17. DBPSK Modulation • Differential Phase Shift Keying • Binary to analog conversion • Information is given by the phase

  18. Coding DBPSK 0 0 0 1 0 1 1 1 0 1

  19. Alamouti Scheme Coherent Scheme: Applying Differential:

  20. Differential Alamouti

  21. Overview • Previous Approach • Revised Project Definition and Accomplishments • GNU and the Hardware • FM Transmission • 2x2 MIMO • Differential Schemes • Testing • Timeline

  22. Testing Scenarios • Must find areas which can test the performance of each algorithm • SISO performs best with line-of-sight and low noise • MIMO’s performance gains are best demonstrated in noisy environments with little or no line-of-sight, such as cities

  23. Overview • Previous Approach • Revised Project Definition and Accomplishments • GNU and the Hardware • FM Transmission • 2x2 MIMO • Differential Schemes • Testing • Timeline

  24. Planning and prototype Modification Final Test Review

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