1. Mayank Jain, Jung Il Choi Tae Min Kim, Dinesh Bharadia, Siddharth Seth, Kannan Srinivasan, Philip Levis, Sachin Katti, Prasn Sinha MobiCom 2011

2. Single channel full-duplex

3. Antenna Cancellation Achieving Single Channel, Full Duplex Wireless Communication [Mobicom’10]

4. Contributions New full-duplex radio design: signal inversion cancellation Wideband, frequency independent One transmit antenna design Real-time full-duplex MAC layer implementation

5. Signal Inversion vs. Phase Offset

6. Phase Offset

7. Signal Inversion

8. Signal Inversion vs. Phase Offset

9. Balun passive cancellation

10. Balun active cancellation

13. Digital cancellation Three novel achievements: - Real-time cancellation implementation that runs in hardware - Cancellation implementation can operate on 10MHz signals - Digital cancellation that operates on OFDM signals Digital cancellation has two components: - Channel Estimation >> least squares algorithm - Applying Digital Cancellation >>

14. Balun + Digital cancellation

15. Implications to Wireless Networks Breaks basic assumption in wireless Can solve some fundamental problems with wireless networks today: - Hidden terminals - Network congestion and WLAN fairness

16. Hidden Terminals

17. Network Congestion and WLAN Fairness

18. Performance Balun Passive/Active Cancellation

19. Performance 1 AP with 4 stations without any hidden terminals

20. Summary Design for real-time full-duplex wireless - Makes full-duplex WiFi possible Made practical using adaptive techniques Rethinking of wireless networks - WiFi: hidden terminals and fairness