mayank jain, jung il choi tae min kim, dinesh bharadia, siddharth seth, kannan srinivasan, philip...
TRANSCRIPT
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Practical, Real-time, Full Duplex Wireless
Mayank Jain, Jung Il ChoiTae Min Kim, Dinesh Bharadia, Sid-
dharth Seth, Kannan Srinivasan, Philip Levis, Sachin Katti, Prasn Sinha
MobiCom 2011
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Single channel full-duplex
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Antenna Cancellation
• Achieving Single Channel, Full Duplex Wireless Communication [Mobicom’10]
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Contributions
• New full-duplex radio design:signal inversion cancellation
• Wideband, frequency independent• One transmit antenna design• Real-time full-duplex MAC layer im-
plementation
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Signal Inversion vs. Phase Offset
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Phase Offset
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Signal Inversion
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Signal Inversion vs. Phase Offset
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Balun passive cancellation
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Balun active cancellation
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Balun active cancellation
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Balun active cancellation
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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 algo-rithm- Applying Digital Cancellation>>
ˆ[ ] [ ] [ ]r n r n i n
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Balun + Digital cancellation
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Implications to Wireless Net-works
• Breaks basic assumption in wireless• Can solve some fundamental prob-
lems with wireless networks today:- Hidden terminals- Network congestion and WLAN fair-ness
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Hidden Terminals
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Network Congestion and WLAN Fair-ness
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Performance
• Balun Passive/Active Cancellation
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Performance
• 1 AP with 4 stations without any hid-den terminals
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Summary
• Design for real-time full-duplex wire-less- Makes full-duplex WiFi possible
• Made practical using adaptive tech-niques
• Rethinking of wireless networks- WiFi: hidden terminals and fairness