Full Duplex Wireless - Stanford University

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Chuck Thacker InterviewCommunications of the ACM, July 20102
“It is generally not possible for radios to receiveand transmit on the same frequency band becauseof the interference that results. Thus, bidirectionalsystems must separate the uplink and downlinkchannels into orthogonal signaling dimensions,typically using time or frequency dimensions.”- Andrea Goldsmith, “<strong>Wireless</strong> Communications,” Cambridge Press, 2005.3
Page 1: Full Duplex WirelessPhilip LevisSta
Page 5 and 6: Why Half Duplex?TX RX TX RX• Self
Page 7 and 8: Existing Techniques• Digital canc
Page 9 and 10: First Design: Antenna CancellationT
Page 11 and 12: Three techniques give ~70dB cancell
Page 13 and 14: Bringing It TogetherAntennaCancella
Page 15 and 16: Bringing It TogetherAntennaCancella
Page 17 and 18: Antenna Cancellation: PerformanceTX
Page 19 and 20: Antenna Cancellation: PerformanceTX
Page 21 and 22: Sensitivity of Antenna Cancellation
Page 23 and 24: Sensitivity of Antenna Cancellation
Page 25 and 26: Bandwidth ConstraintA λ/2 offset i
Page 27 and 28: Bandwidth ConstraintA λ/2 offset i
Page 29 and 30: Bandwidth Constraint300 MHz2.4 GHz5
Page 31 and 32: Half-Duplex :- Nodes interleave tra
Page 33 and 34: ThroughputHalf-Duplex Full-Duplex I
Page 35 and 36: Why Half Duplex?TX RX TX RX• Self
Page 37 and 38: Cancellation using Phase OffsetSelf
Page 39 and 40: Cancellation using Signal Inversion
Page 41 and 42: TimeSecond Design: Balanced to Unba
Page 43 and 44: 1. Invert the SignalaTR+T -TR+aT2TT
Page 45 and 46: 3. Match SignalsaTR2T+Tbalun-Tatten
Page 47 and 48: TimeSignal Inversion Cancellation:
Page 49 and 50: TimeHigher isbetterLower isbetter~5
Page 51 and 52: Adaptive RF CancellationTXRXBalunRF
Page 53 and 54:
Adaptive RF CancellationTXRXRF Refe
Page 55:
Objective: Minimize received powerC
Page 58 and 59:
Bringing It All TogetherTXRXRF Refe
Page 60 and 61:
Performance• WiFi full-duplex: wi
Page 62 and 63:
Implementation• WARPv2 boards wit
Page 64 and 65:
Mitigating Hidden TerminalsCurrent
Page 66 and 67:
Network Congestion and WLAN Fairnes
Page 68 and 69:
Network Congestion and WLAN Fairnes
Page 70 and 71:
Tomorrow: Full DuplexBTFM/XMWLANWid
Page 72 and 73:
Full-duplex NetworkingAccess Point
Page 74 and 75:
Full-duplex NetworkingAccess Point
Page 76 and 77:
Possible Dealbreakers
Page 78 and 79:
Frequency SelectivityLower isbetter
Page 80 and 81:
Greatest Potential?• Where capaci
Page 83 and 84:
Backup83
Page 85:
y axis (meters)What about attenuati
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Full Duplex Wireless - Stanford University

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