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Our worldviewDemand for better wireless communications Better is faster, but also want consistency With low loss/latency for real-time applications Denser mix of devices and rich applications Increased usage in many spaces Co-channel interference is the limiting factor Unmanaged wireless environments Diverse set of devices compete in available bands No party coordinates overall system Want to improve the system, not individual links Significant inefficiencies in 802.11 network*^,N V2-*^,N V2 -^^%Spectrum scheduling via carrier sensej Carrier sense (CSMA/CA) used to serialize in-range transmissions Widely used foundation of wireless LANskkda$But CSMA/CA has known inefficiencies Too aggressive in some cases (hidden terminals increase loss) and too conservative in others (exposed terminals lower throughput) fbThe costs of CSMA/CAd Tweaks mostly trade hidden and exposed terminal cases Today, operate to minimize hidden terminals eehc Towards living with interference Want to increase concurrent transmissions (to boost performance) but mitigate cases with harmful collisions (to reduce loss). How?Z\B2. Conventional SINR Decoding with two transmissions ( + ) C gDecoding successful (green region) if signal is stronger than combined power of interference and noise: h V[Conventional SINR Decoding  `Decoding unsuccessful (white) if signal is weaker than combined power of interference and noise: a []*Successive Interference Cancellation (SIC)qDecode signal with sufficient SINR as before, then model and cancel it, and decode remaining signal. Repeat. $rmzjPotential benefits of SICSIC can successfully decode multiple packets (versus zero or one) during collisions. This has several effects: Reduces loss Improves fairness and predictability Increases overall throughput at the cost of peak individual rate <ovovle3. SIC PrototypezAdapts SIC for bursty, chaotic networks such as 802.11 No synchronization, weak knowledge of channel state, multiple receivers Implemented on USRP platform Zigbee-like PHY coding, similar to low-rate 802.11 Both conventional and SIC detector for comparison USRP-related limitations No carrier sense; simulate based on measured behavior No ACKs due to long rx/tx turnaround time 7He`7He`P og Experimental setup & methodology ! *Pairs of nodes send packets with fixed rate and power Workload is set to two-packet collisions at random offsets Consider only  feasible links with >75% delivery Log waveforms and run through SIC and conventional receivers Use measurements to extrapolate CSMA performance6   vhCMeasured delivery under interference (two senders and one receiver) Higher SINR sender received reliably because SIC includes resynchronization; otherwise half the time by conventional detector h Lower SINR sender recovered by SIC most of the time; nearly always lost by conventional detectorbixi(Extrapolated Network behavior with CSMA p Conventional receiver sees many worse links and few better links with more spatial reuse (CS threshold).jq g SIC receiver sees many better links and few worse links with more spatial reuse (CS threshold).ah|k Conclusions NSuccessive Interference Cancellation (SIC) can improve the use of spectrum by simplifying the wireless LAN scheduling problem Adds robustness to mask the ill-effects of CSMA/CA Early stage, simple experiments on software-defined radio platforms show this benefit. 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Spectrum scheduling via carrier sense%But CSMA/CA has known inefficienciesThe costs of CSMA/CA!Towards living with interferenceC2. Conventional SINR Decoding with two transmissions ( + )Conventional SINR Decoding+Successive Interference Cancellation (SIC)Potential benefits of SIC3. 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Spectrum scheduling via carrier sensej Carrier sense (CSMA/CA) used to serialize in-range transmissions Widely used foundation of wireless LANskkda$But CSMA/CA has known inefficiencies Too aggressive in some cases (hidden terminals increase loss) and too conservative in others (exposed terminals lower throughput) fbThe costs of CSMA/CAd Tweaks mostly trade hidden and exposed terminal cases Today, operate to minimize hidden terminals eehc Towards living with interference Want to increase concurrent transmissions (to boost performance) but mitigate cases with harmful collisions (to reduce loss). Z\B2. Conventional SINR Decoding with two transmissions ( + ) C gDecoding successful (green region) if signal is stronger than combined power of interference and noise: h V[Conventional SINR Decoding  `Decoding unsuccessful (white) if signal is weaker than combined power of interference and noise: a []*Successive Interference Cancellation (SIC)qDecode signal with sufficient SINR as before, then model and cancel it, and decode remaining signal. Repeat. $rmzjPotential benefits of SICSIC can successfully decode multiple packets (versus zero or one) during collisions. This has several effects: Reduces loss Improves fairness and predictability Increases overall throughput at the cost of peak individual rate <ovovle3. SIC PrototypezAdapts SIC for bursty, chaotic networks such as 802.11 No synchronization, weak knowledge of channel state, multiple receivers Implemented on USRP platform Zigbee-like PHY coding, similar to low-rate 802.11 Both conventional and SIC detector for comparison USRP-related limitations No carrier sense; simulate based on measured behavior No ACKs due to long rx/tx turnaround time 7He`7He`P og Experimental setup & methodology ! *Pairs of nodes send packets with fixed rate and power Workload is set to two-packet collisions at random offsets Consider only  feasible links with >75% delivery Log waveforms and run through SIC and conventional receivers Use measurements to extrapolate CSMA performance6   vhCMeasured delivery under interference (two senders and one receiver) Higher SINR sender received reliably because SIC includes resynchronization; otherwise half the time by conventional detector i Lower SINR sender recovered by SIC most of the time; nearly always lost by conventional detectorbjxi(Extrapolated Network behavior with CSMA p Conventional receiver sees many worse links and few better links with more spatial reuse (CS threshold).jq g SIC receiver sees many better links and few worse links with more spatial reuse (CS threshold).ah|k Conclusions MSuccessive Interference Cancellation (SIC) can improve the use of spectrum by simplifying the wireless LAN scheduling problem Improves performance, adds robustness to CSMA/CA Early stage, simple experiments on software-defined radio platforms show this benefit. 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Spectrum scheduling via carrier sensej Carrier sense (CSMA/CA) used to serialize in-range transmissions Widely used foundation of wireless LANskkda$But CSMA/CA has known inefficiencies Too aggressive in some cases (hidden terminals increase loss) and too conservative in others (exposed terminals lower throughput) fbThe costs of CSMA/CAd Tweaks mostly trade hidden and exposed terminal cases Today, operate to minimize hidden terminals eehc Towards living with interference Want to increase concurrent transmissions (to boost performance) but mitigate cases with harmful collisions (to reduce loss). Z\B2. Conventional SINR Decoding with two transmissions ( + ) C gDecoding successful (green region) if signal is stronger than combined power of interference and noise: h V[Conventional SINR Decoding  `Decoding unsuccessful (white) if signal is weaker than combined power of interference and noise: a []*Successive Interference Cancellation (SIC)qDecode signal with sufficient SINR as before, then model and cancel it, and decode remaining signal. Repeat. $rmzjPotential benefits of SICSIC can successfully decode multiple packets (versus zero or one) during collisions. This has several effects: Reduces loss Improves fairness and predictability Increases overall throughput at the cost of peak individual rate <ovovle3. SIC PrototypezAdapts SIC for bursty, chaotic networks such as 802.11 No synchronization, weak knowledge of channel state, multiple receivers Implemented on USRP platform Zigbee-like PHY coding, similar to low-rate 802.11 Both conventional and SIC detector for comparison USRP-related limitations No carrier sense; simulate based on measured behavior No ACKs due to long rx/tx turnaround time 7He`7He`P og Experimental setup & methodology ! *Pairs of nodes send packets with fixed rate and power Workload is set to two-packet collisions at random offsets Consider only  feasible links with >75% delivery Log waveforms and run through SIC and conventional receivers Use measurements to extrapolate CSMA performance6   vhCMeasured delivery under interference (two senders and one receiver) Higher SINR sender received reliably because SIC includes resynchronization; otherwise half the time by conventional detector i Lower SINR sender recovered by SIC most of the time; nearly always lost by conventional detectorbjxi>Extrapolated network behavior with CSMA (two competing links) q Conventional receiver sees many worse links and few better links with more spatial reuse (CS threshold).jr h SIC receiver sees many better links and few worse links with more spatial reuse (CS threshold).ai|k Conclusions MSuccessive Interference Cancellation (SIC) can improve the use of spectrum by simplifying the wireless LAN scheduling problem Improves performance, adds robustness to CSMA/CA Early stage, simple experiments on software-defined radio platforms show this benefit. 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Spectrum scheduling via carrier sensej Carrier sense (CSMA/CA) used to serialize in-range transmissions Widely used foundation of wireless LANskkda$But CSMA/CA has known inefficiencies Too aggressive in some cases (hidden terminals increase loss) and too conservative in others (exposed terminals lower throughput) fbThe costs of CSMA/CAd Tweaks mostly trade hidden and exposed terminal cases Today, operate to minimize hidden terminals eehc Towards living with interference Want to increase concurrent transmissions (to boost performance) but mitigate cases with harmful collisions (to reduce loss). Z\B2. Conventional SINR Decoding with two transmissions ( + ) C gDecoding successful (green region) if signal is stronger than combined power of interference and noise: h V[Conventional SINR Decoding  `Decoding unsuccessful (white) if signal is weaker than combined power of interference and noise: a []*Successive Interference Cancellation (SIC)qDecode signal with sufficient SINR as before, then model and cancel it, and decode remaining signal. Repeat. $rmzjPotential benefits of SICSIC can successfully decode multiple packets (versus zero or one) during collisions. This has several effects: Reduces loss Improves fairness and predictability Increases overall throughput at the cost of peak individual rate <ovovle3. SIC PrototypezAdapts SIC for bursty, chaotic networks such as 802.11 No synchronization, weak knowledge of channel state, multiple receivers Implemented on USRP platform Zigbee-like PHY coding, similar to low-rate 802.11 Both conventional and SIC detector for comparison USRP-related limitations No carrier sense; simulate based on measured behavior No ACKs due to long rx/tx turnaround time 7He`7He`P og Experimental setup & methodology ! *Pairs of nodes send packets with fixed rate and power Workload is set to two-packet collisions at random offsets Consider only  feasible links with >75% delivery Log waveforms and run through SIC and conventional receivers Use measurements to extrapolate CSMA performance6   vhCMeasured delivery under interference (two senders and one receiver) Higher SINR sender received reliably because SIC includes resynchronization; otherwise half the time by conventional detector i Lower SINR sender recovered by SIC most of the time; nearly always lost by conventional detectorbjxi>Extrapolated network behavior with CSMA (two competing links) q Conventional receiver sees many worse links and few better links with more spatial reuse (CS threshold).jr h SIC receiver sees many better links and few worse links with more spatial reuse (CS threshold).ai|k Conclusions MSuccessive Interference Cancellation (SIC) can improve the use of spectrum by simplifying the wireless LAN scheduling problem Improves performance, adds robustness to CSMA/CA Early stage, simple experiments on software-defined radio platforms show this benefit. Assessing feasibility of extending into 802.11n NICs Thank you!`~3X9 ~3X9 9/QY \!]"a#e&g'i(p*r,w-y.{/}0PrS}}