Proceedings ArticleDOI
E-MiLi: energy-minimizing idle listening in wireless networks
Xinyu Zhang,Kang G. Shin +1 more
- pp 205-216
TLDR
E-MiLi employs an opportunistic downclocking mechanism to optimize the efficiency of switching clock rate, based on a simple interface to existing MAC-layer scheduling protocols, and can detect packets with close to 100 percent accuracy on the USRP software radio platform.Abstract:
WiFi interface is known to be a primary energy consumer in mobile devices, and idle listening (IL) is the dominant source of energy consumption in WiFi. Most existing protocols, such as the 802.11 power-saving mode (PSM), attempt to reduce the time spent in IL by sleep scheduling. However, through an extensive analysis of real-world traffic, we found more than 60% of energy is consumed in IL, even with PSM enabled. To remedy this problem, we propose E-MiLi (Energy-Minimizing idle Listening) that reduces the power consumption in IL, given that the time spent in IL has already been optimized by sleep scheduling. Observing that radio power consumption decreases proportionally to its clock-rate, E-MiLi adaptively downclocks the radio during IL, and reverts to full clock-rate when an incoming packet is detected or a packet has to be transmitted. E-MiLi incorporates sampling rate invariant detection, ensuring accurate packet detection and address filtering even when the receiver's sampling clock-rate is much lower than the signal bandwidth. Further, it employs an opportunistic downclocking mechanism to optimize the efficiency of switching clock-rate, based on a simple interface to existing MAC-layer scheduling protocols. We have implemented E-MiLi on the USRP software radio platform. Our experimental evaluation shows that E-MiLi can detect packets with close to 100% accuracy even with downclocking by a factor of 16. When integrated with 802.11, E-MiLi can reduce energy consumption by around 44% for 92% of users in real-world wireless networks.read more
Citations
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Proceedings ArticleDOI
PLoRa: a passive long-range data network from ambient LoRa transmissions
Yao Peng,Longfei Shangguan,Yue Hu,Qian Yujie,Lin Xianshang,Xiaojiang Chen,Dingyi Fang,Kyle Jamieson +7 more
TL;DR: PLoRa takes ambient LoRa transmissions as the excitation signals, conveys data by modulating an excitation signal into a new standard LoRa "chirp" signal, and shifts this new signal to a different LoRa channel to be received at a gateway faraway.
Proceedings ArticleDOI
Gap Sense: Lightweight coordination of heterogeneous wireless devices
Xinyu Zhang,Kang G. Shin +1 more
TL;DR: Gap Sense (GSense) is introduced, a novel mechanism that can coordinate heterogeneous devices without modifying their PHYlayer modulation schemes or spectrum widths and is shown to deliver coordination information with close to 100% accuracy within practical SNR regions.
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Come and Be Served: Parallel Decoding for COTS RFID Tags
Jiajue Ou,Mo Li,Yuanqing Zheng +2 more
TL;DR: The experimental study gives encouraging results that BiGroup greatly improves RFID communication efficiency, i.e., 11× performance improvement compared to the alternative decoding scheme for COTS tags and 6× gain in time efficiency when applied to EPC C1G2 tag identification.
Proceedings ArticleDOI
Acoustic Eavesdropping through Wireless Vibrometry
TL;DR: A new acoustic eavesdropping attack that can subvert such protectors using radio devices by inspecting the subtle disturbance it causes to the radio signals generated by an adversary or by its co-located WiFi transmitter is explored.
Journal ArticleDOI
A Survey on High Efficiency Wireless Local Area Networks: Next Generation WiFi
Hassan Aboubakr Omar,Khadige Abboud,Nan Cheng,Kamal Rahimi Malekshan,Amila Tharaperiya Gamage,Weihua Zhuang +5 more
TL;DR: This paper presents potential techniques that can be applied for HEWs, in order to achieve the required performance in dense HEW deployment scenarios, as expected in the near future.
References
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