The Experts below are selected from a list of 1590 Experts worldwide ranked by ideXlab platform
Peter R. Kinget - One of the best experts on this subject based on the ideXlab platform.
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Clockless, Continuous-Time Analog Correlator Using Time-EnCoded Signal Processing Demonstrating Asynchronous CDMA for Wake-Up Receivers
IEEE Journal of Solid-State Circuits, 1Co-Authors: Vivek Mangal, Peter R. KingetAbstract:A clockless, continuous-time (CT) analog correlator circuit realization is presented based on time-enCoded analog signal processing. Voltage-controlled oscillators (VCOs) transform the analog voltage signals into time-enCoded analog signals and, in the process, perform signal integration; CT, digital-style delay cells combined with phase-frequency detectors followed by capacitive summers implement a CT matched filter. The correlator prototype designed in 65-nm CMOS-LP technology consumes 37 nW from 0.54 V and is used in the baseband of a wake-up receiver to despread asynchronous Code-division multiple access (CDMA) Codes and demonstrate Code-domain filtering for an 11-bit Barker Code. The wake-up receiver's sensitivity is enhanced by 2 dB to -80.9 dBm for a missed detection ratio of 10⁻³, and its selectivity is improved by 5 dB, thanks to the use of the correlator. Simultaneous wake-up using CDMA is demonstrated with selective responses of the receiver to different desired Codes in the presence of an undesired Code.
Christian Hoene - One of the best experts on this subject based on the ideXlab platform.
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Precise time of flight measurements in IEEE 802.11 networks by cross-correlating the sampled signal with a continuous Barker Code
2010 IEEE 7th International Conference on Mobile Adhoc and Sensor Systems MASS 2010, 2010Co-Authors: Stefan König, Mark Schmidt, Christian HoeneAbstract:Wireless LAN devices can be used for two-way time of arrival (TOA) measurements even with off-the-shelf hardware that has only a measurement resolution of 1 μs. However, to get a good locating and tracking performance the send and arrival times as well as the durations of IEEE 802.11 MAC packets must be measured precisely. In this paper, we calculate a cross-correlation between the received and sampled signal and a time continuous Barker Code sequence to determine the TOA. Our adaptive sampling offset algorithm helps to efficiently obtain a subsample resolution. We implemented our algorithm and an IEEE 802.11 receiver as a Software-Defined-Radio (SDR) program. In our experiments, the algorithm needs fewer observations in comparison to previously published approaches that measure the time of flight between two WLAN devices.
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MASS - Precise time of flight measurements in IEEE 802.11 networks by cross-correlating the sampled signal with a continuous Barker Code
The 7th IEEE International Conference on Mobile Ad-hoc and Sensor Systems (IEEE MASS 2010), 2010Co-Authors: Stefan König, Mark Schmidt, Christian HoeneAbstract:Wireless LAN devices can be used for two-way time of arrival (TOA) measurements even with off-the-shelf hardware that has only a measurement resolution of 1 µs. However, to get a good locating and tracking performance the send and arrival times as well as the durations of IEEE 802.11 MAC packets must be measured precisely. In this paper, we calculate a cross-correlation between the received and sampled signal and a time continuous Barker Code sequence to determine the TOA. Our adaptive sampling offset algorithm helps to efficiently obtain a subsample resolution. We implemented our algorithm and an IEEE 802.11 receiver as a Software-Defined-Radio (SDR) program. In our experiments, the algorithm needs fewer observations in comparison to previously published approaches that measure the time of flight between two WLAN devices.
Vivek Mangal - One of the best experts on this subject based on the ideXlab platform.
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Clockless, Continuous-Time Analog Correlator Using Time-EnCoded Signal Processing Demonstrating Asynchronous CDMA for Wake-Up Receivers
IEEE Journal of Solid-State Circuits, 1Co-Authors: Vivek Mangal, Peter R. KingetAbstract:A clockless, continuous-time (CT) analog correlator circuit realization is presented based on time-enCoded analog signal processing. Voltage-controlled oscillators (VCOs) transform the analog voltage signals into time-enCoded analog signals and, in the process, perform signal integration; CT, digital-style delay cells combined with phase-frequency detectors followed by capacitive summers implement a CT matched filter. The correlator prototype designed in 65-nm CMOS-LP technology consumes 37 nW from 0.54 V and is used in the baseband of a wake-up receiver to despread asynchronous Code-division multiple access (CDMA) Codes and demonstrate Code-domain filtering for an 11-bit Barker Code. The wake-up receiver's sensitivity is enhanced by 2 dB to -80.9 dBm for a missed detection ratio of 10⁻³, and its selectivity is improved by 5 dB, thanks to the use of the correlator. Simultaneous wake-up using CDMA is demonstrated with selective responses of the receiver to different desired Codes in the presence of an undesired Code.
Stefan König - One of the best experts on this subject based on the ideXlab platform.
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Precise time of flight measurements in IEEE 802.11 networks by cross-correlating the sampled signal with a continuous Barker Code
2010 IEEE 7th International Conference on Mobile Adhoc and Sensor Systems MASS 2010, 2010Co-Authors: Stefan König, Mark Schmidt, Christian HoeneAbstract:Wireless LAN devices can be used for two-way time of arrival (TOA) measurements even with off-the-shelf hardware that has only a measurement resolution of 1 μs. However, to get a good locating and tracking performance the send and arrival times as well as the durations of IEEE 802.11 MAC packets must be measured precisely. In this paper, we calculate a cross-correlation between the received and sampled signal and a time continuous Barker Code sequence to determine the TOA. Our adaptive sampling offset algorithm helps to efficiently obtain a subsample resolution. We implemented our algorithm and an IEEE 802.11 receiver as a Software-Defined-Radio (SDR) program. In our experiments, the algorithm needs fewer observations in comparison to previously published approaches that measure the time of flight between two WLAN devices.
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MASS - Precise time of flight measurements in IEEE 802.11 networks by cross-correlating the sampled signal with a continuous Barker Code
The 7th IEEE International Conference on Mobile Ad-hoc and Sensor Systems (IEEE MASS 2010), 2010Co-Authors: Stefan König, Mark Schmidt, Christian HoeneAbstract:Wireless LAN devices can be used for two-way time of arrival (TOA) measurements even with off-the-shelf hardware that has only a measurement resolution of 1 µs. However, to get a good locating and tracking performance the send and arrival times as well as the durations of IEEE 802.11 MAC packets must be measured precisely. In this paper, we calculate a cross-correlation between the received and sampled signal and a time continuous Barker Code sequence to determine the TOA. Our adaptive sampling offset algorithm helps to efficiently obtain a subsample resolution. We implemented our algorithm and an IEEE 802.11 receiver as a Software-Defined-Radio (SDR) program. In our experiments, the algorithm needs fewer observations in comparison to previously published approaches that measure the time of flight between two WLAN devices.
Zhao Xiao-qun - One of the best experts on this subject based on the ideXlab platform.
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A Conclusion on Bi-weighted Barker Codes and Tri-weighted Barker Codes
Journal of Hebei University of Technology, 2000Co-Authors: Zhao Xiao-qunAbstract:This paper proved of that bi-weighted Barker Code and tri-weighted Barker Code is equivalence on meaning of a mapping correlation. A new aperiodic correlation functions of tri-mapping is gave and a new triweighted Barker Code is defined. The cost of the tri-weighted Barker Code in applying is increasing complexity in calculating correlation function, but the property of the sequences is advanced.