The Experts below are selected from a list of 9606 Experts worldwide ranked by ideXlab platform

Tadahiro Kuroda - One of the best experts on this subject based on the ideXlab platform.

  • a cmos ultra wideband impulse Radio Transceiver for 1 mb s data communications and spl plusmn 2 5 cm range finding
    IEEE Journal of Solid-state Circuits, 2006
    Co-Authors: T Terada, S Yoshizumi, Muhammad Muqsith, Yukitoshi Sanada, Tadahiro Kuroda
    Abstract:

    A CMOS ultra-wideband impulse Radio (UWB-IR) Transceiver was developed in 0.18-/spl mu/m CMOS technology. It can be used for 1-Mb/s data communications as well as for precise range finding within an error of /spl plusmn/2.5 cm. The power consumptions of the transmitter and receiver for data communication are 0.7 and 4.0 mW, respectively. When an LNA operates intermittently through bias switching, the power consumption of the Transceiver is only 1 mW. The range for data communication is 1 m with BER of 10/sup -3/. For ranging applications, the transmitter can reduce the power to 0.7 /spl mu/W for 1k pulses per second, and the receiver consumes little power. The Transceiver design, all-digital transmitter, and intermittent circuit operation at the receiver reduce the power consumption dramatically, which makes the Transceiver well suited for applications like sensor networks. The electronic field intensity is lower than 35 /spl mu/V/m, and thus the UWB system can be operated even under the current Japan Radio regulations.

  • a cmos ultra wideband impulse Radio Transceiver for 1 mb s data communications and 2 5 cm range finding
    Symposium on VLSI Circuits, 2006
    Co-Authors: T Terada, S Yoshizumi, Muhammad Muqsith, Yukitoshi Sanada, Tadahiro Kuroda
    Abstract:

    A CMOS ultra-wideband impulse Radio (UWB-IR) Transceiver was developed in 0.18-μm CMOS technology. It can be used for 1-Mb/s data communications as well as for precise range finding within an error of +2.5 cm. The power consumptions of the transmitter and receiver for data communication are 0.7 and 4.0 mW, respectively. When an LNA operates intermittently through bias switching, the power consumption of the Transceiver is only 1 mW. The range for data communication is 1 m with BER of 10 -3 . For ranging applications, the transmitter can reduce the power to 0.7 μW for 1k pulses per second, and the receiver consumes little power. The Transceiver design, all-digital transmitter, and intermittent circuit operation at the receiver reduce the power consumption dramatically, which makes the Transceiver well suited for applications like sensor networks. The electronic field intensity is lower than 35 μV/m, and thus the UWB system can be operated even under the current Japan Radio regulations.

Alexander V Rodriguez - One of the best experts on this subject based on the ideXlab platform.

  • a wirelessly powered and controlled device for optical neural control of freely behaving animals
    Journal of Neural Engineering, 2011
    Co-Authors: Christian T Wentz, Jacob G Bernstein, Patrick E Monahan, Alexander Guerra, Alexander V Rodriguez
    Abstract:

    Optogenetics, the ability to use light to activate and silence specific neuron types within neural networks in vivo and in vitro, is revolutionizing neuroscientists' capacity to understand how defined neural circuit elements contribute to normal and pathological brain functions. Typically, awake behaving experiments are conducted by inserting an optical fiber into the brain, tethered to a remote laser, or by utilizing an implanted light-emitting diode (LED), tethered to a remote power source. A fully wireless system would enable chronic or longitudinal experiments where long duration tethering is impractical, and would also support high-throughput experimentation. However, the high power requirements of light sources (LEDs, lasers), especially in the context of the extended illumination periods often desired in experiments, precludes battery-powered approaches from being widely applicable. We have developed a headborne device weighing 2 g capable of wirelessly receiving power using a resonant RF power link and storing the energy in an adaptive supercapacitor circuit, which can algorithmically control one or more headborne LEDs via a microcontroller. The device can deliver approximately 2 W of power to the LEDs in steady state, and 4.3 W in bursts. We also present an optional Radio Transceiver module (1 g) which, when added to the base headborne device, enables real-time updating of light delivery protocols; dozens of devices can be controlled simultaneously from one computer. We demonstrate use of the technology to wirelessly drive cortical control of movement in mice. These devices may serve as prototypes for clinical ultra-precise neural prosthetics that use light as the modality of biological control.

  • a wirelessly powered and controlled device for optical neural control of freely behaving animals
    Journal of Neural Engineering, 2011
    Co-Authors: Christian T Wentz, Patrick E Monahan, Alexander Guerra, Alexander V Rodriguez, Jacob Bernstein
    Abstract:

    Optogenetics, the ability to use light to activate and silence specific neuron types within neural networks in vivo and in vitro, is revolutionizing neuroscientists’ capacity to understand how defined neural circuit elements contribute to normal and pathological brain functions. Typically awake behaving experiments are conducted by inserting an optical fiber into the brain, tethered to a remote laser, or by utilizing an implanted LED, tethered to a remote power source. A fully wireless system would enable chronic or longitudinal experiments where long duration tethering is impractical, and would also support high-throughput experimentation. However, the high power requirements of light sources (LEDs, lasers), especially in the context of the high-frequency pulse trains often desired in experiments, precludes battery-powered approaches from being widely applicable. We have developed a headborne device weighing 2 grams capable of wirelessly receiving power using a resonant RF power link and storing the energy in an adaptive supercapacitor circuit, which can algorithmically control one or more headborne LEDs via a microcontroller. The device can deliver approximately 2W of power to the LEDs in steady state, and 4.3W in bursts. We also present an optional Radio Transceiver module (1 gram) which, when added to the base headborne device, enables real-time updating of light delivery protocols; dozens of devices can be simultaneously controlled from one computer. We demonstrate use of the technology to wirelessly drive cortical control of movement in mice. These devices may serve as prototypes for clinical ultra-precise neural prosthetics that use light as the modality of biological control.

T Terada - One of the best experts on this subject based on the ideXlab platform.

  • a cmos ultra wideband impulse Radio Transceiver for 1 mb s data communications and spl plusmn 2 5 cm range finding
    IEEE Journal of Solid-state Circuits, 2006
    Co-Authors: T Terada, S Yoshizumi, Muhammad Muqsith, Yukitoshi Sanada, Tadahiro Kuroda
    Abstract:

    A CMOS ultra-wideband impulse Radio (UWB-IR) Transceiver was developed in 0.18-/spl mu/m CMOS technology. It can be used for 1-Mb/s data communications as well as for precise range finding within an error of /spl plusmn/2.5 cm. The power consumptions of the transmitter and receiver for data communication are 0.7 and 4.0 mW, respectively. When an LNA operates intermittently through bias switching, the power consumption of the Transceiver is only 1 mW. The range for data communication is 1 m with BER of 10/sup -3/. For ranging applications, the transmitter can reduce the power to 0.7 /spl mu/W for 1k pulses per second, and the receiver consumes little power. The Transceiver design, all-digital transmitter, and intermittent circuit operation at the receiver reduce the power consumption dramatically, which makes the Transceiver well suited for applications like sensor networks. The electronic field intensity is lower than 35 /spl mu/V/m, and thus the UWB system can be operated even under the current Japan Radio regulations.

  • a cmos ultra wideband impulse Radio Transceiver for 1 mb s data communications and 2 5 cm range finding
    Symposium on VLSI Circuits, 2006
    Co-Authors: T Terada, S Yoshizumi, Muhammad Muqsith, Yukitoshi Sanada, Tadahiro Kuroda
    Abstract:

    A CMOS ultra-wideband impulse Radio (UWB-IR) Transceiver was developed in 0.18-μm CMOS technology. It can be used for 1-Mb/s data communications as well as for precise range finding within an error of +2.5 cm. The power consumptions of the transmitter and receiver for data communication are 0.7 and 4.0 mW, respectively. When an LNA operates intermittently through bias switching, the power consumption of the Transceiver is only 1 mW. The range for data communication is 1 m with BER of 10 -3 . For ranging applications, the transmitter can reduce the power to 0.7 μW for 1k pulses per second, and the receiver consumes little power. The Transceiver design, all-digital transmitter, and intermittent circuit operation at the receiver reduce the power consumption dramatically, which makes the Transceiver well suited for applications like sensor networks. The electronic field intensity is lower than 35 μV/m, and thus the UWB system can be operated even under the current Japan Radio regulations.

Christian T Wentz - One of the best experts on this subject based on the ideXlab platform.

  • a wirelessly powered and controlled device for optical neural control of freely behaving animals
    Journal of Neural Engineering, 2011
    Co-Authors: Christian T Wentz, Jacob G Bernstein, Patrick E Monahan, Alexander Guerra, Alexander V Rodriguez
    Abstract:

    Optogenetics, the ability to use light to activate and silence specific neuron types within neural networks in vivo and in vitro, is revolutionizing neuroscientists' capacity to understand how defined neural circuit elements contribute to normal and pathological brain functions. Typically, awake behaving experiments are conducted by inserting an optical fiber into the brain, tethered to a remote laser, or by utilizing an implanted light-emitting diode (LED), tethered to a remote power source. A fully wireless system would enable chronic or longitudinal experiments where long duration tethering is impractical, and would also support high-throughput experimentation. However, the high power requirements of light sources (LEDs, lasers), especially in the context of the extended illumination periods often desired in experiments, precludes battery-powered approaches from being widely applicable. We have developed a headborne device weighing 2 g capable of wirelessly receiving power using a resonant RF power link and storing the energy in an adaptive supercapacitor circuit, which can algorithmically control one or more headborne LEDs via a microcontroller. The device can deliver approximately 2 W of power to the LEDs in steady state, and 4.3 W in bursts. We also present an optional Radio Transceiver module (1 g) which, when added to the base headborne device, enables real-time updating of light delivery protocols; dozens of devices can be controlled simultaneously from one computer. We demonstrate use of the technology to wirelessly drive cortical control of movement in mice. These devices may serve as prototypes for clinical ultra-precise neural prosthetics that use light as the modality of biological control.

  • a wirelessly powered and controlled device for optical neural control of freely behaving animals
    Journal of Neural Engineering, 2011
    Co-Authors: Christian T Wentz, Patrick E Monahan, Alexander Guerra, Alexander V Rodriguez, Jacob Bernstein
    Abstract:

    Optogenetics, the ability to use light to activate and silence specific neuron types within neural networks in vivo and in vitro, is revolutionizing neuroscientists’ capacity to understand how defined neural circuit elements contribute to normal and pathological brain functions. Typically awake behaving experiments are conducted by inserting an optical fiber into the brain, tethered to a remote laser, or by utilizing an implanted LED, tethered to a remote power source. A fully wireless system would enable chronic or longitudinal experiments where long duration tethering is impractical, and would also support high-throughput experimentation. However, the high power requirements of light sources (LEDs, lasers), especially in the context of the high-frequency pulse trains often desired in experiments, precludes battery-powered approaches from being widely applicable. We have developed a headborne device weighing 2 grams capable of wirelessly receiving power using a resonant RF power link and storing the energy in an adaptive supercapacitor circuit, which can algorithmically control one or more headborne LEDs via a microcontroller. The device can deliver approximately 2W of power to the LEDs in steady state, and 4.3W in bursts. We also present an optional Radio Transceiver module (1 gram) which, when added to the base headborne device, enables real-time updating of light delivery protocols; dozens of devices can be simultaneously controlled from one computer. We demonstrate use of the technology to wirelessly drive cortical control of movement in mice. These devices may serve as prototypes for clinical ultra-precise neural prosthetics that use light as the modality of biological control.

Mohamedslim Alouini - One of the best experts on this subject based on the ideXlab platform.

  • further results on extended delivery time for secondary packet transmission
    IEEE Transactions on Wireless Communications, 2017
    Co-Authors: Muneer Usman, Hongchuan Yang, Mohamedslim Alouini
    Abstract:

    Cognitive Radio Transceiver can opportunistically access the underutilized spectrum resource of primary systems for new wireless services. With interweave cognitive implementation, secondary transmission may be interrupted by primary transmission. To facilitate the packet delay analysis of such secondary transmission, we study the extended delivery time of secondary packet transmission. In particular, we derive the exact distribution function of extended delivery time of a fixed-size secondary packet with non-work-preserving strategy, where interrupted packets must be repeated. We also analyze the effect of imperfect periodic sensing, i.e., the secondary user periodically senses the spectrum for availability, with a chance of missing an available channel on a certain sensing attempt. These results complement previous work on work-preserving strategy with perfect sensing. Selected numerical and simulation results are presented for verifying the mathematical formulation.

  • extended delivery time analysis for cognitive packet transmission with application to secondary queuing analysis
    IEEE Transactions on Wireless Communications, 2015
    Co-Authors: Muneer Usman, Hongchuan Yang, Mohamedslim Alouini
    Abstract:

    Cognitive Radio Transceiver can opportunistically access the underutilized spectrum resource of primary systems for new wireless services. With interweave implementation, the secondary transmission may be interrupted by the primary user's transmission. To facilitate the delay analysis of such secondary transmission for fixed-size secondary packets, we study the resulting extended delivery time that includes both transmission time and waiting time. In particular, we derive the exact distribution functions of extended delivery time of secondary transmission for both continuous sensing and periodic sensing cases. Selected numerical and simulation results are presented for illustrating the mathematical formulation. Finally, we consider an M/G/1 queueing set-up at the secondary transmitter and formulate the closed-form expressions for the expected delay with Poisson traffic. The analytical results will greatly facilitate the design of the secondary system for particular target application.

  • extended delivery time analysis for cognitive packet transmission with application to secondary queuing analysis
    arXiv: Information Theory, 2014
    Co-Authors: Muneer Usman, Hongchuan Yang, Mohamedslim Alouini
    Abstract:

    Cognitive Radio Transceiver can opportunistically access the underutilized spectrum resource of primary systems for new wireless services. With interleave implementation, the secondary transmission may be interrupted by the primary user's transmission. To facilitate the delay analysis of such secondary transmission for a fixed-size secondary packet, we study the resulting extended delivery time that includes both transmission time and waiting time. In particular, we derive the exact distribution function of extended delivery time of secondary transmission for both continuous sensing and periodic sensing cases. Selected numerical and simulation results are presented for illustrating the mathematical formulation. Finally, we consider a generalized M/G/1 queue set-up at the secondary user and formulate the closed-form expressions for the expected delay with Poisson traffic. The analytical results will greatly facilitate the design of the secondary system for particular target application.

  • extended delivery time analysis for non work preserving packet transmission in cognitive environment
    arXiv: Information Theory, 2014
    Co-Authors: Muneer Usman, Hongchuan Yang, Mohamedslim Alouini
    Abstract:

    Cognitive Radio Transceiver can opportunistically access the underutilized spectrum resource of primary systems for new wireless services. With interweave cognitive implementation, the secondary transmission may be interrupted by the primary user's transmission. To facilitate the packet delay analysis of such secondary transmission, we study the resulting extended delivery time that includes both transmission time and waiting time. In particular, we derive the exact distribution function of extended delivery time of a fixed-size secondary packet with non-work-preserving strategy i.e. interrupted packets will be retransmitted. Both continuous sensing and periodic sensing with and without missed detection cases are considered. Selected numerical and simulation results are presented for verifying the mathematical formulation. Finally, we apply the results to secondary queuing analysis with a generalized M/G/1 queue set-up. The analytical results will greatly facilitate the design of the secondary system for particular target application.