The Experts below are selected from a list of 277959 Experts worldwide ranked by ideXlab platform
R.b. Waterhouse - One of the best experts on this subject based on the ideXlab platform.
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millimeter wave broad band fiber Wireless System incorporating baseband data transmission over fiber and remote lo delivery
Journal of Lightwave Technology, 2000Co-Authors: Ampalavanapillai Nirmalathas, R.b. Waterhouse, D Novak, G YoffeAbstract:We present the first demonstration of a millimeter-wave (mm-wave) broadband fiber-Wireless System which incorporates baseband data transmission in both the downstream (622 Mb/s) and upstream (155 Mb/s) directions. The local oscillator (LO) required at the remote antenna base station for up- and downconversion to/from the mm-wave radio frequency (RF) is delivered remotely via a modulation scheme that is tolerant to the effects of fiber chromatic dispersion on the detected LO carrier power. The technique employs a single dual electrode modulator located at the central office (CO) and the data and an RF signal at a frequency equal to half the LO frequency, are applied simultaneously to the device. The modulation scheme was optimized as a function of the modulator operating conditions. Simultaneous bidirectional radio transmission in the mm-wave fiber-Wireless network was implemented using specially designed mm-wave diplexers located at the base station (BS) and customer unit, and a single Ka-band printed antenna array at the BS operating simultaneously in transmit and receive mode. Error-free data transmission was demonstrated for both down(34.8 GHz) and uplinks (37.5 GHz) after 20 km of single-mode optical fiber and a bit error rate (BER) of 10/sup -6/ was achieved after the inclusion of a 2-m radio link.
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37-GHz fiber-Wireless System for distribution of broad-band signals
IEEE Transactions on Microwave Theory and Techniques, 1997Co-Authors: Z. Ahmed, Dalma Novak, R.b. Waterhouse, Hai-fen LiuAbstract:We present a millimeter (mm)-wave fiber-Wireless System suitable for the transport and distribution of broad-band signals. We show transmission over fiber and Wireless distribution of subcarrier multiplexed amplitude-modulation vestigial-sideband (AM-VSB) video and a digital data stream at 37 GHz using optical carriers generated by a hybrid mode-locked laser (HMLL). We also present a simple model to characterize the effect of fiber chromatic dispersion on the transport of mm-wave modulated signals over fiber, and calculations show that by using an HMLL, broad-band signals can be transported successfully over fiber lengths greater than 150 km using subcarrier frequencies
G Yoffe - One of the best experts on this subject based on the ideXlab platform.
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millimeter wave broad band fiber Wireless System incorporating baseband data transmission over fiber and remote lo delivery
Journal of Lightwave Technology, 2000Co-Authors: Ampalavanapillai Nirmalathas, R.b. Waterhouse, D Novak, G YoffeAbstract:We present the first demonstration of a millimeter-wave (mm-wave) broadband fiber-Wireless System which incorporates baseband data transmission in both the downstream (622 Mb/s) and upstream (155 Mb/s) directions. The local oscillator (LO) required at the remote antenna base station for up- and downconversion to/from the mm-wave radio frequency (RF) is delivered remotely via a modulation scheme that is tolerant to the effects of fiber chromatic dispersion on the detected LO carrier power. The technique employs a single dual electrode modulator located at the central office (CO) and the data and an RF signal at a frequency equal to half the LO frequency, are applied simultaneously to the device. The modulation scheme was optimized as a function of the modulator operating conditions. Simultaneous bidirectional radio transmission in the mm-wave fiber-Wireless network was implemented using specially designed mm-wave diplexers located at the base station (BS) and customer unit, and a single Ka-band printed antenna array at the BS operating simultaneously in transmit and receive mode. Error-free data transmission was demonstrated for both down(34.8 GHz) and uplinks (37.5 GHz) after 20 km of single-mode optical fiber and a bit error rate (BER) of 10/sup -6/ was achieved after the inclusion of a 2-m radio link.
Hai-fen Liu - One of the best experts on this subject based on the ideXlab platform.
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37-GHz fiber-Wireless System for distribution of broad-band signals
IEEE Transactions on Microwave Theory and Techniques, 1997Co-Authors: Z. Ahmed, Dalma Novak, R.b. Waterhouse, Hai-fen LiuAbstract:We present a millimeter (mm)-wave fiber-Wireless System suitable for the transport and distribution of broad-band signals. We show transmission over fiber and Wireless distribution of subcarrier multiplexed amplitude-modulation vestigial-sideband (AM-VSB) video and a digital data stream at 37 GHz using optical carriers generated by a hybrid mode-locked laser (HMLL). We also present a simple model to characterize the effect of fiber chromatic dispersion on the transport of mm-wave modulated signals over fiber, and calculations show that by using an HMLL, broad-band signals can be transported successfully over fiber lengths greater than 150 km using subcarrier frequencies
Lui Sha - One of the best experts on this subject based on the ideXlab platform.
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Model-Based Analysis of Wireless System Architectures for Real-Time Applications
IEEE Transactions on Mobile Computing, 2013Co-Authors: Kyungtae Kang, Min-young Nam, Lui ShaAbstract:We propose a model-based description and analysis framework for the design of Wireless System architectures. Its aim is to address the shortcomings of existing approaches to System verification and the tracking of anomalies in safety-critical Wireless Systems. We use Architecture Analysis and Description Language (AADL) to describe an analysis-oriented architecture model with highly modular components. We also develop the cooperative tool chains required to analyze the performance of a Wireless System by simulation. We show how this framework can support a detailed and largely automated analysis of a complicated, networked Wireless System using examples from Wireless healthcare and video broadcasting.
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Design and QoS of a Wireless System for Real-Time Remote Electrocardiography
IEEE journal of biomedical and health informatics, 2013Co-Authors: Kyungtae Kang, Junhee Ryu, Junbeom Hur, Lui ShaAbstract:Quality of service (QoS) and, in particular, reliability and a bounded low latency are essential attributes of safety-critical Wireless Systems for medical applications. However, Wireless links are typically prone to bursts of errors, with characteristics which vary over time. We propose a Wireless System suitable for real-time remote patient monitoring in which the necessary reliability and guaranteed latency are both achieved by an efficient error control scheme. We have paired an example remote electrocardiography application to this Wireless System. We also developed a tool chain that uses a formal description of the proposed Wireless medical System architecture in the architecture analysis and design language to assess various combinations of System parameters: we can determine the QoS in terms of packet-delivery ratio and the service latency, and also the size of jitter buffer required for seamless ECG monitoring. A realistic assessment, based on data from the MIT-BIT arrhythmia database, shows that the proposed Wireless System can achieve an appropriate level of QoS for real-time ECG monitoring if link-level error control is correctly implemented. Additionally, we present guidelines for the design of energy-efficient link-level error control, derived from energy data, obtained from simulations.
Dalma Novak - One of the best experts on this subject based on the ideXlab platform.
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implementation of an upstream path in a millimeter wave fiber Wireless System
Optical Fiber Communication Conference, 1998Co-Authors: Christina Lim, Dalma Novak, G H SmithAbstract:Summary form only given. We demonstrate a simple method for upstream data transmission in a mm-wave fiber-Wireless System that incorporates a multisection semiconductor laser as the mm-wave optical transmitter at the remote base station. 51.8 Mbit/s of data at 36.8 GHz is first transported over a 5-m Wireless link from the customer unit to the antenna base station, followed by transmission over 40 km of optical fiber back to the central office. We also show theoretically and experimentally that fiber transmission of modulated mm-wave signals via direct modulation of the multisection laser is not significantly affected by fiber chromatic dispersion.
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37-GHz fiber-Wireless System for distribution of broad-band signals
IEEE Transactions on Microwave Theory and Techniques, 1997Co-Authors: Z. Ahmed, Dalma Novak, R.b. Waterhouse, Hai-fen LiuAbstract:We present a millimeter (mm)-wave fiber-Wireless System suitable for the transport and distribution of broad-band signals. We show transmission over fiber and Wireless distribution of subcarrier multiplexed amplitude-modulation vestigial-sideband (AM-VSB) video and a digital data stream at 37 GHz using optical carriers generated by a hybrid mode-locked laser (HMLL). We also present a simple model to characterize the effect of fiber chromatic dispersion on the transport of mm-wave modulated signals over fiber, and calculations show that by using an HMLL, broad-band signals can be transported successfully over fiber lengths greater than 150 km using subcarrier frequencies
