The Experts below are selected from a list of 16848 Experts worldwide ranked by ideXlab platform

Adam L Schwartz - One of the best experts on this subject based on the ideXlab platform.

  • Link Budget analysis and throughput measurement for multi antennas wimedia uwb systems
    Vehicular Technology Conference, 2009
    Co-Authors: Lebing Liu, Xiaodai Dong, Zhuangzhuang Tian, Adam L Schwartz
    Abstract:

    This paper examines a WiMedia UWB product by performing comprehensive throughput measurements and a path loss and Link Budget analysis based on the measured data in office and residential environments. The UWB product conforms to WiMedia's multi-band orthogonal frequency division multiplex- ing specification. The Link Budget analysis results together with detailed throughput versus range measurements demonstrate the impressive performance of the WiMedia UWB module for high speed data transfer under very low power constraint, e.g., 0 dB fade margin and capable of supporting up to 324 Mb/s in iPERF.

  • VTC Fall - Link Budget Analysis and Throughput Measurement for Multi-Antennas WiMedia UWB Systems
    2009 IEEE 70th Vehicular Technology Conference Fall, 2009
    Co-Authors: Lebing Liu, Xiaodai Dong, Zhuangzhuang Tian, Adam L Schwartz
    Abstract:

    This paper examines a WiMedia UWB product by performing comprehensive throughput measurements and a path loss and Link Budget analysis based on the measured data in office and residential environments. The UWB product conforms to WiMedia's multi-band orthogonal frequency division multiplex- ing specification. The Link Budget analysis results together with detailed throughput versus range measurements demonstrate the impressive performance of the WiMedia UWB module for high speed data transfer under very low power constraint, e.g., 0 dB fade margin and capable of supporting up to 324 Mb/s in iPERF.

L.p. Ligthart - One of the best experts on this subject based on the ideXlab platform.

  • Link Budget Analysis and Modeling of Short-Range UWB Channels
    IEEE Transactions on Antennas and Propagation, 2008
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    Ultrawideband (UWB) technology is an attractive alternative for short-range applications, e.g., wireless personal area networks. In these applications, transmit and receive antennas are very close to each other and the far-field condition assumed in most of the Link Budget models may not be satisfied. Under near-field conditions, variations in the Link Budget and pulse shape compared to the far-field can be observed. In this work, a novel line-of-sight UWB Link Budget model for very short distances is proposed and validated with measurements using different types of antennas. The proposed model, which takes into account all main near-field effects (i.e., phase error, antenna mismatch and reradiation between antennas) and includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements. This model has also been applied to dispersive antennas (e.g., notch-antennas), and can be used in the design and analysis of short-range UWB communication systems.

  • analysis and modeling of near field effects on the Link Budget for uwb wpan channels
    International Conference on Communications, 2008
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    Wireless personal area networks applications may benefit from the use of ultra-wideband (UWB) technology. In these applications transmit and receive antennas are very close to each other and the far-field condition assumed in most of the Link Budget models may not be satisfied. Under near- field conditions, variations in the Link Budget and pulse shape compared to the far-field can be observed. In this work, a new UWB Link Budget model for very short distances is proposed and validated with measurements using different types of antennas. The measurements have been performed in the time domain by exciting the antenna with very short pulse of 35 ps width covering a large frequency band. The proposed model, which includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements.

  • ICC - Analysis and Modeling of Near-Field Effects on the Link Budget for UWB-WPAN Channels
    2008 IEEE International Conference on Communications, 2008
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    Wireless personal area networks applications may benefit from the use of ultra-wideband (UWB) technology. In these applications transmit and receive antennas are very close to each other and the far-field condition assumed in most of the Link Budget models may not be satisfied. Under near- field conditions, variations in the Link Budget and pulse shape compared to the far-field can be observed. In this work, a new UWB Link Budget model for very short distances is proposed and validated with measurements using different types of antennas. The measurements have been performed in the time domain by exciting the antenna with very short pulse of 35 ps width covering a large frequency band. The proposed model, which includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements.

  • The effect of antenna and pulse waveform on ultra wide band Link Budget with impulse radio transmission
    2004
    Co-Authors: Z. Irahhauten, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    this paper, a Link Budget calculation for the Ultra Wide Band Impulse Radio (UWB-IR) transmission is evaluated. The novel Link Budget expression is derived and the impact of the antenna gain as well as the waveform of the generator ootput on the received voltage is investigated. UWB time domain measurements were performed to validate the Link Budget model. Results can be used in the design and coverage of UWB wireless communication systems.

Sathaporn Promwong - One of the best experts on this subject based on the ideXlab platform.

  • The Link Budget evaluation of ultra wideband impulse radio transmission systems
    2009 9th International Symposium on Communications and Information Technology, 2009
    Co-Authors: Phattharamon Juengkittikul, Sathaporn Promwong
    Abstract:

    The Link Budget of the transmission gain is usually evaluated by using the Friis' transmission formula. However, it is not directly applicable to ultra wideband impulse radio (UWB-IR) transmission systems. This paper presents the Link Budget evaluation formula in the term of transmission gain for the UWB-IR systems that takes into account the transmitted waveform, its distortion due to the antennas, the channel and the correlation receiver. Since the antennas are significant pulse-shaping filters in UWB-IR, the various kinds of the antennas are experimentally examined, especially focused on the effect of the received signal and the isotropic template waveforms.

  • Free space Link Budget evaluation of UWB-IR systems
    2004 International Workshop on Ultra Wideband Systems Joint with Conference on Ultra Wideband Systems and Technologies. Joint UWBST & IWUWBS 2004 (IEE, 2004
    Co-Authors: Sathaporn Promwong, W. Hachitani, Jun-ichi Takada
    Abstract:

    Ultra wideband impulse radio (UWB-IR) technology is an ideal candidate for wireless networks that can be utilized for short-range, high-speed, low power, and low cost indoor applications. The Link Budget of the free space propagation loss is usually estimated by using Friis' transmission formula. However, it is not directly applicable to ultra wideband impulse radio transmission systems, in particular the single band impulse radio, as the formula is expressed as a function of the frequency. Moreover, the waveform may be distorted due to the frequency characteristics of the antenna, and the comparison between Tx and Rx waveforms is not straightforward. The paper discusses the free space Link Budget evaluation of UWB-IR systems based on the extended Friis' transmission formula. The matched filter is considered at the receiver side to maximize the SNR for evaluation. An experimental evaluation of the antenna transfer function needs the three-antenna method for the calibration of the reference antenna. The technique gives very accurate results and is very useful for design and evaluation of UWB impulse radio transmission systems, especially for the evaluation of waveform distortion effects.

  • free space Link Budget estimation scheme for ultra wideband impulse radio with imperfect antennas
    IEICE Electronics Express, 2004
    Co-Authors: Sathaporn Promwong, Jun-ichi Takada
    Abstract:

    The ultra wideband (UWB) radio has been a promising technology for the short range wireless systems. The frequency-dependent behavior of the antennas are not negligible in UWB systems, especially in the impulse radio (IR).This letter presents the extension of the Friis' transmission formula for the Link Budget estimation of UWB radio, considering the transmit signal waveform and the imperfect antennas. The results presented here give the upper bound of the transmission gain, irrespective of the waveform distortion due to the frequency response of the antenna.

Z. Irahhauten - One of the best experts on this subject based on the ideXlab platform.

  • Link Budget Analysis and Modeling of Short-Range UWB Channels
    IEEE Transactions on Antennas and Propagation, 2008
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    Ultrawideband (UWB) technology is an attractive alternative for short-range applications, e.g., wireless personal area networks. In these applications, transmit and receive antennas are very close to each other and the far-field condition assumed in most of the Link Budget models may not be satisfied. Under near-field conditions, variations in the Link Budget and pulse shape compared to the far-field can be observed. In this work, a novel line-of-sight UWB Link Budget model for very short distances is proposed and validated with measurements using different types of antennas. The proposed model, which takes into account all main near-field effects (i.e., phase error, antenna mismatch and reradiation between antennas) and includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements. This model has also been applied to dispersive antennas (e.g., notch-antennas), and can be used in the design and analysis of short-range UWB communication systems.

  • analysis and modeling of near field effects on the Link Budget for uwb wpan channels
    International Conference on Communications, 2008
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    Wireless personal area networks applications may benefit from the use of ultra-wideband (UWB) technology. In these applications transmit and receive antennas are very close to each other and the far-field condition assumed in most of the Link Budget models may not be satisfied. Under near- field conditions, variations in the Link Budget and pulse shape compared to the far-field can be observed. In this work, a new UWB Link Budget model for very short distances is proposed and validated with measurements using different types of antennas. The measurements have been performed in the time domain by exciting the antenna with very short pulse of 35 ps width covering a large frequency band. The proposed model, which includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements.

  • ICC - Analysis and Modeling of Near-Field Effects on the Link Budget for UWB-WPAN Channels
    2008 IEEE International Conference on Communications, 2008
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    Wireless personal area networks applications may benefit from the use of ultra-wideband (UWB) technology. In these applications transmit and receive antennas are very close to each other and the far-field condition assumed in most of the Link Budget models may not be satisfied. Under near- field conditions, variations in the Link Budget and pulse shape compared to the far-field can be observed. In this work, a new UWB Link Budget model for very short distances is proposed and validated with measurements using different types of antennas. The measurements have been performed in the time domain by exciting the antenna with very short pulse of 35 ps width covering a large frequency band. The proposed model, which includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements.

  • A Link Budget Model for UWB-WPAN Applications
    2006 European Conference on Wireless Technologies, 2006
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar
    Abstract:

    Ultra wide band (UWB) technology is prone to be used in wireless personal area networks (WPAN) applications. In these applications transmit and receive antennas are very close to each other and the far field condition assumed in most of the Link Budget models may not be satisfied. Under near field conditions, variations in the Link Budget and pulse shape with respect to the far field can be observed. In this work, near field WPAN measurements have been carried out with three different bi-conical antennas in order to analyze the Link Budget. A new Link Budget model is proposed and compared with the measurements. Results can be used in the design and coverage analysis of UWB communication systems for WPAN applications

  • The effect of antenna and pulse waveform on ultra wide band Link Budget with impulse radio transmission
    2004
    Co-Authors: Z. Irahhauten, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    this paper, a Link Budget calculation for the Ultra Wide Band Impulse Radio (UWB-IR) transmission is evaluated. The novel Link Budget expression is derived and the impact of the antenna gain as well as the waveform of the generator ootput on the received voltage is investigated. UWB time domain measurements were performed to validate the Link Budget model. Results can be used in the design and coverage of UWB wireless communication systems.

Homayoun Nikookar - One of the best experts on this subject based on the ideXlab platform.

  • Link Budget Analysis and Modeling of Short-Range UWB Channels
    IEEE Transactions on Antennas and Propagation, 2008
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    Ultrawideband (UWB) technology is an attractive alternative for short-range applications, e.g., wireless personal area networks. In these applications, transmit and receive antennas are very close to each other and the far-field condition assumed in most of the Link Budget models may not be satisfied. Under near-field conditions, variations in the Link Budget and pulse shape compared to the far-field can be observed. In this work, a novel line-of-sight UWB Link Budget model for very short distances is proposed and validated with measurements using different types of antennas. The proposed model, which takes into account all main near-field effects (i.e., phase error, antenna mismatch and reradiation between antennas) and includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements. This model has also been applied to dispersive antennas (e.g., notch-antennas), and can be used in the design and analysis of short-range UWB communication systems.

  • analysis and modeling of near field effects on the Link Budget for uwb wpan channels
    International Conference on Communications, 2008
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    Wireless personal area networks applications may benefit from the use of ultra-wideband (UWB) technology. In these applications transmit and receive antennas are very close to each other and the far-field condition assumed in most of the Link Budget models may not be satisfied. Under near- field conditions, variations in the Link Budget and pulse shape compared to the far-field can be observed. In this work, a new UWB Link Budget model for very short distances is proposed and validated with measurements using different types of antennas. The measurements have been performed in the time domain by exciting the antenna with very short pulse of 35 ps width covering a large frequency band. The proposed model, which includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements.

  • ICC - Analysis and Modeling of Near-Field Effects on the Link Budget for UWB-WPAN Channels
    2008 IEEE International Conference on Communications, 2008
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    Wireless personal area networks applications may benefit from the use of ultra-wideband (UWB) technology. In these applications transmit and receive antennas are very close to each other and the far-field condition assumed in most of the Link Budget models may not be satisfied. Under near- field conditions, variations in the Link Budget and pulse shape compared to the far-field can be observed. In this work, a new UWB Link Budget model for very short distances is proposed and validated with measurements using different types of antennas. The measurements have been performed in the time domain by exciting the antenna with very short pulse of 35 ps width covering a large frequency band. The proposed model, which includes frequency, antenna size and orientation as parameters, shows a good agreement with the simulations and the measurements.

  • A Link Budget Model for UWB-WPAN Applications
    2006 European Conference on Wireless Technologies, 2006
    Co-Authors: Z. Irahhauten, Javier Dacuña, Gerard J. M. Janssen, Homayoun Nikookar
    Abstract:

    Ultra wide band (UWB) technology is prone to be used in wireless personal area networks (WPAN) applications. In these applications transmit and receive antennas are very close to each other and the far field condition assumed in most of the Link Budget models may not be satisfied. Under near field conditions, variations in the Link Budget and pulse shape with respect to the far field can be observed. In this work, near field WPAN measurements have been carried out with three different bi-conical antennas in order to analyze the Link Budget. A new Link Budget model is proposed and compared with the measurements. Results can be used in the design and coverage analysis of UWB communication systems for WPAN applications

  • The effect of antenna and pulse waveform on ultra wide band Link Budget with impulse radio transmission
    2004
    Co-Authors: Z. Irahhauten, Gerard J. M. Janssen, Homayoun Nikookar, Alexander Yarovoy, L.p. Ligthart
    Abstract:

    this paper, a Link Budget calculation for the Ultra Wide Band Impulse Radio (UWB-IR) transmission is evaluated. The novel Link Budget expression is derived and the impact of the antenna gain as well as the waveform of the generator ootput on the received voltage is investigated. UWB time domain measurements were performed to validate the Link Budget model. Results can be used in the design and coverage of UWB wireless communication systems.