The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

R. Kawasaki - One of the best experts on this subject based on the ideXlab platform.

  • Multipath Propagation model for line-of-sight street microcells in urban area
    IEEE Transactions on Vehicular Technology, 2000
    Co-Authors: Shinichi Ichitsubo, T. Furuno, Tokio Taga, R. Kawasaki
    Abstract:

    This paper proposes a Multipath Propagation model for line-of-sight (LOS) street microcells with building roof base sites (BS) in urban areas, Multipath Propagation characteristics are of great importance in evaluating the performance of digital systems and designing wireless links. Typical delay profiles are measured to clarify their statistical characteristics in LOS street microcells. The channel sounder used is a sliding correlator with 30-Mb/s PN code and a center frequency of 2.6 GHz. The measurements clarify the features of delay profile and mean RMS delay spread. The proposed delay profile model explains one plausible mechanism of Multipath Propagation. The delay profiles calculated using the model agreed well with the measured profiles. Furthermore, the factors influencing the RMSs delay spread are investigated, and the regression equation of medium RMS delay spread on a sidewalk is established. The proposed model can evaluate the transmission characteristics of wireless digital communication systems in Multipath Propagation environments.

  • Multipath Propagation model for line-of-sight street microcells in urban areas
    Proceedings of ICUPC - 5th International Conference on Universal Personal Communications, 1996
    Co-Authors: Shinichi Ichitsubo, Taiji Furuno, Toshihiro Nagato, Tetsuya Taga, R. Kawasaki
    Abstract:

    A Multipath Propagation model and a prediction equation for r.m.s. delay spread are discussed for LOS street microcells with building roof base sites in urban areas. The proposed model is established to explain a mechanism of Multipath Propagation. The delay profiles calculated using the model agreed well with the measured profiles. The factors influencing the r.m.s. delay spread are investigated based on the model, then it is found that the factors are LOS and road width, etc. The prediction equation for medium r.m.s. delay spread based on those factors is proposed.

  • A statistical model for microcellular Multipath Propagation environment
    1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1
    Co-Authors: Shinichi Ichitsubo, T. Furuno, R. Kawasaki
    Abstract:

    Multipath Propagation characteristics are of great importance in evaluating the performance of digital systems and designing wireless links. This paper describes statistical Multipath Propagation modeling for microcells in indoor, pedestrian, and vehicular environments. The channel impulse response is measured to clarify the statistical characteristics in urban areas, residential areas and indoors. The measuring channel sounder is the sliding correlator using 30 Mbit/s PN code with center frequency of 2.6 GHz. The measurements clarify the features of delay profile, mean RMS (root mean square) delay spread and local (or instantaneous) RMS delay spread. Furthermore, tapped-delay-line parameters for Multipath Propagation simulators based on this modeling are proposed. The proposed model is applicable to the evaluation of transmission characteristics of wireless digital communication systems in Multipath fading environments.

Shinichi Ichitsubo - One of the best experts on this subject based on the ideXlab platform.

  • Multipath Propagation model for line-of-sight street microcells in urban area
    IEEE Transactions on Vehicular Technology, 2000
    Co-Authors: Shinichi Ichitsubo, T. Furuno, Tokio Taga, R. Kawasaki
    Abstract:

    This paper proposes a Multipath Propagation model for line-of-sight (LOS) street microcells with building roof base sites (BS) in urban areas, Multipath Propagation characteristics are of great importance in evaluating the performance of digital systems and designing wireless links. Typical delay profiles are measured to clarify their statistical characteristics in LOS street microcells. The channel sounder used is a sliding correlator with 30-Mb/s PN code and a center frequency of 2.6 GHz. The measurements clarify the features of delay profile and mean RMS delay spread. The proposed delay profile model explains one plausible mechanism of Multipath Propagation. The delay profiles calculated using the model agreed well with the measured profiles. Furthermore, the factors influencing the RMSs delay spread are investigated, and the regression equation of medium RMS delay spread on a sidewalk is established. The proposed model can evaluate the transmission characteristics of wireless digital communication systems in Multipath Propagation environments.

  • Multipath Propagation model for line-of-sight street microcells in urban areas
    Proceedings of ICUPC - 5th International Conference on Universal Personal Communications, 1996
    Co-Authors: Shinichi Ichitsubo, Taiji Furuno, Toshihiro Nagato, Tetsuya Taga, R. Kawasaki
    Abstract:

    A Multipath Propagation model and a prediction equation for r.m.s. delay spread are discussed for LOS street microcells with building roof base sites in urban areas. The proposed model is established to explain a mechanism of Multipath Propagation. The delay profiles calculated using the model agreed well with the measured profiles. The factors influencing the r.m.s. delay spread are investigated based on the model, then it is found that the factors are LOS and road width, etc. The prediction equation for medium r.m.s. delay spread based on those factors is proposed.

  • A statistical model for microcellular Multipath Propagation environment
    1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1
    Co-Authors: Shinichi Ichitsubo, T. Furuno, R. Kawasaki
    Abstract:

    Multipath Propagation characteristics are of great importance in evaluating the performance of digital systems and designing wireless links. This paper describes statistical Multipath Propagation modeling for microcells in indoor, pedestrian, and vehicular environments. The channel impulse response is measured to clarify the statistical characteristics in urban areas, residential areas and indoors. The measuring channel sounder is the sliding correlator using 30 Mbit/s PN code with center frequency of 2.6 GHz. The measurements clarify the features of delay profile, mean RMS (root mean square) delay spread and local (or instantaneous) RMS delay spread. Furthermore, tapped-delay-line parameters for Multipath Propagation simulators based on this modeling are proposed. The proposed model is applicable to the evaluation of transmission characteristics of wireless digital communication systems in Multipath fading environments.

A. Angus - One of the best experts on this subject based on the ideXlab platform.

  • Visual Information Processing - Strange attractors in Multipath Propagation: detection and characterization
    Visual Information Processing, 1992
    Co-Authors: C. Tannous, R. Davies, A. Angus
    Abstract:

    Multipath Propagation of radio waves in indoor/outdoor environments shows a highly irregular behavior as a function of time. Typical modeling of this phenomenon assumes the received signal is a stochastic process composed of the superposition of various altered replicas of the transmitted one, their amplitudes and phases being drawn from specific probability densities. We set out to explore the hypothesis of the presence of deterministic chaos in signals propagating inside various buildings at the University of Calgary. The correlation dimension versus embedding dimension saturates to a value between 3 and 4 for various antenna polarizations. The full Liapunov spectrum calculated contains two positive exponents and yields through the Kaplan-Yorke conjecture the same dimension obtained from the correlation sum. The presence of strange attractors in Multipath Propagation hints to better ways to predict the behavior of the signal and better methods to counter the effects of interference. The use of Neural Networks in non linear prediction will be illustrated in an example and potential applications will be highlighted.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

  • Strange attractors in Multipath Propagation
    IEEE Transactions on Communications, 1991
    Co-Authors: C. Tannous, R. Davies, A. Angus
    Abstract:

    The estimation of the correlation dimension of Multipath Propagation signals in an indoor environment, indicates the presence of a strange attractor of dimension between four and five, suggesting deterministic chaos. The authors stress that although the profiles they examined show saturation in all three experimental configurations, indicating that they would be able to describe their data with a set of at most five nonlinear differential equations, investigation in other Propagation situations is needed. An example of the detection of the presence of strange attractors in radar clutter is presented.

Masaharu Hata - One of the best experts on this subject based on the ideXlab platform.

  • measured path loss and Multipath Propagation characteristics in uhf and microwave frequency bands for urban mobile communications
    Vehicular Technology Conference, 2001
    Co-Authors: R Tsuchihashi, K Tsunekawa, Masaharu Hata
    Abstract:

    This paper presents the frequency dependence of Propagation loss and Multipath Propagation characteristics for urban mobile communications based on measurement results in Japanese urban areas. Path loss in reference frequencies from 457.2 MHz to 15.45 GHz increases according to the free space Propagation power law in terms of frequency dependence for both macrocell and microcell environments. The standard deviation of each frequency band exhibits similar values. Wide-band Propagation measurements show analogous characteristics among frequency bands from 3 to 15 GHz in urban Multipath Propagation. These measurement results show that the dominant difference among frequencies is found in only free space characteristics in terms of frequency dependence from the UHF to microwave frequency bands.

Tokio Taga - One of the best experts on this subject based on the ideXlab platform.

  • Multipath Propagation model for line-of-sight street microcells in urban area
    IEEE Transactions on Vehicular Technology, 2000
    Co-Authors: Shinichi Ichitsubo, T. Furuno, Tokio Taga, R. Kawasaki
    Abstract:

    This paper proposes a Multipath Propagation model for line-of-sight (LOS) street microcells with building roof base sites (BS) in urban areas, Multipath Propagation characteristics are of great importance in evaluating the performance of digital systems and designing wireless links. Typical delay profiles are measured to clarify their statistical characteristics in LOS street microcells. The channel sounder used is a sliding correlator with 30-Mb/s PN code and a center frequency of 2.6 GHz. The measurements clarify the features of delay profile and mean RMS delay spread. The proposed delay profile model explains one plausible mechanism of Multipath Propagation. The delay profiles calculated using the model agreed well with the measured profiles. Furthermore, the factors influencing the RMSs delay spread are investigated, and the regression equation of medium RMS delay spread on a sidewalk is established. The proposed model can evaluate the transmission characteristics of wireless digital communication systems in Multipath Propagation environments.