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Author: search.filters.author.Boonpiyathud, Sitchai

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    Microwave line-of-sight path loss prediction on urban street by fuzzy logic model
    (2005-12-01)
    Phaiboon, Supachai
    ;
    Phokharatkul, Pisit
    ;
    Somkuarnpanit, Suripon
    ;
    Boonpiyathud, Sitchai
    This paper proposes a method to model the path loss characteristics on urban streets in the microwave band. We applied the concept of fuzzy logic to predict path losses. The input fuzzy sets were classified into five sets, namely 1) Distance between transmitter and receiver, 2) Frequency, 3) Time of day, 4) Transmitting antenna height and 5) Receiving antenna height. These inputs are then inferenced into output path loss via linguistic rules which were trained by measurement. To check the proposed model, we compared the fuzzy prediction with the same and an another measurement. The results show that the fuzzy logic models provided a better prediction. © 2005 IEEE.
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    Upper-and lower-bound path-loss modeling for indoor line-of-sight environments
    (2005-01-01)
    Phaiboon, Supachai
    ;
    Phokharatkul, Pisit
    ;
    Somkuarnpanit, Suripon
    ;
    Boonpiyathud, Sitchai
    This paper proposes a method to predict line-of-sight (LOS) path loss in buildings. We performed measurements in two different type of buildings at a frequency of 1.8 GHz and propose upper-and-lower bounds path loss models which depend on max and min values of sample path loss data. This makes our models limit path loss within the boundary lines. The models include time-variant effects such as people moving and cars in parking areas with their influence on wave propagation that is very high. The results have shown that the proposed models will be useful for the system and cell design of indoor wireless communication systems. © 2005 IEEE.