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Author: search.filters.author.Chamchoy, MonchaiSubject: search.filters.subject.Human body shadowing

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    A body-shadowing model for indoor UWB communication environments
    (2008-10-06)
    Seesai, Waraporn
    ;
    Chamchoy, Monchai
    ;
    Promwong, Sathaporn
    Radio channel characteristic is a very important factor for designing indoor UWB communication network. As we know, the indoor communication channel is limited by geometry of room and some obstruction in that room such as furniture, human operator, etc. These obstructions directly affect to quality of received signal, especially human who usually obstruct receiving signal. To efficient the network designing, the influence of human body shadowing on radio propagation in building UWB communication is investigated by involving propagation prediction model. This model will predict characteristics of the received signal affected from body shadowing by considering many wave propagation phenomenons such as reflection, refraction, absorption, etc. based on ray-tracing technique. The predicted results are shown in various forms such as power loss of received signal, mean excess delay and power delay profile. To verify the validation of the model, these results will be compared with the measured results. It is found that the measurement and prediction results are closely related. ©2008 IEEE.
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    Investigation of ultra-wideband pulse distortion due to the body shadowing
    (2005-12-01)
    Pradabphon, Apichit
    ;
    Doungdeun, Worawoot
    ;
    Chamchoy, Monchai
    ;
    Supanakoon, Pichaya
    ;
    Promwong, Sathaporn
    In this paper, the distortion of ultra-wideband (UWB) pulse due to the human body shadowing is investigated. The frequency responses of the radio channels are acquired by using a vector network analyzer (VNA) over the frequency bandwidth of 3 GHz to 11 GHz. The experimental channels are taken for several T-R separation distances in the indoor environment. Consequently, the characteristics of the UWB pulse distortion including the effect of transmitter/receiver antennas and human body are examined. The pulse distortion is considered by using the percentage of the correlation coefficient between the transmitted signal and the received signal. As the results, the distortion of UWB pulse increases as the T-R separation distance increases, especially when the fully shadowing is observed. © 2005 IEEE.