Chamchoy, Monchai

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Chamchoy, Monchai
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Email
monchai.ch@kmitl.ac.th

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    Item type:Publication,
    Evaluation of WUWB Transmission with LOS and NLOS for Smart Home
    (2018-07-02)
    Chamchoy, Monchai
    ;
    Suwan, Supakorn
    ;
    Airphaiboon, Surapan
    ;
    Promwong, Sathaporn
    Wireless ultra-wideband communications technology (WUWB) is a fast popular technology because many unique attractive features that promotes development about wireless communications, networking. WUWB has so high elevated and also allows the force spectral intensity to be so few, and the force limits on UWB are being severely limited by the regulatory bodies. Technology offers plenty advantages, particularly about terms of so high data transmission rates which are good above those probable with currently deployed technologies. The optimization of data transmission is to use multiantenna WUWB method. So, as an alternative, a multiantenna can be used to reduce the error rate as well as improve the quality and capability of wireless transmission by directing, with an aim to adventure the spatial diversity in the channel. The benefits of such a system can be found in independent relationships. This paper presents the spatial effects about transmitter/receiver relations for multiantenna UWB systems under line-of-sight (LOS) and non-line-of-sight (NLOS) situation. A comparison results exhibit that the relations reduce as the antenna length expand for the scenario. In the example of a NLOS situation, the relations does not rely on the spacing.
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    Evaluation of DVB-T2 transmission channel in Bangkok, Thailand
    (2017-04-19)
    Suwansukho, Nattapan
    ;
    Promwong, Sathaporn
    ;
    Chamchoy, Monchai
    This paper describes the evaluation of DVB-T2 transmission channel in Bangkok Thailand. The DVB-T2 test signal is transmitted in Bangkok Thailand. Type of transmission channel were used including Gaussian, Rician for fix rooftop reception. The measurements are consisting of a several environments such as open area, urban area, high building area. The measurement result are include Power Output from transmitter after combiner, LBER, bBER, NsMAR (Noise Margin), MER (Modulation Error Ratio), SNR (Signal to Noise Ratio), CNR (Carrier to Noise Ratio), and Signal. The measurement result of this paper lead to the evaluation of DVB-T2 transmission channel for environment of Bangkok, Thailand and could be useful to improve and to design the digital television broadcasting network in Thailand especially in urban area like Bangkok.
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    Study on RSRP of LTE Mobile Phone on Thailand's National Highway
    (2018-07-02)
    Supanakoon, Pichaya
    ;
    Jantana, Trin
    ;
    Chamchoy, Monchai
    Reference signal received power (RSRP) is an important parameter, which is used to consider the handover between cells of long term evolution (LTE) mobile phone. In this paper, the RSRP of LTE mobile phone on Thailand's national highway is studied. The user equipment (UE), Samsung Galaxy J2 Prime smartphone with service mode, is used to measure the RSRP of all 3 LTE mobile phone operators on Thailand's national highways no. 3 and 361 in Mueang Chonburi District, Chonburi Province. The RSRP along the highways is shown and is studied in terms of probability density function (PDF) and cumulative distribution function (CDF) of Gaussian distribution. The obtained statistical characteristics of RSRP are discussed in conclusion.