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Wideband antenna performance evaluation for ultra wideband communication system
(2018-07-02)
Ruethorn, Issaree
;
Promwong, Sathaporn
The transmission loss in modern wireless communication systems is usually evaluate by Friis' formula. However, ultra wideband communication systems cannot apply its directly because the transmission waveform for the ultra wideband is difference from the other wireless communication systems. In this paper, the performance of the ultra wideband antenna with the measurement data of the transmission waveform based on Friis' formula and correlation receiver are presented. This scheme used to evaluate formula for the transmission waveform of the ultra wideband communication system. The distortion will be consider the receiver waveform and antenna should be known. Since the ultra wideband transmission waveform are pulse-shaping by the antenna, difference parameter of the antenna is investigated, especially the effect of the antenna performance and waveform template.
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Distortion Analysis of the HB-UWB Transmission Waveform for WBAN Applications
(2018-07-02)
Sanguanpuak, Chanidaphar
;
Bunlaksananusorn, Chanin
;
Promwong, Sathaporn
The body area network (BAN) is a wireless technology, which play an important role in very short range wireless communications and find a wide variety of applications such as WiMedia for relaying information gathered by biological sensors on body. The ultra wideband (UWB) technology is suitable for BAN system because of transmission by impulse radio and low power. However, signal distortion due to human body effect in human body-ultrawide band (HB-UWB) channel must be study. In this study, we evaluate HB-UWB channel which serious disturbed by the distortion. The distortion can cause extremely poor signal quality to wireless transmission channel even in free space because of the antenna characteristics and waveform distortion. Thus, the understanding of the effect from characterization of antenna and waveform effect is important. The measurement data of distortion analysis due the antenna and human body of HB-UWB for WBAN were presented in this research report. The receiver waveform template was present to maximize system signal to noise ration. The equation of Friis had been used to evaluate the results. The proposed method is practical for the HB-UWB evaluation, UWB antenna design, and provide more precision to identify the waveform distortion. The results can apply for the design of wireless medical devices which focus on the effect of human body.
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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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A study of HB-UWB transfer function model for wireless body area network
(2018-06-08)
Promsrisawat, Pichayanan
;
Promwong, Sathaporn
Many research on wireless communication technologies for short range communication systems. The human body (HB) on ultra wideband (UWB) technology should be study. The wireless HB-UWB transmission waveform can be extremely distorted through a channel even for free-space transmission because of wideband antenna dispersion in HB-UWB system. Therefore, the understand of antenna characteristics with human body, which effects on waveform distortion, is necessary. This paper presents the waveform distortion due to human body in transfer function for wireless body area network (WBAN) applications based on HB-UWB measurement data. The template waveform is considered at the receiver side to maximize the signal to noise ratio (SNR) for evaluation. In this results are evaluate based on the extended Friis' transmission formula. This technique gives very accurate results and is very useful for the design and evaluation of HB-UWB transmission waveform for WBAN technology, especially focusing on the effect of template waveform and waveform distortion in HB-UWB transfer function.

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