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Experimental Evaluation of UWB-HB Transfer Function with LOS and NLOS for WBAN
(2022-01-01)
Promwong, Sathaporn
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Tiengthong, Thanadol
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Chaisang, Aditep
Short-range wireless communication with low power and high data rate is a key to the future development of wireless body area network systems. Ultra-wideband technology can achieve the primary wireless communication requirements around the human vicinity. Hence, understanding the human body's effect on wireless communication systems is very important to investigate. This paper will present the evaluation scheme for the ultra-wideband human body channel characteristics in an indoor environment. The experimental is divided into two different scenarios, i.e., line-of-sight and non-line-of-sight, based on the actual wireless body area network applications. The experimental parameters cover the full band of the ultra-wideband regarding the FCC regulation of the ultra-wideband technology. The vector network analyzer and antennas are included in the experiment to measure and record the data. The channel transfer function evaluation results are path loss and delay characteristics. The contributions are useful for further development in the future wireless body area network applications as the basic knowledge of the human body effects.
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A novel analysis of IR-WPAN transmission using Friis' transmission formula
(2017-11-03)
Udomsom, Sittan
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Yooyativon, Thongchai
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Chaisricharoe, Roungsan
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Kamyod, Chayapol
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Promwong, Sathaporn
Impulse radio (IR) transmission is consider used in wireless personal area network (WPAN) for high speed and low power transmission and new innovation wireless technology. This paper propose a novel analysis of impulse radio transmission in WPAN for ultra wireless communications. The waveform distortion due to the antennas should be considered. The optimum and isotropic template receivers are considered based on Friis transmission formula. In this experimental study, the biconical antennas are uesd as the transmitter (Tx) and the receiver (Rx) antennas. The rectangular passband, which is satisfied the full band of UWB-IR definition and Federal Communications Commission (FCC) indoor limit spectral masks, is used as the transmitted waveform of UWB system. The channels are measured in an anechoic chamber by using a vector network analyzer (VNA). The measured data are evaluated in path loss of optimal and isotropic template receivers, the IR transmission gains and BER are shown and compared in results.
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Evaluation of antennas performance with FCC and common spectral mask for UWB localization
(2015-01-26)
Kingsakda, Vongkeo
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Satahack, Phonepaseuth
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Mingmanee, Sirapop
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Promwong, Sathaporn
Antennas which are used to transmit and receive ultra wideband impulse radio (UWB-IR) signals should be able to accomodate its large bandwidth. Moreover, the signals should not be distorted too much when they pass through the antennas. Therefore, the transfer function of antennas should be known the performance. The indoor and the outdoor localization are usually evaluated by using the extension of Friis' transmission formula. However, it is not directly application to UWB transmission systems. This paper are presentation, the characterization of UWB antennas performance that takes into account the transmission signal waveform, its distortion due to the antennas, and the receiver. Since the antennas are significant pulse-shaping filters in UWB, various kinds of antennas are experimentally examined, especially focusing on the UWB template waveform.
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Ultra wireless transmission waveform measurement with IEEE802.15.3a
(2013-12-31)
Promwong, Sathaporn
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Rankhamrat, Borromwut
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Thavonsassanavong, Thanin
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Chaiyapong, Saksit
Ultra wireless transmission waveform with IEEE802.15.3a or ultra wideband (UWB) band is expected to applied to wireless personal area networks (WPANs) such as the ranging in the home network and the office and broadband multimedia systems. Ultra wideband impulse radio (UWB-IR) transmission waveform is investigated by using extended Friis' transmission formula baseded on measurement data. This paper, we conderation the performance system design on ultra wireless system for WiMedia area networks. The received signal and isotropic template receivers are considered based on Friis transmission formula. In this experimental study, the biconical antennas are uesd as the transmitter (Tx) and the receiver (Rx) antennas. The rectangular passband, which is satisfied the full band of UWB spectrum definition and Federal Communications Commission (FCC) indoor and outdoor limit spectral masks, is used as the transmitted UWB signal. The channels are measured in an indoor environment by using a vector network analyzer (VNA). The UWB transmission gains of received signal and isotropic template receivers are shown and compared in results. © 2013 IEEE.
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Wireless ultra wideband transmission experiments
(2011-12-01)
Rankhamrat, Borromwut
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Promwong, Sathaporn
The free space transmission estimation of ultra wideband impulse radio (UWB-IR) was developed by using the extension of Friis' transmission formula [1]. It considered the transmitted waveform and its distortion due to the channel and the transmitter (Tx) and receiver (Rx) antennas for the free space link budget evaluation of UWB-IR. This paper presents the two path evaluation formula of the ground reflection path loss for UWB-IR systems that based on the extension of Friss' transmission formula. Since the antennas are the pulse-shaping filters in UWB-IR systems, the biconical antennas are experimentally examined, especially focusing the effect of template waveforms. © 2011 IEEE.
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Optimum receiver evaluation of ultra wideband impulse radio based on measurements data
(2011-12-01)
Phroasamniang, Amphon
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Promwong, Sathaporn
Ultra wideband impulse radio (UWB-IR) technology is an ideal candidate for wireless UWB that can be utilized for short-range, high-speed, low power, and low cost indoor applications. The transmission gain of the free space propagation loss is usually estimated by using Friis' transmission formula. The Friis formula, it is not directly applicable to ultra wideband impulse radio network transmission systems, in particular the single band impulse radio, as the formula is expressed as a function of the frequency. Moreover, the waveform may be distorted due to the frequency characteristics of the antenna, and the comparison between Tx and Rx waveforms is not straightforward. This paper discusses the free space link budget evaluation of UWB antenna with template receiver based on the extended Friis' transmission formula. The template is considered at the receiver side to maximize the SNR for evaluation. An experimental evaluation of the complex transfer function needs the three-antenna method for the calibration of reference antenna. The technique gives very accurate results and is very useful for design and evaluation of UWB transmission performance, especially for the evaluation of waveform distortion effects. © 2011 IEEE.
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Quantitative evaluation of wireless ultra wideband loss due to transmission gain and group delay
(2011-12-01)
Chantarawat, Chartchai
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Promwong, Sathaporn
In this paper, we evaluated the effect of transmission gain and group delay in ultra wideband transmission by using the Friis' transmission formula. However, it is not directly applicable to ultra wideband impulse radio (UWB-IR) transmission systems. This paper presents the evaluation formula in the term of transmission gain and group delay for the UWB-IR that takes into account the transmitted waveform, its distortion due to the antennas, the channel and the correlation receiver. Since the antennas are significant pulse-shaping filters in UWB impulse radio, the various kinds of the antennas are experimentally examined, especially focused on the effect of the received signal. © 2011 IEEE.
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Antenna transfer function evaluation scheme for ultra wideband medical applications
(2011-12-01)
Koonchiang, Krisada
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Manositthichai, Narongsak
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Fongsamut, Chalermpan
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Promwong, Sathaporn
Antennas which are used to transmit and receive UWB signals must be able to accomodate its large bandwidth. Moreover, the signals should not be distorted too much when they pass through the antennas. Therefore, the transfer function of antennas should be known for the performance evaluation. Conventionally, the authors measure the transfer function of the antenna by measuring the transmission coefficient between the transmit and the receive antenna, assuming that the transmit and receive antennas are identical. In this presentation, a more accurate three-antenna method is introduced so that the transfer function of each individual antenna can be measured. By using this method, biconical antennas are tested. The results show that these transfer functions are close to each other and that the antenna can be used for UWB meadical application (UWB-MA). Friis' transmission formula in complex form to treat the UWB signals to take into account the waveform distortion due to the frequency characteristics of the antennas [1], [7]. It is noted that Friis' transmission formula is applicable only in the far field region. In wireless meadical environments, however, the distance may not satisfy the far field condition. In this paper, we discusses the antenna evaluation of the transmission properties in Fresnel region. © 2011 IEEE.
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Performance evaluation scheme of ultra wideband impulse radio transmission
(2010-07-30)
Sereewattanapong, Thawatchai
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Promwong, Sathaporn
Ultra wideband transmission waveform is investigated by using extended Friis' transmission formula baseded on experiment data. This paper, we consideration the performance system design on ultra wideband impulse radio (UWB-IR) system for personal area networks. The received signal and isotropic template receivers are considered based on Friis' transmission formula. In this experimental study, the biconical antennas are uesd as the transmitter (Tx) and the receiver (Rx) antennas. The rectangular passband, which is satisfied the full band of UWB signal definition and Federal Communications Commission (FCC) indoor and outdoor limit spectral masks, is used as the transmitted UWB signal. The channels are measured in an anechoic chamber by using a vector network analyzer (VNA). The relative gains of received signal and isotropic template receivers are shown and compared in results.
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Waveform distortion and transmission gain on ultra wideband impulse radio
(2010-01-01)
Promwong, Sathaporn
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Supanakoon, Pichaya
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Takada, Jun Ichi
A waveform of an ultra wideband impulse radio (UWBIR) system can be extremely distorted through a channel even for free-space transmission because of antenna dispersion. This highly degrades the link budget performance. Therefore, the understand of antenna characteristics, which effects on waveform distortion, is necessary. This paper studies the waveform distortion due to antenna in free space transmission in UWB-IR system. The link budget is usually evaluated by using the Friis' transmission formula. However, it is not directly applicable to the UWB-IR transmission system. The link budget evaluation formula attended from conventional Friis' transmission formula that takes into account the transmitted waveform, its distortion due to the antennas, the channel and the correlation receiver is proposed. Since the antenna is significant pulse-shaping filters in UWB-IR system, the example kind of the log-periodic dipole antenna (LPDA) is experimentally examined, especially focused on the effect of the template waveforms. Copyright © 2010 The Institute of Electronics, Information and Communication Engineers.

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