Temat: wireless power - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wearable biosensing: signal processing and communication architectures issues
Autorzy:: Celka, P.
Vetter, R.
Renevey, P.
Verjus, C.
Neuman, V.
Luprano, J.
Decotignie, J. D.
Piguet, C.
Powiązania:: https://bibliotekanauki.pl/articles/309491.pdf
Data publikacji:: 2005
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: wearable sensors
wireless BAN
biosignal processing
low-power DSP
Opis:: Long-term monitoring of human vital signs is becoming one of the most important fields of research of biomedical engineering. In order to achieve weeks to months of monitoring, new strategies for sensing, conditioning, processing and communication have to be developed. Several strategies are emerging and show different possible architectures. This paper essentially focuses on issues in wearable biosignal processing and communication architecture currently running at the Swiss Center for Electronics and Microtechnology (CSEM) in the framework of several European projects.
Źródło:: Journal of Telecommunications and Information Technology; 2005, 4; 90-104
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Efficient Performance and Lower Complexity of Error Control Schemes for WPAN Bluetooth Networks
Autorzy:: El-Bendary, M. A. M.
El-Tokhy, M. A. R.
Powiązania:: https://bibliotekanauki.pl/articles/308324.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: Bluetooth
EDR
packet loss
power efficiency
Wireless Personal Area Network
Opis:: This paper presents a new technique of reduction retransmission time by decreasing the discarded packets and combating the complexity through error control techniques. The work is based on Bluetooth, one of the most common Wireless Personal Area Network. Its early versions employ an expurgated Hamming code for error correction. In this paper, a new packet format using different error correction coding scheme and new formats for the EDR Bluetooth packets are presented. A study for the Packet Error Probability of classic and Enhanced Data Rate (EDR) packets is also presented to indicate the performance. The simulation experiments are performed over Additive White Gaussian Noise (AWGN) and Rayleigh flat-fading channels. The experimental results reveal that the proposed coding scheme for EDR packets enhances the power efficiency of the Bluetooth system and reduce the losses of EDR packets.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 4; 100-107
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Laser Beam Attenuation Determined by the Method of Available Optical Power in Turbulent Atmosphere
Autorzy:: Dordov´a, L.
Wilfert, O.
Powiązania:: https://bibliotekanauki.pl/articles/308884.pdf
Data publikacji:: 2009
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: method of available power
optical wireless link
Rytov approximation
turbulent atmosphere
Opis:: This work is focused on the atmospheric turbulence effect and a new method for determining optical signal attenuation caused by turbulence is presented here. A new method of power budget of optical links comes from optical intensity distribution in a laser beam after the beam passed through turbulent atmosphere. Results given by this method are compared with Rytov approximation which is nowadays the most frequently used method for determining turbulent attenuation. Results for communication wavelength of 850 nm and 1550 nm are presented as well as the results for a wavelength of 633 nm.
Źródło:: Journal of Telecommunications and Information Technology; 2009, 2; 53-57
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Jamming Signal Cancellation by Channel Inversion Power Control for Preserving Covert Communications
Autorzy:: Hai, Ngo Thanh
Khoa, Dang Le
Powiązania:: https://bibliotekanauki.pl/articles/24200738.pdf
Data publikacji:: 2023
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: channel inversion power control
covert wireless communication
eﬀective transmission rate
uninformed jammer
Opis:: Uninformed jammers are used to facilitate covert communications between a transmitter and an intended receiver under the surveillance of a warden. In reality, the signals the uniformed jammer emits to make the warden’s decision uncertain have inadvertently interfered with the detection of the intended receiver. In this paper, we apply truncated channel inversion power control (TCIPC) to both the transmitter and the uninformed jammer. The TCIPC scheme used on the uninformed jammer may help the intended receiver remove jamming signals using the successive interference cancellation (SIC) technique. Under the assumption that the warden knows the channel coeﬃcient between two intended transceivers and achieves the optimal detection power threshold, we form the optimization problem to maximize the eﬀective transmission rate (ETR) under covertness and decoding constraints. With the aim of enhancing covertness-related performance, we achieve the optimal power control parameters and determine system parameter-related constraints required for the existence of these solutions. According to the simulations, the use of the TCIPC scheme on the uninformed jammer signiﬁcantly improves covertness-related performance in comparison to that of random power control (RPC) and constant power control (CPC) schemes. In addition, simulation results show that, for the TCIPC scheme: 1) the maximum ETR tends to converge as the transmitter’s or the uninformed jammer’s maximum transmit power increases, and 2) there exists an optimal value of the transmitter’s predetermined transmission rate to achieve the optimal performance.
Źródło:: Journal of Telecommunications and Information Technology; 2023, 2; 22--34
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Energy Consumption in Wireless Systems Equipped with RES, UAVs, and IRSs
Autorzy:: Samorzewski, Adam
Powiązania:: https://bibliotekanauki.pl/articles/24200740.pdf
Data publikacji:: 2023
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: 6G
intelligent reconﬁgurable surfaces
power consumption
renewable energy sources
unmanned aerial vehicles
wireless systems
Opis:: This paper investigates energy budget characteristics of mobile base stations (BSs) having the form of unmanned aerial vehicles (UAVs) equipped with radio frequency (RF) transceivers, intelligent reconﬁgurable surfaces (IRSs), and renewable energy sources (RES). The results obtained highlight the beneﬁts and challenges related to using the aforementioned mobile BS, from the energy-related point of view. The speciﬁc cases researched involved two types of UAV devices, i.e. multirotor and ﬁxed-wing (airplane-like) aircraft.
Źródło:: Journal of Telecommunications and Information Technology; 2023, 2; 35--40
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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