Temat: ultra wideband - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A New CPW-fed Patch Antenna for UWB Applications
Autorzy:: Sharma, P.
Jha, S. K.
Bhattacharya, P. P.
Powiązania:: https://bibliotekanauki.pl/articles/308292.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: planar antenna
ultra wideband
wireless communication
Opis:: In this paper, the design and analysis of a compact size coplanar waveguide (CPW)-fed antenna for ultrawideband (UWB) applications is presented. The antenna has a compact size of 20×20×1.1 .5 .mm and provides a good impedance matching over the entire bandwidth of 3.2–14.3 GHz. The characteristics parameters, i.e. return loss, VSWR and radiation pattern, are analyzed using HFSS 11.0 software.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 2; 75-78
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:: On the Effects of Code Cardinality for TH-PPM Ultra Wideband Systems
Autorzy:: Mahfuz, M. U.
Ahmed, K. M.
Rajatheva, N.
Powiązania:: https://bibliotekanauki.pl/articles/307946.pdf
Data publikacji:: 2008
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: code cardinality
multiple user interference
TH-PPM
ultra wideband
Opis:: This paper demonstrates the effects of code cardinality at transmitter section on bit error rate (BER) performance of time hopping pulse position modulation (TH-PPM) based ultra wideband (UWB) indoor radio communication. In the transmitter, different code cardinality values have been chosen and correspondingly the effects on BER of the system have been investigated. The recently accepted IEEE 802.15.3a model of the UWB channel has been used as the propaga- tion channel model in indoor environment. Results show that the system BER performance is significantly dependent on the code cardinality value of time hopping code. For such higher code cardinality values as in the range from 30 to 50, the BER performance degrades severely. Finally, code cardinality in the range from 10 to 15 has been recommended for TH-PPM system in UWB indoor communications providing better BER performance for the same system data rate requirement
Źródło:: Journal of Telecommunications and Information Technology; 2008, 4; 73-78
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:: Optimum receiver performance of TH-PPM ultra wideband system in multiple user interference
Autorzy:: Mahfuz, M. U.
Ahmed, K. M.
Rajatheva, N.
Powiązania:: https://bibliotekanauki.pl/articles/308545.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: optimum receiver performance
TH-PPM
ultra wideband
multiple user interference
Opis:: This paper demonstrates optimum receiver performance in terms of bit error rate (BER) for time hopping pulse position modulation (TH-PPM) ultra wideband (UWB) system in multiple user interference environment for indoor radio communication. Equal gain combining and selective gain combining have been demonstrated in terms of ideal RAKE (ARAKE), selective RAKE (SRAKE) and partial RAKE (PRAKE) receiver performances. The recently accepted IEEE 802.15.3a model of the UWB channel has been used to describe UWB propagation in indoor environment. Two channel scenarios named CM-1 and CM-3 for IEEE 802.15.3a channel model have been investigated principally. Finally, this paper concludes with an approximation of equivalence of number of fingers in SRAKE and PRAKE receivers as well as an indication of SNR gains achievable as the RAKE finger number is increased, espe- cially with multiple user interference (MUI), for a 16.6 Mbit/s UWB system.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 4; 77-84
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:: Digitally programmable delay-locked-loop with variable charge pump current
Autorzy:: Lopes, B.
Paulino, N.
Goes, J.
Steiger-Garçăo, A.
Powiązania:: https://bibliotekanauki.pl/articles/397829.pdf
Data publikacji:: 2010
Wydawca:: Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:: opóźnienie locked-loop
cyfrowo programowalne opóźnienie
ultra szerokie pasmo
delay-locked loop
digitally programmable delay
ultra wideband
Opis:: This paper presents a digitally programmable delay line intended for use as timing generator in a RADAR ranging system. The architecture of the programmable delay uses a ΣΔ modulator to generate a reference clock with a delay unaffected by component matching. This reference clock has a large jitter noise component that is filtered by delay lock loop (DLL). The programmable delay can produce a delay ranging from 20 ns to 100 ns, because of the large delay variation, it is necessary to use a variable charge pump current in the DDL, in order to guaranty stability for all the desired delay values. The electrical design of the circuit, in a 0.13-/žm 1.2-V CMOS technology, will be presented, as well as electrical simulations results of the complete system.
Źródło:: International Journal of Microelectronics and Computer Science; 2010, 1, 3; 269-276
2080-8755
2353-9607
Pojawia się w:: International Journal of Microelectronics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Ultra-wide-angle Wireless Endoscope with a Backend-camera-controller Architecture
Autorzy:: Shim, D.
Yi, J.
Powiązania:: https://bibliotekanauki.pl/articles/226144.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: wireless endoscope
ultra wide-angle
plastic lens
backend camera controller
serial image sensor
ultra wideband
Wi-Fi
latency
Opis:: This paper presents a wireless endoscope with an ultra-wide FOV (Field of View) of 130° and HD resolution (1280x720 pixels). The proposed endoscope consists of a camera head, cable, camera controller, and wireless handle. The lens module with a 150° degrees AOV (Angle of View) is achieved using the plastic injection-molding process to reduce manufacturing costs. A serial CMOS image sensor using the MIPI (Mobile Industry Processor Interface) CSI-2 (Camera Serial Interface-2) interface physically separates the camera processor from the camera head. The camera head and the cable have a compact structure due to the BCC (Backend-Camera-Controller) architecture. The size of the camera head and the camera controller is 8x8x26 mm and 7x55 mm, respectively. The wireless handle supports a UWB (Ultra-Wide-Band) or a Wi-Fi communication to transmit video data. The UWB link supports a maximum data transfer rate of ~37 Mbps to transmit video data with a resolution of 1280x720 pixels at a frame rate of 30 fps in the MJPEG (Motion JPEG) format. Although the Wi-Fi link provides a lower data transfer rate (~8 Mbps Max.), it has the advantage of flexible interoperability with various mobile devices. The latency of the UWB link is measured to be ~0.1 sec. The Wi-Fi link has a larger latency (~0.5 sec) due to its lower data transfer rate. The proposed endoscope demonstrates the feasibility of a high-performance yet low-cost wireless endoscope using the BCC architecture. To the best of the author’s knowledge, the proposed endoscope has the largest FOV among all presently existing wireless endoscopes.
Źródło:: International Journal of Electronics and Telecommunications; 2017, 63, 1; 19-24
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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