Institution
University of Electro-Communications
Education•Tokyo, Japan•
About: University of Electro-Communications is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Laser & Robot. The organization has 8041 authors who have published 16950 publications receiving 235832 citations. The organization is also known as: UEC & Denki-Tsūshin Daigaku.
Topics: Laser, Robot, Fiber laser, Mobile robot, Control theory
Papers published on a yearly basis
Papers
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TL;DR: A novel technique, which allows the use of low-speed ADCs by introducing spectral extrapolation to the band-limited feedback signal, is proposed and allows efficient implementation of DPD for very wideband signals.
Abstract: With the ever increasing demands for higher data rate, wider bandwidth is required for improving the throughput. This trend, however, imposes design challenges for the digital predistortion (DPD) in many aspects. In order to sample the broadband power amplifier (PA) output signal, it requires the use of high-speed analog-to-digital converters (ADCs), which tend to be the most expensive components in a transmitter with DPD. The sampling speed of the ADC for conventional DPD has to be several times of the original signal bandwidth in order to cover the out-of-band intermodulation components caused by nonlinear PA. In this paper, a novel technique, which allows the use of low-speed ADCs by introducing spectral extrapolation to the band-limited feedback signal, is proposed. This allows efficient implementation of DPD for very wideband signals. Experimental results demonstrate that the bandwidth of the acquisition path can be even less than the bandwidth of original signal applying the proposed technique. In addition, satisfactory linearization performance has been achieved employing wideband signals up to 160 MHz bandwidth.
78 citations
TL;DR: At high momenta the spectra show angular structure (diffraction) which is very target dependent and in good agreement with calculated differential cross sections for the scattering of free electrons from the corresponding ionic cores.
Abstract: We have measured full momentum images of electrons rescattered from Xe, Kr, and Ar following the liberation of the electrons from these atoms by short, intense laser pulses. At high momenta the spectra show angular structure (diffraction) which is very target dependent and in good agreement with calculated differential cross sections for the scattering of free electrons from the corresponding ionic cores.
78 citations
TL;DR: It is shown that for any k-vertex-connected line digraph L(G), there are k completely independent spanning trees in the underlying graph of L(g), and the results are applied to de Bruijn graphs, Kautz graphs, and wrapped butterflies.
78 citations
TL;DR: In this paper, the authors reported that a density of diamond nuclei as high as 10 10 cm −2 was attained on a mirror-polished silicon surface by pretreating the substrate surface in a hydrogen plasma containing a high concentration of methane and applying a negative bias.
78 citations
TL;DR: Continuous-wave output at 1319 nm was obtained from a laser-diode-pumped 1% ceramic Nd:YAG laser with optical-to-optical conversion efficiency of 12.5%.
Abstract: Continuous-wave output at 1319 nm was obtained from a laser-diode-pumped 1% ceramic Nd:YAG laser. As much as 36.3-W output was obtained under pump power of 290 W, with an optical-to-optical conversion efficiency of 12.5%.
78 citations
Authors
Showing all 8079 results
| Name | H-index | Papers | Citations |
|---|---|---|---|
| Mildred S. Dresselhaus | 136 | 762 | 112525 |
| Matthew Nguyen | 131 | 1291 | 84346 |
| Juan Bisquert | 107 | 450 | 46267 |
| Dapeng Yu | 94 | 745 | 33613 |
| Riichiro Saito | 91 | 502 | 48869 |
| Shun-ichi Amari | 90 | 495 | 40383 |
| Shigeru Nagase | 76 | 617 | 22099 |
| Ingrid Verbauwhede | 72 | 575 | 21110 |
| Satoshi Hasegawa | 69 | 708 | 22153 |
| Yu Qiao | 69 | 484 | 29922 |
| Yukio Tanaka | 68 | 744 | 19942 |
| Zhijun Li | 68 | 614 | 14518 |
| Iván Mora-Seró | 67 | 235 | 23229 |
| Kazuo Tanaka | 63 | 535 | 27559 |
| Da Xing | 63 | 624 | 14766 |