Results 141 to 150 of about 4,216 (180)
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BER Performance Comparison of DCO-OFDM and Convolutional Coded DCO-OFDM in IM/DD Systems
International Journal of Electronics, Communications, and Measurement Engineering, 2019Optical wireless communication (OWC) is an alternative technology to meet the demands of the exponentially-growing high data rate applications run by broadband users. The implementation of single carrier modulation techniques in OWC is an age old technology, but for the last few years research is focused towards the multicarrier modulation techniques ...
Jayasudha Koti, Braj Kishore Mishra
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A Class-D CMOS DCO with an on-chip LDO
ESSCIRC 2014 - 40th European Solid State Circuits Conference (ESSCIRC), 2014This paper presents the co-design of a class-D digitally-controlled oscillator (DCO) and a low-dropout voltage regulator (LDO) generating the supply voltage for the DCO. Despite the high intrinsic supply pushing of the class-D oscillator topology, the LDO noise has only a very marginal impact on the DCO phase noise.
Luca Fanori +2 more
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Live demonstration: 150Mbps+ DCO-OFDM VLC
2016 IEEE International Symposium on Circuits and Systems (ISCAS), 2016This demonstration showcases the potential of OFDM-based Visible Light Communication (VLC) systems for indoor high-speed communications using off-the-shelf LEDs, suitable for illumination. The physical layer was implemented in a Xilinx Virtex-6 FPGA using System Generator.
Monica Figueiredo +2 more
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2008 IEEE Custom Integrated Circuits Conference, 2008
A digitally-controlled oscillator (DCO) for mm-wave wireless applications is demonstrated for the first time. Low phase noise is achieved adopting an efficient complementary topology and optimizing the programmable-capacitor array. A fine frequency resolution of 1.8 MHz is obtained using switched metal-oxide-metal capacitors while coarse frequency ...
Raffaella Genesi +2 more
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A digitally-controlled oscillator (DCO) for mm-wave wireless applications is demonstrated for the first time. Low phase noise is achieved adopting an efficient complementary topology and optimizing the programmable-capacitor array. A fine frequency resolution of 1.8 MHz is obtained using switched metal-oxide-metal capacitors while coarse frequency ...
Raffaella Genesi +2 more
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An Optimum DC-Biasing for DCO-OFDM System
IEEE Communications Letters, 2014Selecting an appropriate direct current (dc) bias is crucial to obtain positive and low-peak-to-average-power-ratio electrical signals in the dc optical orthogonal frequency-division multiplexing (DCO-OFDM) system. In this letter, our goal is to propose an optimization strategy of dc bias under given lower and upper clipping bounds. We characterize the
Mingxuan Zhang, Zaichen Zhang
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Bend–stretch Fermi resonance in DCO+
The Journal of Chemical Physics, 2002Rydberg series, rovibrationally isolated by double resonant excitation, are extrapolated to determine rotational-state detailed ionization thresholds to form DCO+ in the bending-excited levels (030) and (040). Analysis of the rovibrational structure derived from the positions of these thresholds for (030) agrees with a simple parameterization extended ...
Jason D. Robinson +4 more
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1990
Myers and Benson (1983) conducted a survey of nearby molecular cores for NH3. They identified 27 such cores, with an average TK ~ 10 K and an average density of 104. This sample allows one to investigate physical conditions in low mass cores, with a variety of techniques.
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Myers and Benson (1983) conducted a survey of nearby molecular cores for NH3. They identified 27 such cores, with an average TK ~ 10 K and an average density of 104. This sample allows one to investigate physical conditions in low mass cores, with a variety of techniques.
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Millimeter and submillimeter spectra of HCO+ and DCO+
The Journal of Chemical Physics, 1981Millimeter and submillimeter spectra of HCO+ and DCO+ are reported. (AIP)
K. V. L. N. Sastry +2 more
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2015
Presentatie Duurzaam Coöperatief Ondernemen, gehouden op 20-10-2015.
Foorthuis, Willem, Lutz, Sabine
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Presentatie Duurzaam Coöperatief Ondernemen, gehouden op 20-10-2015.
Foorthuis, Willem, Lutz, Sabine
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A high-accuracy DCO with hybrid architecture
Journal of Semiconductors, 2017In this paper, a novel hybrid digital-controlled oscillator (DCO) is proposed, which is used to improve the accuracy of the all-digital clock generator without reference source. The DCO with hybrid architecture consists of two parts: DCO_high and DCO_low.
Yapeng Sun +4 more
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