Results 221 to 230 of about 63,008 (302)
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Multistage sigma-delta modulation
IEEE Transactions on Information Theory, 1989A theoretical basis is provided for multistage sigma-delta modulation (MSM), which is a cascade realization of several single-loop sigma-delta modulators with a linear combinatorial network. Equations are derived describing the output and the quantization noise of MSM for an arbitrary input signal, and the noise-shaping characteristic of MSM is ...
Wu Chou, Ping Wah Wong, Robert M. Gray
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65,536-QAM OFDM signal transmission over a fiber-THz system at 320 GHz with delta-sigma modulation.
Optics Letters, 2023The transmission of a 65,536-ary quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) signal supported by a hybrid fiber-terahertz (THz) multiple-input multiple-output (MIMO) system at 320 GHz is experimentally ...
Junting Shi +8 more
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2018Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO), 2018
The article deals with the problem of increasing the efficiency of EER transmitters. The results of computer simulation of the EER power amplifier using transistors made by common MOSFET and advanced GaN technology in the form of graphs: the dependence ...
A. O. Bolotov +2 more
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The article deals with the problem of increasing the efficiency of EER transmitters. The results of computer simulation of the EER power amplifier using transistors made by common MOSFET and advanced GaN technology in the form of graphs: the dependence ...
A. O. Bolotov +2 more
semanticscholar +1 more source
4096-QAM OFDM THz-Over-Fiber MIMO Transmission Using Delta-Sigma Modulation
IEEE Photonics Technology Letters, 2023A terahertz (THz)-over-fiber multiple-input multiple-output (MIMO) transmission of 4096-ary quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) supported by 46-GBaud quadrature phase shift keying (QPSK) signal at 320 ...
Junting Shi +7 more
semanticscholar +1 more source
Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03., 2003
/spl Sigma//spl Delta/ modulators for portable applications are presented operating within a large range of supply voltages. A 2/sup nd/ order and a cascaded 3rd order modulator are designed in Switched-Opamp (SO) technique with common mode level shift.
Jens Sauerbrey +3 more
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/spl Sigma//spl Delta/ modulators for portable applications are presented operating within a large range of supply voltages. A 2/sup nd/ order and a cascaded 3rd order modulator are designed in Switched-Opamp (SO) technique with common mode level shift.
Jens Sauerbrey +3 more
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IEEE Transactions on Communications, 1992
A modulo sigma-delta modulator is introduced, and the behavior of the quantization error is derived. The system consists of a modulo limiter followed by a sigma-delta modulator. The limiter confines the input to the no-overload region of the sigma-delta modulator, and the modulo arithmetic performed by the limiter is amenable to recently developed ...
Wu Chou, Robert M. Gray
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A modulo sigma-delta modulator is introduced, and the behavior of the quantization error is derived. The system consists of a modulo limiter followed by a sigma-delta modulator. The limiter confines the input to the no-overload region of the sigma-delta modulator, and the modulo arithmetic performed by the limiter is amenable to recently developed ...
Wu Chou, Robert M. Gray
openaire +2 more sources
IEEE Transactions on Biomedical Circuits and Systems, 2018
Fluorescence biophotometry measurements require wide dynamic range (DR) and high-sensitivity laboratory apparatus. Indeed, it is often very challenging to accurately resolve the small fluorescence variations in presence of noise and high-background ...
M. N. Khiarak +6 more
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Fluorescence biophotometry measurements require wide dynamic range (DR) and high-sensitivity laboratory apparatus. Indeed, it is often very challenging to accurately resolve the small fluorescence variations in presence of noise and high-background ...
M. N. Khiarak +6 more
semanticscholar +1 more source
SNR-enhanced signal delivery scheme with delta-sigma modulation in a four-mode fiber system.
Optics Letters, 2023This Letter proposes a scheme for optimizing the signal-to-noise ratio (SNR) of signal to improve the system performance by a 1 bit delta-sigma modulation (DSM) in a four-mode MDM system for mobile fronthaul.
Jianyu Long +12 more
semanticscholar +1 more source
Optics Letters, 2023
We propose a photonic-aided dual-vector radio-frequency (RF) signal generation and detection scheme enabled by bandpass delta-sigma modulation and heterodyne detection.
Xinying Li +13 more
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We propose a photonic-aided dual-vector radio-frequency (RF) signal generation and detection scheme enabled by bandpass delta-sigma modulation and heterodyne detection.
Xinying Li +13 more
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W-band RoF polarization multiplexing system supports 1048576 QAM with delta-sigma modulation.
Optics Letters, 2023We propose and experimentally verify a photonics-aided W-band millimeter wave (MMW) radio-over-fiber (RoF) polarization-multiplexed envelope detection system for high-order quadrature amplitude modulation (QAM) signals.
Jiaxuan Liu +11 more
semanticscholar +1 more source