Results 251 to 260 of about 4,109,115 (314)
Some of the next articles are maybe not open access.
A Countermeasure for Traffic Analysis Attacks: Covert Communications With Digital Modulation
IEEE Wireless Communications Letters, 2021In this letter, we provide a physical layer supported defense mechanism against traffic analysis attacks by exploring the covert communication capability of digital modulation schemes.
Ozan Alp Topal, G. Kurt
semanticscholar +1 more source
Optical Fiber Communications Conference and Exhibition, 2021
We propose and experimentally demonstrate a hybrid digital-analog radio-over-fiber technique based on cascaded digital PCS-121-QAM modulation and analog pulse code modulation for each radio waveform sample, achieving 12.8 dB SNR gain over A-RoF and 1.38%
Xiang Liu
semanticscholar +1 more source
We propose and experimentally demonstrate a hybrid digital-analog radio-over-fiber technique based on cascaded digital PCS-121-QAM modulation and analog pulse code modulation for each radio waveform sample, achieving 12.8 dB SNR gain over A-RoF and 1.38%
Xiang Liu
semanticscholar +1 more source
sDMCM—A Semantic Digital Modulation Constellation Mapping Scheme for Semantic Communication
IEEE Internet of Things JournalThe current state of semantic communication research is primarily based on analog modulation, whereas digital communication is more prevalent in practical applications.
Lei Teng +3 more
semanticscholar +1 more source
A Method for Digital Modulation Recognition Based on Mixed Signal Features
2019 International Conference on Electronic Engineering and Informatics (EEI), 2019Digital modulation recognition is an important part of signal processing. With inherent anti-noise performance, High-Order Cumulants have natural advantage in recognizing digital modulation pattern, and is widely studied in the past several decades.
Yangqiang Yang, Lifen Yang, Mingbo Hu
semanticscholar +1 more source
Applied Optics, 1974
Present situations of developments of digital spatial modulators are summarized and new models of the digital spatial modulators made of crystals of gadolinium molybdate are introduced. The first model is of a frame at a time mode. A principle of the design is based on the ferroelectric and ferroelastic properties of the crystal. The second model is of
openaire +2 more sources
Present situations of developments of digital spatial modulators are summarized and new models of the digital spatial modulators made of crystals of gadolinium molybdate are introduced. The first model is of a frame at a time mode. A principle of the design is based on the ferroelectric and ferroelastic properties of the crystal. The second model is of
openaire +2 more sources
IEEE Transactions on Antennas and Propagation, 2020
Metasurfaces are well-designed artificial periodic or quasiperiodic structures to achieve customized electromagnetic responses. Based on the time-domain digital coding metasurface (TDCM) with dynamic reflection or transmission characteristics, one can ...
J. Dai +8 more
semanticscholar +1 more source
Metasurfaces are well-designed artificial periodic or quasiperiodic structures to achieve customized electromagnetic responses. Based on the time-domain digital coding metasurface (TDCM) with dynamic reflection or transmission characteristics, one can ...
J. Dai +8 more
semanticscholar +1 more source
A digital modulator with bandpass delta-sigma modulator
Proceedings of the 30th European Solid-State Circuits Conference, 2004A digital quadrature modulator with a bandpass ??-modulator is presented that interpolates orthogonal input carriers by 16 and performs a digital quadrature modulation at carrier frequencies fs/4, ?fs/4 (fs is the sampling frequency). After quadrature modulation, the signal is converted into an analogue IF signal using a bandpass ??
Johan Sommarek +4 more
openaire +1 more source
Advanced Functional Materials
Multi‐dimensional modulation of electromagnetic (EM) waves is critical in various fields such as electronic and photonic systems. Space‐time‐coding (STC) digital metasurfaces, an innovative platform for programmable metasurfaces, offer a straightforward ...
Lei Zhang +6 more
semanticscholar +1 more source
Multi‐dimensional modulation of electromagnetic (EM) waves is critical in various fields such as electronic and photonic systems. Space‐time‐coding (STC) digital metasurfaces, an innovative platform for programmable metasurfaces, offer a straightforward ...
Lei Zhang +6 more
semanticscholar +1 more source
2009
This chapter contains sections titled: Baseband Pulse Transmission Amplitude-shift Keying (ASK) Binary Phase-shift Keying (BPSK) Binary Frequency-shift Keying (FSK) Quadriphase-shift Keying (QPSK) Quadrature Amplitude Modulation Orthogonal Frequency Division Multiplexing (OFDM) OFDM in Wireless Local Area ...
openaire +2 more sources
This chapter contains sections titled: Baseband Pulse Transmission Amplitude-shift Keying (ASK) Binary Phase-shift Keying (BPSK) Binary Frequency-shift Keying (FSK) Quadriphase-shift Keying (QPSK) Quadrature Amplitude Modulation Orthogonal Frequency Division Multiplexing (OFDM) OFDM in Wireless Local Area ...
openaire +2 more sources
2001
MPEG source coding, which achieves a data reduction in audio and video signals, has been discussed in chapters 3 and 4. As explained in chapter 5, the various elementary streams are combined in the MPEG transport multiplexer to form a single data stream.
openaire +2 more sources
MPEG source coding, which achieves a data reduction in audio and video signals, has been discussed in chapters 3 and 4. As explained in chapter 5, the various elementary streams are combined in the MPEG transport multiplexer to form a single data stream.
openaire +2 more sources