Results 101 to 110 of about 1,385 (151)

Heterogeneously integrated lithium tantalate-on-silicon nitride modulators for high-speed communications. [PDF]

Nat Commun
Cai J, Kotz A, Larocque H, Wang C, Ji X, Zhang J, Drayss D, Sun J, Zheng S, Ou X, Koos C, Kippenberg TJ.   +11 more
europepmc   +1 more source

Advanced Modulation Formats for 400 Gbps Optical Networks and AI-Based Format Recognition. [PDF]

Sensors (Basel)
He Z, Huang H, Hu F, Gong J, Shi B, Guo J, Peng X.   +6 more
europepmc   +1 more source

Multiuser wireless network enhancement via an innovative rime optimization search strategy. [PDF]

PLoS One
Alsaggaf W, Gafar M, Sarhan S, Shaheen AM, Alwakeel AS.   +4 more
europepmc   +1 more source

Achievable rate analysis of orbital angular momentum multiplexing and demultiplexing using E-band metasurfaces. [PDF]

Sci Rep
Chung H, Kim B, Lee YS, Choi H, Jung BC, Choi E, Lee J.   +6 more
europepmc   +1 more source

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Quadrature-quadrature phase-shift keying

IEEE Transactions on Communications, 1989
Quadrature-quadrature phase-shift keying (Q/sup 2/PSK) is a spectrally efficient modulation scheme which utilizes available signal space dimensions in a more efficient way than two-dimensional schemes such as QPSK and MSK (minimum-shift keying). It uses two date shaping pulses and two carriers, which are pairwise quadrature in phase, to create a four ...
Debabrata Saha, Theodore G. Birdsall
exaly   +6 more sources

Experimental demonstration of microring quadrature phase-shift keying modulators

Optics Letters, 2012
Advanced optical modulation formats are a key technology to increase the capacity of optical communication networks. Mach-Zehnder modulators are typically used to generate various modulation formats. Here, we report the first experimental demonstration of quadrature phase-shift keying (QPSK) modulation using compact microring modulators.
Nicolas Fontaine, Chongjin Xie, Po Dong   +2 more
exaly   +3 more sources

Trellis Coded Quadrature-Quadrature Phase Shift Keying

MILCOM 1987 - IEEE Military Communications Conference - Crisis Communications: The Promise and Reality, 1987
Integrated modulation and coding due to Ungerboeck observed no significant effect of dimensionality of signal space on the coding gain; it appeared unlikely that signals in more than two dimensions could have advantages. In this paper, it is pointed out that the utilization of all available signal space dimensions may bring further improvement in the ...
Fei Wang, Jian Liu, Shuai Wang
  +4 more sources

Synchronization of quadrature-quadrature phase-shift keying signals

IEEE Transactions on Communications, 1992
The key synchronization aspects in the system design of a QQPSK (quadrature-quadrature phase-shift-keying) modem are addressed. The sensitivity of the data demodulator to synchronization errors is discussed, and contextually the performances of some IF and baseband carrier phase and symbol timing recovery schemes are evaluated both theoretically and by
Riccardo De Gaudenzi, Marco Luise
openaire   +2 more sources

Continuous phase quadrature phase shift keyed signaling technique with coding

IEEE Journal on Selected Areas in Communications, 1989
A continuous phase quadrature phase shift keyed (CPQPSK) modulation technique is presented. This method utilizes a conventional QPSK modulator and a phase trajectory converter to approximate M=4, h=1/4 continuous phase signal and allows low cost, low complexity, and high rate (>1 Gbit/s) CPM modem implementation for bandwidth efficient transmission ...
Steve S. Kuh, Tyrone A. Strozier, Carl R. Ryan   +2 more
openaire   +1 more source