Results 151 to 160 of about 1,422 (198)
Achievable rate analysis of orbital angular momentum multiplexing and demultiplexing using E-band metasurfaces. [PDF]
Sci RepChung H +6 more
europepmc +1 more source
Some of the next articles are maybe not open access.
Related searches:
Related searches:
Quadrature-quadrature phase-shift keying
IEEE Transactions on Communications, 1989Quadrature-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
Trellis Coded Quadrature-Quadrature Phase Shift Keying
MILCOM 1987 - IEEE Military Communications Conference - Crisis Communications: The Promise and Reality, 1987Integrated 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
openaire +2 more sources
IET Optoelectronics, 2009 The performance of a scheme for all-optical regeneration of differential quadrature phase-shift keying (DQPSK) and quadrature phase-shift keying signals using phase-sensitive amplifiers (PSAs) is investigated through numerical simulation. The results show that both phase and amplitude noises of 40 Gb/s RZ-DQPSK signals are significantly suppressed ...
Zheng Zheng, Libao An
exaly +2 more sources
50-Gb/s silicon quadrature phase-shift keying modulator
Optics Express, 2012 We report the first successful demonstration of quadrature phase-shift keying (QPSK) modulation using two nested silicon Mach-Zehnder modulators. 50-Gb/s QPSK signal is generated with only 2.7-dB optical signal-to-noise ratio penalties from the theoretical limit at a bit-error ratio of 10(-3).
Po Dong, Chongjin Xie, Lawrence L Buhl
exaly +3 more sources
Experimental demonstration of microring quadrature phase-shift keying modulators
Optics Letters, 2012Advanced 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.
Po Dong +2 more
exaly +3 more sources
Synchronization of quadrature-quadrature phase-shift keying signals
IEEE Transactions on Communications, 1992The 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
Demonstrating Doubly-Differential Quadrature Phase Shift Keying in the Optical Domain [PDF]
IEEE Photonics Technology Letters, 2013 We report for the first time the experimental demonstration of doubly differential quadrature phase shift keying (DDQPSK) using optical coherent detection. This method is more robust against high frequency offsets (FO) than conventional single differential quadrature phase shift keying (SDQPSK) with offset compensation.
Haymen Shams +2 more
exaly +2 more sources
Continuous phase quadrature phase shift keyed signaling technique with coding
IEEE Journal on Selected Areas in Communications, 1989A 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 +2 more
openaire +1 more source