Results 1 to 10 of about 1,385 (151)
Single-photon frequency shifting with a quadrature phase-shift keying modulator [PDF]
Scientific Reports, 2021 Deterministic frequency manipulation of single photons is an essential tool for quantum communications and quantum networks. We demonstrate a 15.65 GHz frequency shift for classical and nonclassical light using a commercially available quadrature phase ...
Changchen Chen +3 more
doaj +5 more sources
A Novel Sample Based Quadrature Phase Shift Keying Demodulator [PDF]
The Scientific World Journal, 2014 This paper presents a new practical QPSK receiver that uses digitized samples of incoming QPSK analog signal to determine the phase of the QPSK symbol.
Asraf Mohamed Moubark +1 more
doaj +5 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
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).
Chongjin Xie +2 more
exaly +3 more sources
Performance analysis and optimization of modulation techniques for underwater optical wireless communication in varied aquatic environments [PDF]
Scientific ReportsUnderwater Optical Wireless Communication (UOWC) has emerged as a promising technology for enabling high-speed and low-latency data transmission in aquatic environments.
M. Mokhtar Zayed, Mona Shokair
doaj +2 more sources
Capacity of a communication channel with quadrature phase-shift keying and phase quantization
Учёные записки Казанского университета: Серия Физико-математические наукиThe influence of the number of phase quantization levels L on the capacity CM,L of a communication channel with additive white Gaussian noise (AWGN) was studied in a communication system using QPSK (4-PSK).
Yu. A. Brychkov, N. V. Savischenko
doaj +2 more sources
Computers, 2022 This study proposed a two-stage method, which combines a convolutional neural network (CNN) with the continuous wavelet transform (CWT) for multiclass modulation classification. The modulation signals’ time-frequency information was first extracted using
Ahmed Mohammed Abdulkarem +8 more
doaj +1 more source
Performance Analysis of Hybrid Phase Shift Keying over Generalized Nakagami Fading Channels
Journal of Telecommunications and Information Technology, 2023 In addition to the benefits of hybrid phase shift keying (HPSK) modulation in reducing the peak to average power ratio of the transmitted signal to reduce the zero cross- ings and the 0◦-degree phase transmissions, HPSK enhances the bit error rate (BER)
Mahmoud Youssuf , Mohamed Z. Abdelmageed
doaj +3 more sources
A Novel 32-Point Modulation Scheme of 6PolSK-QPSK Signal
IEEE Access, 2023 The six-polarization shift keying quadrature (6PolSK-QPSK) has been proved to be an alternative to four-dimensional (4D) modulation scheme. A variety of transmission compensation schemes have been developed for 24-Point 6PolSK-QPSK combining the ...
Yupeng Li +7 more
doaj +1 more source
Security of the differential-quadrature-phase-shift quantum key distribution [PDF]
Physical Review A, 2016 Citation of the Fig.1 in the text ...
Kawakami, Shun +2 more
+5 more sources