Results 21 to 30 of about 1,345 (198)
KNN BASED CLASSIFICATION OF DIGITAL MODULATED SIGNALS
International Islamic University Malaysia Engineering Journal, 2016 Demodulation process without the knowledge of modulation scheme requires Automatic Modulation Classification (AMC). When receiver has limited information about received signal then AMC become essential process. AMC finds important place in the field many
Sajjad Ahmed Ghauri
doaj +1 more source
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 +4 more
openaire +2 more sources
IEEE Photonics Journal, 2016 We demonstrate the codesign and cointegration of an ultracompact silicon photonic receiver and a low-power-consumption (155 mW/channel) two-channel linear transimpedance amplifier array.
J. Zhang +10 more
doaj +1 more source
OFDM With Double Quadrature Signed Index Shift Keying
IEEE Access, 2023 Spectral, and energy-efficient, communication is essential for the current and future wireless communication generations. Therefore a novel OFDM with double quadrature signed index shift keying (OFDM-DQSISK) is proposed.
Hany S. Hussein, Mohammed Farrag
doaj +1 more source
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 ...
J. Yan, L. An, Z. Zheng, X. Liu
openaire +1 more source
PERFORMANCE ANALYSIS OF MIMO-SPACE TIME BLOCK CODING WITH DIFFERENT MODULATION TECHNIQUES [PDF]
ICTACT Journal on Communication Technology, 2012 MIMO Diversity is the technique which takes the advantage of multipath and mitigates the effect of fading and increases signal strength. Space Time Block code (STBC) is used in Multiple Input Multiple Output (MIMO) system to improve the performance by ...
Shubhangi Chaudhary, A.J. Patil
doaj
IEEE Photonics Journal, 2016 We propose and experimentally demonstrate an optical modulation format converter from a 25-Gbps quadrature phase-shift keying (QPSK) signal to two 12.5-Gbps binary phase-shift keying (BPSK) signals in a double-pass configuration, which is achieved by ...
Yu-Hsiang Wen, Jia-Wei Ho, Kai-Ming Feng
doaj +1 more source
A Unified Theory of Intrachannel Nonlinearity in Pseudolinear Phase-Modulated Transmission
IEEE Photonics Journal, 2010 It is shown that the phase distribution of the field and the detection scheme strongly affect the strength of the nonlinear impairments in phase-modulated transmission systems.
A. Mecozzi
doaj +1 more source
IEEE Photonics JournalAn all-optical format conversion (AOFC) scheme for the input 30 Gbit/s rectangular 8-ary quadrature amplitude modulation (8QAM) signal is proposed and numerically investigated based on phase-sensitive amplification (PSA) and nonlinear Mach-Zehnder ...
Qiankun Li +7 more
doaj +1 more source
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.
Walsh, Anthony J. +6 more
openaire +1 more source