Study of a novel high-speed all-optical orthogonal modulation scheme based on frequency-shift keying and intensity-modulated labeling

2008 ◽  
Vol 47 (9) ◽  
pp. 095002
Author(s):  
Minghao Li
Keyword(s):  
Frequency Shift ◽  
High Speed ◽  
Modulation Scheme ◽  
Frequency Shift Keying ◽  
Intensity Modulated ◽  
All Optical ◽  
Shift Keying ◽  
Orthogonal Modulation

An ultraviolet laser communication system using frequency-shift keying modulation scheme

2015 ◽  
Vol 11 (1) ◽  
pp. 65-68 ◽  
Author(s):  
Di-yong Peng ◽  
Jun Shi ◽  
Guang-hui Peng ◽  
Sha-li Xiao ◽  
Shan-he Xu ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Communication System ◽  
Laser Communication ◽  
Modulation Scheme ◽  
Frequency Shift Keying ◽  
Ultraviolet Laser ◽  
Shift Keying

ROF systems performance efficiency based on continuous phase frequency shift keying phase modulation scheme

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahmoud M. A. Eid ◽  
Vishal Sorathiya ◽  
Sunil Lavadiya ◽  
Ismail A. Abd El-Aziz ◽  
Sayed Asaduzzaman ◽  
...  
Keyword(s):  
Communication Network ◽  
Frequency Shift ◽  
Optical Communication ◽  
Phase Modulation ◽  
Noise Figure ◽  
Continuous Phase ◽  
Optical Channel ◽  
Modulation Scheme ◽  
Frequency Shift Keying ◽  
Shift Keying

Abstract Radio over fiber (ROF) technique has been presented with hybrid ordinary modulation technology to achieve improvement in optical communication network performance. Fiber Bragg grating (FBG) is employed in single mode (SM) optical channel in order to enhance the transmission environment with dispersion compensation. The continuous phase frequency shift keying phase modulation (CPFSKPM) technique is included in this study. Both previous and proposed models have been inspected and investigated. Min. bit error rate (BER), max. Q factor, signal/noise ratio (SNR), received power (RP), and noise figure (NF) are the most essential parameters able to explain the behavior performance of optical communication network model.

A New CPFSK Demodulation Approach for Software Defined Radio

2019 ◽  
Vol 28 (14) ◽  
pp. 1950243
Author(s):  
Kayol Soares Mayer ◽  
Candice Müller ◽  
Fernando Cesar Comparsi de Castro ◽  
Maria Cristina Felippetto de Castro
Keyword(s):  
Frequency Shift ◽  
Software Defined Radio ◽  
High Speed ◽  
Carrier Frequency Offset ◽  
Continuous Phase ◽  
Phase Detector ◽  
Approximation Formula ◽  
Frequency Shift Keying ◽  
Loop Filter ◽  
Shift Keying

This paper proposes a new coherent Frequency-Shift Keying (FSK) demodulation technique for software defined radio platform, based on a new Digital Phase Locked Loop (DPLL) architecture. The proposed DPLL addresses the frequency dependence on classic DPLL architectures found in the literature. In classical approaches, the loop filter constants are dependent on the frequency level of the FSK transmitted symbols. The proposed approach applies a simpler feedback loop, with a single integrator and a phase detector architecture based on the small-angle approximation [Formula: see text], which resulted in a DPLL totally independent of frequency. The proposed demodulator has been implemented in Very High Speed Integrated Circuits (VHSIC) Hardware Description Language (VHDL) and evaluated for continuous-phase frequency shift keying (CPFSK) and Gaussian minimum shift keying (GMSK) signals. For CPFSK signals, the demodulator has been evaluated for 2, 4 and 8 frequency levels, with modulation indexes [Formula: see text], [Formula: see text] and [Formula: see text], respectively. For evaluation of GMSK signals, several Gaussian filter bandwidths were considered. In addition, a brief analysis for 2-CPFSK and GMSK is presented over multipath and carrier frequency offset. Results show that the proposed method presents a significantly reduced bit error rate when compared to other coherent methods presented in the literature.

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