Combined pulse-modulation scheme for feedback systems

1969 ◽  
Vol 5 (18) ◽  
pp. 436 ◽  
Author(s):  
M.A. Pai ◽  
M.S. Varadarajan
Keyword(s):  
Modulation Scheme ◽  
Feedback Systems ◽  
Pulse Modulation

scholarly journals Static Ice Pressure Measuring System Based on Fiber Loop Ring-Down Spectroscopy and FPGA

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5927
Author(s):  
Xiao Deng ◽  
Dingrui Wang ◽  
Lipeng Pan ◽  
Li Zhang ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Optical Fiber Sensor ◽  
Temperature Stability ◽  
Field Application ◽  
Measuring System ◽  
Modulation Scheme ◽  
In Situ Observation ◽  
Pulse Modulation ◽  
Loop Ring ◽  
Ice Pressure ◽  
Fiber Loop

Hydraulic engineering built in the cold region, such as reservoirs and hydropower stations, is often threatened by static ice pressure from nature. Therefore, it is of vital significance to research the pressure variation in the growth and melting processes of the ice layer for the design and protection of hydraulic structures in cold regions. This paper introduces an optical fiber sensor system based on the fiber loop ring-down spectroscopy technology and field-programmable gate array (FPGA) pulse modulation technology. An electro-optic modulation scheme that relied on FPGA to generate optical pulses with adjustable pulse width and period is proposed, which is more suitable for the in-situ observation. In addition, the temperature stability and repeatability of the system are also discussed. This system was applied to the real-time detection of static ice pressure on the sidewall and bottom of the polyvinyl chloride (PVC) pipe during the ice growth and melting processes. The results indicate that the system has favorable stability and sensitivity, and the relationship obtained between the static ice pressure and temperature could provide some references for the field application in the future.

Analysis of feedback systems with combined pulse modulation†

1971 ◽  
Vol 14 (3) ◽  
pp. 465-475 ◽  
Author(s):  
M. S. VARADARAJAN ◽  
M. A. PAI
Keyword(s):  
Feedback Systems ◽  
Pulse Modulation

scholarly journals Underwater laser communication with sloped pulse modulation in turbid water

2019 ◽  
Vol 15 (3) ◽  
pp. 155014771983787 ◽  
Author(s):  
Taewoong Kang ◽  
Kiman Kim ◽  
Serim Kim ◽  
Donghun Lee
Keyword(s):  
Forward Error Correction ◽  
Transmission Rate ◽  
Water Channel ◽  
Blue Laser ◽  
Laser Communication ◽  
Modulation Scheme ◽  
Communication Link ◽  
Turbid Water ◽  
Pulse Modulation ◽  
Band Limited

In this article, we propose the demonstration of an underwater wireless laser communication link operating at data rates of up to 100 Mbps over a band-limited turbid water channel using a modified pulse position modulation scheme with a sloped pulse. The communication link uses an avalanche photodiode module as the receiver. The bit error rate of a 5.4 × 10−6 by 450-nm blue laser diode in turbid water with 1.4 Nephelometric Turbidity Unit was below the forward error correction limit. Our demonstrated underwater wireless laser communication system is simple to use and maintains a high data transmission rate.

Performance Analysis of New Hybrid Pulse Modulation Scheme in Optical Wireless System

2015 ◽  
Vol 35 (7) ◽  
pp. 0706004
Author(s):  
刘宏展 Liu Hongzhan ◽  
廖仁波 Liao Renbo ◽  
孙建锋 Sun Jianfeng ◽  
刘立人 Liu Liren
Keyword(s):  
Performance Analysis ◽  
Modulation Scheme ◽  
Optical Wireless ◽  
Pulse Modulation ◽  
Wireless System

scholarly journals Analysis of the dynamic behavior and short-pulse modulation scheme for laterally coupled diode lasers

2001 ◽  
Vol 7 (2) ◽  
pp. 192-200 ◽  
Author(s):  
H. Lamela ◽  
M. Leones ◽  
G. Carpintero ◽  
C. Simmendinger ◽  
O. Hess
Keyword(s):  
Dynamic Behavior ◽  
Short Pulse ◽  
Diode Lasers ◽  
Modulation Scheme ◽  
Pulse Modulation
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