Design and Simulation of QPSK Modulator for Optic Inter Satellite Communication
Analysis of
Design and Simulation of QPSK Modulator for Optic Inter Satellite Communication:Review
Submitted by
A Penchala Bindushree
4th Sem, M.Tech (DCE)
Acharya Institute of Technology
Bangalore – 560090
Under the guidance of
Internal Guide:
Nataraju A B M.tech, (PhD)
Assistant Professor, ECE Department
Acharya Institute of Technology
Bangalore – 560090
External Guide:
Vijesh T V
Scientist/Engineer ‘SC’
LEOS/ISRO
Bangalore-560013
Abstract
We have proposed a digitally implemented QPSK system for Free-Space Optics systems for future satellite missions. We have used a Laser source of 1550nm wavelength and data rate of 2.5Gbps.The system consists of a modulating and a demodulating block and an advantage of filters added to improve the performance and optimize errors like noise.
The best suited modulator for FSO is Mach-Zehnder modulator which is tuned for high performance. The LiNB03 demodulator demodulates the signal which in turn passed to a filter to attenuate the demodulated output and then through an amplifier to increase the signal strength. Digital approach for implementation of QPSK Modulation is attempted here and compared with existing systems. Simulation and characterization is done to freeze design parameters. The system mainly concentrates on parameter like performance, security, minimum size and cost saving which will be the future of satellite communications.
1. INTRODUCTION
In satellite communication, modulation is necessary to transfer the information between satellite and the earth. Free-space optical (FSO) communications is a concept that has been around for many years. Today 's market for space-based optical communications is primarily intersatellite links (ISLs). The usual parameters that system designers want to optimize drive the desire to utilize optical communications onboard a satellite: size, weight and power and of course, cost.
FSO system uses a laser beam as a wireless connectivity between transmitter
Design and Simulation of QPSK Modulator for Optic Inter Satellite Communication:Review
Submitted by
A Penchala Bindushree
4th Sem, M.Tech (DCE)
Acharya Institute of Technology
Bangalore – 560090
Under the guidance of
Internal Guide:
Nataraju A B M.tech, (PhD)
Assistant Professor, ECE Department
Acharya Institute of Technology
Bangalore – 560090
External Guide:
Vijesh T V
Scientist/Engineer ‘SC’
LEOS/ISRO
Bangalore-560013
Abstract
We have proposed a digitally implemented QPSK system for Free-Space Optics systems for future satellite missions. We have used a Laser source of 1550nm wavelength and data rate of 2.5Gbps.The system consists of a modulating and a demodulating block and an advantage of filters added to improve the performance and optimize errors like noise.
The best suited modulator for FSO is Mach-Zehnder modulator which is tuned for high performance. The LiNB03 demodulator demodulates the signal which in turn passed to a filter to attenuate the demodulated output and then through an amplifier to increase the signal strength. Digital approach for implementation of QPSK Modulation is attempted here and compared with existing systems. Simulation and characterization is done to freeze design parameters. The system mainly concentrates on parameter like performance, security, minimum size and cost saving which will be the future of satellite communications.
1. INTRODUCTION
In satellite communication, modulation is necessary to transfer the information between satellite and the earth. Free-space optical (FSO) communications is a concept that has been around for many years. Today 's market for space-based optical communications is primarily intersatellite links (ISLs). The usual parameters that system designers want to optimize drive the desire to utilize optical communications onboard a satellite: size, weight and power and of course, cost.
FSO system uses a laser beam as a wireless connectivity between transmitter
Bibliography: [1] Ijaz, M.; Ghassemlooy, Z. ; Ansari, S. ; Adebanjo, O.”Experimental investigation of the performance of different modulation techniques under controlled FSO turbulence channel” Telecommunications (IST), 2010 5th International Symposium. [2] Asmaa Zaki M., Heba A. Fayed, Ahmed Abd El Aziz, Moustafa H. Aly” The Influence of Varying the Optical Wavelength on ISL Performance Recognizing High Bit Rates” IOSR Journal of Electronics and Communication Engineering. Volume 9, Issue 1, Ver. II (Jan. 2014), www.iosrjournals.org [3] Hashim, A.H. ; Mahad, F.D. ; Idrus, S.M. ; Supa 'at, A.S.M. “Modeling and performance study of inter-satellite optical wireless communication system” Photonics (ICP), 2010 International Conference. [4] M. Serbay; C.Wree; W.Rosenkranz “Impementation of differential precoder for high speed optical DQPSK transmission” ELECTRONICS LETTERS 30th September 2004 Vol.40 No.20 [5] Melanie Ott; Jaun Vela; Dr.Carl Magee; Harry Shaw “Reliability of optical fiber modulators for space flight environments.” Sigma research and engineering,301-286-0127