Secure Optical QAM Transmission Using Chaos Message Masking

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Farhan Qamar ◽  
Muhammad Khawar Islam ◽  
Romana Farhan ◽  
Mudassar Ali ◽  
Syed Zafar Ali Shah
Keyword(s):  
Optical Networks ◽  
Optical Communication ◽  
Binary Data ◽  
Data Stream ◽  
Modulation Scheme ◽  
Communication Link ◽  
Semiconductor Laser Diode ◽  
Chaotic Region ◽  
Data Rates ◽  
Point To Point

AbstractThis work presents the joint use of advance modulation scheme i. e. m-QAM and optical chaos to combine the best of the two advantages i. e. higher data rates and security. A semiconductor laser diode is driven into chaotic region using direct modulation scheme and 4-QAM signal is added by Chaos message masking (CMS). The chaotically masked data stream is transmitted over an optical communication link to investigate the propagation issues and synchronization of chaos at the receiver. The transmitted chaos is synchronized at the receiver to unmask the QAM stream and binary data by using subtraction rule and conventional QAM demodulator, respectively. The deterioration of constellation diagrams and bit error rate found dependent upon transmitter/receiver synchronization and link parameters. The use of 4-QAM chaotic scheme is extendable to m-QAM and is applicable to long haul, short haul point to point and for passive optical networks.

scholarly journals Improvement of Multipath Channel Performance for Optical MIMO-OFDM in LED Modulation with Fully Generalized Spatial-Frequency

2021 ◽  
Author(s):  
Nandhini Devi R ◽  
Leones Sherwin VimalrajS ◽  
Lydia J
Keyword(s):  
Optical Communication ◽  
Spatial Multiplexing ◽  
Modulation Scheme ◽  
New Concepts ◽  
Data Rates ◽  
Error Ratio ◽  
Bit Error Ratio ◽  
Mimo Ofdm ◽  
Transmission Diversity ◽  
Ofdm Signals

This paper suggests a scheme to generalize the idea of LED index modulation concept by using the spatial multiplexing principle to relay complex OFDM signals through various channels such as AWGN, Rayleigh and Rician by splitting these signals into their real-imaginary and positive-negative components. In order to combat ISI as well as to increase the channel capacity. The MIMO-OFDM efficiency analysis, taking into account the constraint of the forward current of the LED is extracted. The accuracy of the theoretical results is verified by comparing the Bit Error Ratio (BER) reduction and improvement to the (SNR) results under varying condition of the channel. Using MIMO-OFDM as next-generation techniques, along with QAM aims to provide development of new concepts that will lead to the growth of future optical communication. Simulation results validate data rates gained over optical communication using LED modulation scheme and the pure transmission diversity method.

scholarly journals AquaOptical: A Lightweight Device for High-rate Long-range Underwater Point-to-Point Communication

2010 ◽  
Vol 44 (4) ◽  
pp. 55-65 ◽  
Author(s):  
Marek Doniec ◽  
Carrick Detweiler ◽  
Iuliu Vasilescu ◽  
Mandar Chitre ◽  
Matthias Hoffmann-Kuhnt ◽  
...  
Keyword(s):  
Long Range ◽  
Optical Communication ◽  
High Rate ◽  
Software Architectures ◽  
Optical Communication System ◽  
Clear Water ◽  
System A ◽  
Trade Offs ◽  
Data Rates ◽  
Point To Point

AbstractThis article describes AquaOptical, an underwater optical communication system. Three optical modems have been developed: a long-range system, a short-range system, and a hybrid system. We describe their hardware and software architectures and highlight trade-offs. We present pool and ocean experiments with each system. In clear water, AquaOptical achieved a data rate of 1.2 Mbit/s at distances up to 30 m. In water with visibility estimated at 3 m, AquaOptical achieved communication at data rates of 0.6 Mbit/s at distances up to 9 m.

Analysis of Inter-Satellite Optical Wireless Communication System

2017 ◽  
Vol 7 (10) ◽  
pp. 10
Author(s):  
Rajbir Singh
Keyword(s):  
Wireless Communication ◽  
Optical Networks ◽  
Data Transmission ◽  
High Speed ◽  
Open Space ◽  
Communication Link ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
High Speed Data ◽  
Speed Data Transmission

Optical networks are bandwidth efficient networks are used for long haul communication providing seamless data transfer. For high speed data transmission in open space between different satellites, Inter-satellite Optical wireless communication (IsOWC) is widely used .In this paper we have evaluated the performance of IsOWC communication link for high speed data transmission .The performance of the system is evaluated on the basis of qualitative parameters such as Q-factor and BER using optisystem simulator.

Performance of LED for line-of-sight (LoS) underwater wireless optical communication system

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Alaa G. Nasser ◽  
Mazin Ali A. Ali
Keyword(s):  
Optical Communication ◽  
Link Quality ◽  
Line Of Sight ◽  
Modulation Scheme ◽  
Underwater Communication ◽  
Optical Communication System ◽  
High Data ◽  
Wireless Optical Communication ◽  
Noise Rate ◽  
Wireless Optical Communications

AbstractUnderwater wireless optical communications (UWOC) recently emerge as a solution to the problem of underwater communication for link with a high data rate, low delay, safety, and high immunity. In this study, the line of sight (LoS) method based on LED used for UWOC with different modulation schemes. The bit error rate (BER), signal-to-noise rate, and quality factor are used for assessing system performance and link quality. Besides the effect of transmitting angle, distance link (d), and transmitting power (PT) are analysed. Results show that 8-pulse position modulation (PPM) is the best modulation scheme for achieving a good link in the LoS method.

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