scholarly journals Steganographic transmission in optical networks with the use of direct spread spectrum technique

2015 ◽  
Vol 9 (8) ◽  
pp. 771-780
Author(s):  
Pawel Laka ◽  
Lukasz Maksymiuk
Keyword(s):  
Optical Networks ◽  
Spread Spectrum ◽  
Direct Spread

SIMULATION OF DIRECT SPREAD SPECTRUM COMMUNICATION SYSTEM ON THE HARDWARE MODULE EMONA DATEX. EVALUATION OF THE EFFECT OF NOISE ON THE QUALITY OF DEMODULATION

2019 ◽  
Author(s):  
Maksim Zhmakin ◽  
Irina Chadyuk ◽  
Aleksey Nadymov
Keyword(s):  
Spread Spectrum ◽  
Communication System ◽  
Spread Spectrum Communication ◽  
Direct Spread ◽  
Simulation Results

A variant of implementation of a communication system with direct spread spectrum is presented in this article, simulation results are also presented, the main parameters of the system are taken, and conclusions are drawn.

scholarly journals Research on Formation of Microsatellite Communication with Genetic Algorithm

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Guoqiang Wu ◽  
Yuguang Bai ◽  
Zhaowei Sun
Keyword(s):  
Spread Spectrum ◽  
Communication System ◽  
Formation Flying ◽  
Design Method ◽  
Ldpc Code ◽  
Spread Spectrum Communication ◽  
Design System ◽  
Generic Algorithm ◽  
Optimizing Design ◽  
Direct Spread

For the formation of three microsatellites which fly in the same orbit and perform three-dimensional solid mapping for terra, this paper proposes an optimizing design method of space circular formation order based on improved generic algorithm and provides an intersatellite direct spread spectrum communication system. The calculating equation of LEO formation flying satellite intersatellite links is guided by the special requirements of formation-flying microsatellite intersatellite links, and the transmitter power is also confirmed throughout the simulation. The method of space circular formation order optimizing design based on improved generic algorithm is given, and it can keep formation order steady for a long time under various absorb impetus. The intersatellite direct spread spectrum communication system is also provided. It can be found that, when the distance is 1 km and the data rate is 1 Mbps, the input wave matches preferably with the output wave. And LDPC code can improve the communication performance. The correct capability of (512, 256) LDPC code is better than (2, 1, 7) convolution code, distinctively. The design system can satisfy the communication requirements of microsatellites. So, the presented method provides a significant theory foundation for formation-flying and intersatellite communication.

Hiding Messages in Audio Files Using Direct Spread Spectrum

2021 ◽  
Author(s):  
Alexandr Kuznetsov ◽  
Oleksii Smirnov ◽  
Victor Zhora ◽  
Alexander Onikiychuk ◽  
Olha Pieshkova
Keyword(s):  
Spread Spectrum ◽  
Direct Spread ◽  
Audio Files

scholarly journals Improved Chaotic Sequence Generation Method Based on Direct Spread Spectrum

2019 ◽  
Vol 1237 ◽  
pp. 042006
Author(s):  
Fang Liu ◽  
Shiyao Jia ◽  
Xiaodan Xu ◽  
Minghao Tian
Keyword(s):  
Spread Spectrum ◽  
Chaotic Sequence ◽  
Sequence Generation ◽  
Direct Spread
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