Monte carlo simulation off direct sequence spread spectrum for indoor radio communication in a rician fading channel

1992 ◽  
Vol 139 (6) ◽  
pp. 620 ◽  
Author(s):  
H.S. Misser ◽  
A. Kegel ◽  
R. Prasad
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Spread Spectrum ◽  
Fading Channel ◽  
Direct Sequence Spread Spectrum ◽  
Rician Fading ◽  
Direct Sequence ◽  
Radio Communication ◽  
Indoor Radio ◽  
Rician Fading Channel

scholarly journals Implementation of DSSS system of image using MATLAB

2020 ◽  
Vol 19 (3) ◽  
pp. 1358
Author(s):  
Samir Jasim Mohammed ◽  
Kadhim Hassan Kaittan
Keyword(s):  
Spread Spectrum ◽  
Fading Channel ◽  
Binary Data ◽  
Direct Sequence Spread Spectrum ◽  
Linear Feedback ◽  
Rician Fading ◽  
Rician Fading Channel ◽  
Pn Sequences ◽  
Correlation Properties ◽  
Spread Spectrum Systems

In direct sequence spread spectrum systems, pseudo sequence random (PN) are used to spreading data bits. There are various type of PN sequences are available with good correlation properties, on mostly are generating pn by linear feedback shift register (LFSR). Will examine in this paper we describe spreading binary random and spreading the image As well as studying probability bit error rate of DSSS system with change of the channel (Add white Gaussian noise channel, Rayleigh fading channel, Rician fading channel). Our study will be performed using MATLAB. Terms of completed my articles in building system developed to security transmitter and receiver the information of theft against communication digital system talk as well as the increase of data rate information. Was this design a way process of his used in applications military and have a major role also in the most applications requiring protect high for many information binary data and image. So that the system designed as fits practice and prevent the overlap the outside after it has become send signals in communication system exhibition penetration and Intentional attacks or other breaches.

scholarly journals Implementation of the asynchronous signals reception method with the direct sequence spread spectrum

2020 ◽  
Vol 30 (2) ◽  
pp. 49-54
Author(s):  
I. V. Egorov ◽  
D. V. Gaivoronskii
Keyword(s):  
Spread Spectrum ◽  
Communication Systems ◽  
Block Diagram ◽  
Random Sequence ◽  
Direct Sequence Spread Spectrum ◽  
Practical Implementation ◽  
Direct Sequence ◽  
Radio Communication ◽  
Radio Stations ◽  
Synchronization Mechanisms

The physical and logical organization of most existing communication systems provides for additional options (transmission of known preambles, the presence of an additional synchronization channel) that simplify synchronization. At the same time, in the practical implementation of radio communication systems, it is necessary to solve the problems of developing additional synchronization mechanisms that can reduce the time it takes to synchronize to reduce energy consumption and increase channel capacity. Thus, the existing problem of the asynchrony of the generators of physically remote radio stations is relevant. One of the possible solutions is asynchronous signal reception with the direct sequence spread spectrum. It allows converting the original binary signal into a pseudo-random sequence for modulating the carrier. The current article is devoted to the characterization of this method and has the following items presented: the transmitter and receiver block diagram, sufficient to explain the proposed method; methods for compensating for effects arising from the asynchrony of the transmitter and receiver generators. Since synchronization is generated according to the correlation peaks that correspond to the data bits, it is possible to set the frequency of the chips on the transmitter to jitter artificially and supplement the pseudo-random sequence with several random chips, which complicates the unauthorized detection of the transmitted signal.

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