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[PDF] Top 20 Direct-sequence spread-spectrum ultrasonic testing device

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Direct sequence spread spectrum ultrasonic testing device

Direct sequence spread spectrum ultrasonic testing device

... Direct-sequence spread-spectrum ultrasonic testing device Abstract Techniques for providing an ultrasonic flaw detection system are ...wide-band ... See full document

16

An improved algorithm for channel allocation on direct sequence spread spectrum

An improved algorithm for channel allocation on direct sequence spread spectrum

... using Direct Sequence Spread Spectrum (DSSS) technology (Goldsmith, ...such device can interfere with a WLANs network, slowing down its performance and potentially breaking network ... See full document

25

Implementation of Direct Sequence Spread Spectrum Communication System Using FPGA

Implementation of Direct Sequence Spread Spectrum Communication System Using FPGA

... Then the output is goes to the correlator block. The device used is known as correlator or detector. In this project, we have used a modified version of conventional detector at the receiver to detect the signal ... See full document

9

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM 
(DS/SS) MODULATED SIGNAL

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL

... Furthermore, the development of 3GPP M2M communication is in its infancy, and its development further raises numerous security issues that deserve investigation. As a part of a security remedy in MTC security, we ... See full document

10

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM 
(DS/SS) MODULATED SIGNAL

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL

... Since we use 5-fold cross-validation procedure, the predictive accuracies on the testing data of the 5 run of each k are averaged and reported as the predictive accuracies. In Table 2, classification result with ... See full document

7

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM 
(DS/SS) MODULATED SIGNAL

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL

... in sequence to counter the breakdowns WEP security also lacks the proper explanation of key ...the device could not be easily altered in case, the user loses its device then the intruder can utilize ... See full document

22

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM 
(DS/SS) MODULATED SIGNAL

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL

... The ultrasonic sensor emits a signal that propagates in the air at the velocity of sound as shown in figure ...The ultrasonic sensor is composed of a multi vibrator, fixed to the ...delivers ... See full document

8

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM 
(DS/SS) MODULATED SIGNAL

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL

... 6. PROPOSED ALGORITHM IMPLEMENTAION SQL server database was used in implementation that consists of three tables; the first is rules that represents Rtable, the second is summation that represents Stable, and the last ... See full document

8

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM 
(DS/SS) MODULATED SIGNAL

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL

... In this work, we apply data mining for predicting learning disability in school going children. It is defined as the learning problems in children. Proposed work is carried out on 1020 instances of school going children ... See full document

10

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM 
(DS/SS) MODULATED SIGNAL

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL

... In this paper we present a new approach to recognize Tifinagh characters. The proposed system realized with Matlab uses gradient direction function as a feature extraction method and the artificial neural networks as a ... See full document

9

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM 
(DS/SS) MODULATED SIGNAL

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL

... during testing and the second error is False Rejection Rate (FRR), which results from the genuine template that the system recognizes as the query template wrongly [26, ... See full document

11

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM 
(DS/SS) MODULATED SIGNAL

COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL

... and testing process is repeatedly executed until all observations act as testing ...for testing, and consequentially the accuracy measures is ...and testing of classification ... See full document

10

kywords: Direct Sequence Spread Spectrum, Correlation, Acquisition, Delay-Lock Loop, De-spreading.

kywords: Direct Sequence Spread Spectrum, Correlation, Acquisition, Delay-Lock Loop, De-spreading.

... Acquisition This section deals with the ideas and considerations of how to bring the locally generated code and the received code signal into perfect time-alignment. This process is known as acquisition. The ... See full document

15

Detection of direct sequence spread spectrum signals

Detection of direct sequence spread spectrum signals

... Due to the ubiquitous use of wireless communication devices, techniques to efficiently use and manage system resources, such as the available radio frequency (RF) spectrum, have been developed and are implemented ... See full document

204

Direct Sequence Spread Spectrum with Barker Code and QPSK

Direct Sequence Spread Spectrum with Barker Code and QPSK

... used spread spectrum technique and explained in the next sectioIf we are really paranoid about being eavesdropped, we can take further steps to make signal difficult to ...the spectrum, Figure 5 ... See full document

6

V4: DIRECT SEQUENCE SPREAD SPECTRUM MODULATION AND DEMODULATION... 1

V4: DIRECT SEQUENCE SPREAD SPECTRUM MODULATION AND DEMODULATION... 1

... Figure 5‐1: DSSS correlation based demodulator. The signal r(t) comes from the channel model and includes filtering and noise addition. The spread codes are tiled into a vector of length N. These vectors are ... See full document

21

A Study of Direct Sequence Spread Spectrum Technique for Data Compression Purpose

A Study of Direct Sequence Spread Spectrum Technique for Data Compression Purpose

... In SS communications [6], a low level wideband signal can easily be hidden within the same spectrum as a high power signal where each signal appears to be noise to the other. The heart of these SS systems is a ... See full document

13

Design of a direct sequence spread spectrum system for power line communication

Design of a direct sequence spread spectrum system for power line communication

... O'Neal, Jr., "Overview of Power Distribution Line Carrier Communications Systems," IEEE C;~obat. Telecommunications Conference, Nov[r] ... See full document

98

Using chaotic sequence in direct sequence spread spectrum based on code 
		division multiple access (DS CDMA)

Using chaotic sequence in direct sequence spread spectrum based on code division multiple access (DS CDMA)

... even for very long sequences. In addition, an enormous number of different sequences can be generated simply by changing its initial condition. Chaotic sequences are deterministic, reproducible, uncorrelated and ... See full document

10

Frequency Hopping Spread Spectrum (FHSS) vs. Direct Sequence Spread Spectrum (DSSS) in Broadband Wireless Access (BWA) and Wireless LAN (WLAN)

Frequency Hopping Spread Spectrum (FHSS) vs. Direct Sequence Spread Spectrum (DSSS) in Broadband Wireless Access (BWA) and Wireless LAN (WLAN)

... as Spread Spectrum modulation and has its origins in the ...of Spread Spectrum technologies, one can mention the inherent transmission security, resistance to interference from other radio ... See full document

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