spread spectrum frequency hopping
FHSS, DSSS, And Hybrid DS/FH Performance Evaluation For VSAT
... Sequence Spread Spectrum, Frequency Hopping Spread Spectrum, and a hybrid approach between these two techniques DS/FH for the purpose of improving the efficiency of today's ...
5
Performance Improvement of Wireless Communications Using Frequency Hopping Spread Spectrum
... Frequency hopping spread spectrum is a transmission technology used in wireless networks and a technique to generate spread spectrum by hopping the carrier fre- quency ...
6
Frequency Hopping Spread Spectrum Security Improvement with Encrypted Spreading Codes in a Partial Band Noise Jamming Environment
... narrowband spectrum techniques. Signals of spread spectrum are in- distinguishable from background noise to anyone who does not know the coding ...of spread spectrum is its relatively ...
6
Comparative Analysis of Various Digital Modulation Techniques for FHSS WCDMA over AWGN and Fading Channels
... frequencies. Frequency hopping spread spectrum is a technique to switch from one frequency channel to the other by shifting the ...
6
A Review on Frequency Hopping Spread Spectrum Based Anti Jamming Improvement With Encrypted Spreading Codes
... slow frequency-hopspread spectrum (FHSS)systems that employ binary frequency-shift keying (BFSK) modulation ...the hopping patterns of the users are not ...then frequency dehopper and ...
6
Low Complexity Erasure Insertion in Frequency Hopping Spread Spectrum Communications Subjected to Fading and Partial Band Interference
... Slow Frequency-Hopping Spread-Spectrum (SFH/SS) wireless sys- tems Forward Error-Correction (FEC) codes, such as for example Reed-Solomon (RS) codes are often used, in order to mitigate the ...
5
The Probability of Multiple Correct Packet Reception in Coded Synchronous Frequency Hopped Spread Spectrum Networks
... inclusion and exclusion formula of combinatorics in order to determine the probability systematically, and we could greatly reduce the computational complexity involved in solving the resultant recursive equation upon ...
6
Efficient Transmission of Information using Transmission Code along FHSS
... a spread-spectrum system uses a process other than the information signal to expand, or spread, the bandwidth of the ...for spectrum spreading are direct sequence and frequency ...The ...
5
Robust Blind Frequency and Transition Time Estimation for Frequency Hopping Systems
... In frequency hopping spread spectrum (FHSS) systems, two major problems are timing synchronization and frequency ...estimating frequency and transition time without using ...
13
SECURED COMMUNICATION USING SPREAD SPECTRUM TECHNIQUES
... 3.2 FREQUENCY HOPPING SPREAD SPECTRUM: FH is the type of SS in which the carrier hops randomly form one frequency to ...M-ary frequency shift keying ...
6
Spread Spectrum Sensing Techniques for Transformer Frequency Response Data
... narrow frequency band is required for a single carrier frequency whereas a much wider bandwidth is required for frequency hopping of signals while transmitting the ...
8
Contemporary Spread Spectrum Techniques: A Comparative Study Ashish G. Nandre 1, Yogesh R. Risodkar2
... Spread spectrum techniques use data independent, random sequences to spread a narrow band information signal over wideband of ...entire frequency band; the receiver can correlate the received ...
5
DEVELOPMENT OF A DIGITALLY TUNED QUADRATURE OSCILLATOR
... the frequency of oscillations digitally having good linearity with digital control ...the frequency of oscillations for oscillator circuit can be achieved which is controlled by a digital control word ...
10
Packet-Hiding Mechanism for Selective Jamming Technique
... Conventional anti-jamming techniques dependent on extensively on spread spectrum communications, or some form of jamming avoidance (e.g., slow frequency hopping). Spre[r] ...
9
Time-slot Assignment based mostly Channel Access theme for Reliable Transmission
... and spread spectrum simultaneously ...low frequency, middle frequency and high frequency components and finally watermark is embedded into DCT coefficient by using quantization index ...
6
A Comparison of Steganography in the GIF Image using LSB and Spread Spectrum Method
... clearly spread spectrum method is more secure compared with the method of least significant bits because the method of spread spectrum data in the insert in the first process that is inserted ...
5
The Design and Implementation of Scrambling Wavelength Hopping with AWG Router and Optical Switch over Secure WDM Network
... wavelength hopping configuration using AWG router and optical switch on the transmitter Here, the different wavelengths appear in the output port of AWG router as user’s carrier and transfer to electro -optics ...
6
Simulation and Validation of Spread Spectrum Technique in In- Orbit Testing of the Satellite Transponder
... Using spread spectrum measurement technique of an occupied transponder, the channel frequency response is measured under real operation conditions where as the conventional measurement system may not ...
7
Improved Performance Evaluation of Frequency Hopped spread spectrum using QAM/FSK Modulation Techniques
... Spread Spectrum modulation techniques are defined as the technique in which the bandwidth of the transmitted signal is much greater than the bandwidth of the original message, and the ba[r] ...
5
IMPROVING QOS UNDER DDOS ATTACKS IN WIRELESS SENSOR NETWORKS USING ANT SYSTEM
... Sensor networks using distributed wireless technology is widely used in many applications like disaster relief and tsunami warning systems. These applications lack security and there is no guarantee for QoS.In Wireless ...
9