spread spectrum frequency hopping signals
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 ...
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Comparative Analysis of Various Digital Modulation Techniques for FHSS WCDMA over AWGN and Fading Channels
... Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudo random sequence ...
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Low Complexity Erasure Insertion in Frequency Hopping Spread Spectrum Communications Subjected to Fading and Partial Band Interference
... as a flat Nakagami-m fading medium [5] and the transmitted signals are also exposed to Patial Band Gaussian Interference (PBGI) [1, 2]. We derive the exact Probability Density Functions (PDF) of the de- cision ...
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Spread Spectrum Sensing Techniques for Transformer Frequency Response Data
... different signals can be transmitted by s ignals randomly hop among a set of predefined arrangement of ...narrow frequency band is required for a single carrier frequency whereas a much wider ...
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Detection of direct sequence spread spectrum signals
... radio frequency (RF) or wireless transmissions against compromise, adverse channel effects and jamming signals ...sequence spread spectrum (DSSS) signaling, where codes are used to communicate ...
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Frequency Hopping Spread Spectrum Security Improvement with Encrypted Spreading Codes in a Partial Band Noise Jamming Environment
... sequence spread spectrum sys- tems is proposed in ...sequence spread spectrum (DS-SS) signals in frequency selective fading ...
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Performance Improvement of Wireless Communications Using Frequency Hopping Spread Spectrum
... convert signals from time domain to frequency do- main and vice ...the frequency and simulate them in MATLAB and as result the simulated spectrums are an- ...next frequency hopping ...
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Overlapping M ary Frequency Shift Keying Spread Spectrum Multiple Access Systems using Random Signature Sequences
... multiple-access spread-spectrum communication system using binary frequency shift keying (BFSK) or M-ary frequency shift keying (MFSK) and noncoherent demodulation is ...the frequency ...
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INFORMATION HIDING TECHNIQUE: DIGITAL WATERMARKING
... high frequency “detail” in the image separately from the low frequency ...low frequency areas can then be compressed which is acceptable as they are most viable for ...
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IJCSMC, Vol. 5, Issue. 5, May 2016, pg.808 – 813 The Review Paper on Securing Wireless Network from External Threats
... 5. Communications satellites :– Satellites communicate via microwave radio waves, which are not deflected by Earth's atmosphere. satellites are stationed in space, typically in geosynchronous orbit 35,400 km above ...
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The Acquisition and Short Time Fourier Transform of Lung Sounds
... can't longitudinal and transverse objective assessment of lung sounds, long-term monitoring lung sounds and other physiological signals correlation is also very difficult. The digital lung sounds acquisition and ...
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Survey on Various Channel Models for Data Transmission
... 3) Filters utilized for fading procedure ought to have a Gaussian shaped power spectrum (frequency domain) with Doppler spread of power spectrum equivalent to double the standard deviation ...
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Recognition of Electronic Disguised Voices by the Means of MFCC
... the frequency spectrum of speech signals, and mel-frequency cepstrum coefficients (MFCCs) can be used to well describe frequency spectral properties, MFCC-based features are supposed to ...
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Estimation of Time-Scaling Factor for Ultrasound Medical Images Using the Hilbert Transform
... signal spectrum is plotted with the Gaussian spectrum used for simulation, see Figure ...central frequency. Signals were artificially stretched from − 15% to 15%, to cover a large range of ...
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Column generation for frequency assignment in slow frequency hopping networks
... slow frequency hopping (SFH) is going beyond this one-to-one mapping and assigns multiple frequen- cies to each ...one frequency, but changes its trans- mitting frequency within a specific ...
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Comprehensive Review on PN Sequence and their...
... Suzi Seroja Sarnin et. al. [2010] highlights in the paper ” Performance Study of BPSK and 8-PSK Using Cyclic Codes in CDMA Environment” the performance of BPSK and 8-PSK in Code Division Multiple Access (CDMA) ...
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Interference Excision in Spread Spectrum Communications Using Adaptive Positive Time Frequency Analysis
... sequence spread spectrum (DSSS) ...received spread spectrum signal is decomposed into its time-frequency (TF) functions using an adaptive signal decomposition algorithm, and the ...
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Time-slot Assignment based mostly Channel Access theme for Reliable Transmission
... low frequency pattern for watermarking of image then they added spread spectrum signal to the watermark ...low frequency patterns and spread spectrum watermark are embedded in ...
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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 ...
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Robust Block Selection for Watermarking Video Streams
... Abstract— In this paper a robust video watermarking method is presented, which embeds data in the wavelet domain using edge detection. The algorithm uses the luminance values around the edges where changes are less ...
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