frequency-hopping spread-spectrum system
DEVELOPMENT OF A DIGITALLY TUNED QUADRATURE OSCILLATOR
... In this research paper, a new improved version of digitally tuned quadrature oscillator using Op-Amps has been designed and results have been verified by simulation tool PSPICE on Windows platform, which results in ...
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A Review on Frequency Hopping Spread Spectrum Based Anti Jamming Improvement With Encrypted Spreading Codes
... single frequency jamming by building simulation ...the system bit error rate will suddenly rocket up, that indicate system cannot work properly because limit of jamming is very ...
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Frequency Hopping Spread Spectrum Security Improvement with Encrypted Spreading Codes in a Partial Band Noise Jamming Environment
... Although spread spectrum systems are used for narrow- band interference mitigation and have good efficiency in preventing intentional and unintentional channel inter- ference, if jammer uses similar ...
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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 ...FH system is of M-ary frequency shift keying ...a ...
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FHSS, DSSS, And Hybrid DS/FH Performance Evaluation For VSAT
... communication system is affected by several factors such as: interference, and jamming caused by some other parallel networks for the purpose of decreasing the performance of a given ...Sequence Spread ...
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Low Complexity Erasure Insertion in Frequency Hopping Spread Spectrum Communications Subjected to Fading and Partial Band Interference
... Finally, in Fig.6 we evaluated the codeword decoding error prob- ability of a RS(32,20) coded MFSK based SFH/SS system employing the OTT, RTT and MO-RTT erasure insertion schemes over Nakagami- m fading channels ...
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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 ...
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Realization of Simplified Diversity Combining Algorithms for Fast Frequency Hopping System
... Considering realization, we can approximate maximum-likelihood technology and find out the performance of two changing ML method is not very weak and approaches to optimum diversity combining, so we regarded it as ...
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Performance Improvement of Wireless Communications Using Frequency Hopping Spread Spectrum
... high frequency communication is selectively fading be- cause of the multi-path propagation and abundance of interference from the ...Every frequency channel due to interferences and fading shows different ...
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The Performance of Fast Frequency Hopping System in Additive White Gaussian Noise (AWGN)
... faster frequency hopping rates to scrutinize the performance of channel in the presence of AWGN has been ...fast frequency hopping style in the occurrence of AWGN using two linear combination ...
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Column generation for frequency assignment in slow frequency hopping networks
... radio spectrum. This spectrum is a limited resource, it can only support a finite number of fre- ...classical frequency assignment problem (FAP) have com- monly been accepted as an insightful point of ...
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Running, hopping and trotting: tuning step frequency to the resonant frequency of the bouncing system favors larger animals
... the hopping gait is better than the running gait: kangaroos exploit the same resonant frequency better than rhea ...in hopping kangaroos and the spring hare than in running turkeys and rhea (Cavagna ...
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Study of LDPC Coded SFH System with Partial Band Interference
... The system model in this paper is shown as Figure ...SFH system, number of symbols per hop (SPH) is more than one, when the signal is jammed, it will bring about burst symbol ...of system with short ...
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Comprehensive Review on PN Sequence and their...
... MC-CDMA system using discrete wavelet transform” presents the Multicarrier Code Division Multiple Access (MC-CDMA) which is a combination of conventional Code Division Multiple Access (CDMA) and Orthogonal ...
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Time-slot Assignment based mostly Channel Access theme for Reliable Transmission
... using spread spectrum ...dimensional spread spectrum method so that we can hide the random pattern image into low intensity and mid intensity parts of cover ...
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IMPROVING QOS UNDER DDOS ATTACKS IN WIRELESS SENSOR NETWORKS USING ANT SYSTEM
... The hypothesis given in [7] can be extended to other layers also. This hypothesis is useful in optimizing the cross-layer DoS attack. Depending on the modulation scheme choosen for physical layer, jamming the node from ...
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Robust Blind Frequency and Transition Time Estimation for Frequency Hopping Systems
... using the proposed scheme or other ML-based schemes, such as the exhaustive search method, if the transition time of the received signal is close to the boundary of the sampling data block, then one of the ...
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The Application of PXI VSA in Radar Testing System
... the system can be using a key to complete the transmitter pulse envelope test, the transmitter radiation power test, the launch signal spectrum test, if combined with the use of RF switch, before the test ...
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Interference Excision in Spread Spectrum Communications Using Adaptive Positive Time Frequency Analysis
... Figure 6 shows the percentage of chips in error before and after the excision of single and multicomponent inter- ferences. The JSR value of 40 dB is used because at this JSR level with no interference excision, the ...
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Robust Block Selection for Watermarking Video Streams
... two groups: algorithms that hide data in the spatial domain. It means that information is embedded by modifying the pixel values directly [1]-[3], and algorithms that use a transform domain for data hiding. Discrete ...
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