direct spread spectrum modulation
Analysis of Simulation Parameters of Pulse Shaping FIR Filter for WCDMA
... a direct sequence spread spectrum (DSSS) signal through the processing gain and the coding gain can be used to enable many DSSS signals to occupy the same channel bandwidth, provided that each signal ...
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Comparative Analysis of Various Digital Modulation Techniques for FHSS WCDMA over AWGN and Fading Channels
... of modulation techniques used in ...digital modulation techniques to CDMA are tested under Rayleigh, Rician fading and AWGN ...The modulation technique which gives less error is ...hopping ...
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Modeling and Simulation of CDMA Codes in Scilab
... as Direct Sequence Code Division Multiple Access ...quadrature-phase modulation and the Gold Code Generator for Global Positioning System ...by spread spectrum ...
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Direct Sequence Spread Spectrum with Barker Code and QPSK
... DS modulation is achieved by modulating the carrier wave with a digital code sequence which has a bit rate much higher than that of the message to be sent. This code sequence is typically a PN code. In effect we ...
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FHSS, DSSS, And Hybrid DS/FH Performance Evaluation For VSAT
... system. Direct Sequence Spread Spectrum (DSSS), Frequency Hopping Spread Spectrum (FHSS), and a hybrid approach of both techniques DS/FH are proposed to solve the ...and spread ...
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Portable instrument for in-vivo infrared oxymetry using spread-spectrum modulation
... The microcontroller is interfaced to the two source connectors through two four- channel current boosters, specifically designed for direct interfacing to LED’s. The current boosters are switched on and off with ...
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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 ...after direct-sequence (DS) ...
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Spread Spectrum Sensing Techniques for Transformer Frequency Response Data
... channels, spread spectrum is proposed in the literature [3]. Spread spectrum can be defined as a modulation technique in which pseudo-random sequence is used in expanding the actual ...
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Performance Comparison Analysis between IEEE 802 11a/b/g/n Standards
... with Direct Sequence Spread Spectrum (DSSS) to operate up to 11 Mbps data rate in the ...unlicensed spectrum using complementary code keying (CCK) modulation ...
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Mitigationof Security Risk in Satellite Communication by using Turbo coded DSSS
... BPSK modulation in AWGN channel and result is compared in terms of BER and SNR ...that direct sequence spread spectrum is applied with binary phase shift keying as the result shows there is ...
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Performance Evaluation of DSSS and FHSS Using Modulation Technique
... applying Direct Sequence spreading is that the Near–Far effects are less in ...FHSS. Spread Spectrum in which the carrier hops from one frequency to other frequency is known as frequency-hop ping ...
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A Secure Message Exchange and Anti-Jamming Mechanism in MANET
... Sequence Spread Spectrum (DSSS) is a common forms of spread spectrum techniques ...classic spread spectrum techniques, senders and receivers need to pre-distribute a secret key, ...
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DIFFERENT SPREADING SEQUENCES FOR PERFORMANCE COMPARISON OF DS-SS SYSTEM B Ch Kiran Patrudu*, D.Anil Prasad, B Ravi Kumar
... 64-QAM modulation techniques and from the simulation results it is found that bit error rate is increasing as the value of M increases ...M-QAM modulation using different spreading sequences (PN, Gold, ...
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Comparative Simulation & Analysis of 2- PSK Spreading Transceiver
... as spread-spectrum ...with spread spectrum makes this technology suitable for un-licensed band ...The spread spectrum transmitter first perform the BPSK symbol mapping using ...
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COMPARISON OF JAMMING EXCISION METHODS FOR DIRECT SEQUENCE/SPREAD SPECTRUM (DS/SS) MODULATED SIGNAL
... An approach used to separate the signal from the jamming in spread spectrum systems is the excision of the portion of spectrum where the interference is located (see Fig. 1). Fig. 2 shows the basic ...
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Effectiveness of Multimedia Learing on achievement in Biology
... From all the results derived above it can be concluded that proposed methodology is much efficient in terms of PSNR, correlation with original watermark, computational time, complexity and invisibility as compared to ...
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Implementing Multiple Security for Audio Steganography
... [9]. Pooja P. Balgurgi, Prof. Sonal K. Jagtap, “Intelligent Processing : An Approach of Audio Steganography”.2012 International Conference on Communication, Information & Computing Technology (ICCICT), Oct. 19-20, ...
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Performance Improvement of Wireless Communications Using Frequency Hopping Spread Spectrum
... hopping spread spectrum is modelled with MATLAB and three different modula- tions ...QAM modulation dose not lead to a remark- able reduction of BER, but with QPSK modulation gives a good ...
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Implementation of Direct Sequence Spread Spectrum Communication System Using FPGA
... the seed bit, which is act as our security key. Without PN sequence we cannot encrypt our original message signal. In general, the PN sequence generated by a polynomial equation. The LFSR (linear feedback shift register) ...
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Comprehensive Review on PN Sequence and their...
... A PN sequence is a reference signal simulating the random samples of discrete digital information and generates the samples in a specific manner so that it follows the correlation property. A correlation and maximal ...
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