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Performance Of Direct Sequence Spread Spectrum Receivers In Pulsed Noise Jamming And In Narrowband Interference
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Book Synopsis Performance of Direct Sequence Spread Spectrum Receivers in Pulsed Noise Jamming and in Narrowband Interference by : Arif Ansari
Download or read book Performance of Direct Sequence Spread Spectrum Receivers in Pulsed Noise Jamming and in Narrowband Interference written by Arif Ansari and published by . This book was released on 1993 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spread Spectrum Systems by : Robert Clyde Dixon
Download or read book Spread Spectrum Systems written by Robert Clyde Dixon and published by Wiley-Interscience. This book was released on 1984 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measured Noise Performance of a Direct-Sequence Spread-Spectrum System and a Comparison of Single- Vice Dual-Channel Delay-Lock Loops by : Chris G. Bartone
Download or read book Measured Noise Performance of a Direct-Sequence Spread-Spectrum System and a Comparison of Single- Vice Dual-Channel Delay-Lock Loops written by Chris G. Bartone and published by . This book was released on 1987 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: A direct-sequence (DS) spread spectrum system which could be used by a conventional amplitude modulated (AM) radio system was designed, built and tested. A delay-lock loop was used to provide code synchronization in the receiver. The noise performance of single-channel delay-lock loop (DCDLL) with no data being transmitted. When data was transmitted a DCDLL was used and the noise performance (probability of bit error) of the DS spread spectrum system was measured. Test results indicate that SCDLL performs as well as or better than the DCDLL. The measured noise performance advantage relative to the DCDLL and that this DS spread spectrum can be used to transmit low rate digital data reliably at values of SNR much than unity. It is recommended that this DS spread spectrum system be considered by the Department of Defense to be implemented in AM radio system to provide low data rate-anti-jam-interference rejection capability.
Book Synopsis Narrowband Interference Rejection Techniques in Direct Sequence Spread Spectrum Systems by : Ronald Athelstan Iltis
Download or read book Narrowband Interference Rejection Techniques in Direct Sequence Spread Spectrum Systems written by Ronald Athelstan Iltis and published by . This book was released on 1984 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of Coded Direct Sequence Spread Spectrum in a Fading Dispersive Channel with Pulsed Jamming by : Branimir R. Vojčić
Download or read book Performance of Coded Direct Sequence Spread Spectrum in a Fading Dispersive Channel with Pulsed Jamming written by Branimir R. Vojčić and published by . This book was released on 1990 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Receiver Optimization and Error Rates for Pseudo-Noise Spread Spectrum Systems with Narrowband Interference Suppression by : John W. Ketchum
Download or read book Receiver Optimization and Error Rates for Pseudo-Noise Spread Spectrum Systems with Narrowband Interference Suppression written by John W. Ketchum and published by . This book was released on 1982 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of a study of maximum likelihood receiver structures for direct sequence spread spectrum communications over channels with multipath distortion and narrowband interference, and several methods of assessing the bit error probability performance of bit-by-bit receivers and maximum likelihood receivers. This work is a continuation of work which focused on the performance of various methods of suppressing narrowband interference using spectral estimation. The previous work gave performance results in terms of SNR improvement provided by interference suppression. The previous results are extended in this report by deriving a receiver structure based on the maximum likelihood (minimum probability of error) principle. Error probability results given include simulation of a bit-by-bit receiver operated in conjunction with dispersive and nondispersive channels with narrowband interference. Also, a technique for assessing the error rate by averaging conditional probabilities is stated which applies to both fixed nondispersive and fixed dispersive channels, and bit-by-bit and maximum likelihood receivers. Probability of error results obtained using this approach are given. (Author).
Book Synopsis Representation of Nonstationary Narrowband Random Processes and Their Application and Effectiveness as Jamming Signals in Spread Spectrum Communication Systems by : Kah Meng Low
Download or read book Representation of Nonstationary Narrowband Random Processes and Their Application and Effectiveness as Jamming Signals in Spread Spectrum Communication Systems written by Kah Meng Low and published by . This book was released on 1987 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: A representation of nonstationary narrowband random processes in terms of nonstationary quadrature components is proposed in a form analogous to that used to represent wide sense stationary narrowband random processes. The representation is then applied t a specific case in which the nonstationary narrowband random process is generated by the product of white noise and a deterministic periodic signal and then is processed by a narrowband filter. This representation is used in the modeling of a bi-level pulsed noise jammer which is assumed to be present in a communication channel. The effect of such a jammer on a direct sequence, binary phase shift keyed (DS-BPSK) spread spectrum communication receiver is evaluated and characterized interns of the error rate performance of the receiver. Families of performance curves are plotted to demonstrate the effect of various parameters, namely signal-go-noise ratio, jammer power to signal power ratio, and processing gain, on the error rate of the complete spread spectrum receiver. The analysis carried out differentiates between two cases, namely fast jammers and slow jammers. However, the analytical tools developed make it possible to consider either one of the two cases without resorting to quasi-stationary arguments as has been done in the past. (Theses).
Book Synopsis Multi-Carrier Spread-Spectrum by : Khaled Fazel
Download or read book Multi-Carrier Spread-Spectrum written by Khaled Fazel and published by Springer Science & Business Media. This book was released on 2006-08-12 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aims to edit the ensemble of the contributions and research results in this field that have been presented during the 5th International Workshop on Multi-Carrier Spread-Spectrum (MC-SS 2005), held in Oberpfaffenhofen, Germany.
Book Synopsis Narrowband Interference Suppression Techniques Using Decision Feedback Filtering in Direct Sequence Spread Spectrum Systems by : Katherine Jauregui Lovette
Download or read book Narrowband Interference Suppression Techniques Using Decision Feedback Filtering in Direct Sequence Spread Spectrum Systems written by Katherine Jauregui Lovette and published by . This book was released on 1994 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Performance of Direct-sequence Spread-spectrum Multiple-access Systems Including Jamming and Partial Code Correlation Effects by : Nersi Nazari
Download or read book The Performance of Direct-sequence Spread-spectrum Multiple-access Systems Including Jamming and Partial Code Correlation Effects written by Nersi Nazari and published by . This book was released on 1987 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measured Effects of Repeater Jamming on Direct-Sequence Spread Spectrum Receivers That Use Envelope Detectors by : Paul Evans
Download or read book Measured Effects of Repeater Jamming on Direct-Sequence Spread Spectrum Receivers That Use Envelope Detectors written by Paul Evans and published by . This book was released on 1989 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of repeater jamming on a direct sequence spread spectrum communications system that uses an envelope detector were experimentally determined. A friendly signal transmitter, jamming signal transmitter, noiseless channel, and receiver were designed, built and tested. The spreading sequences of the friendly and jamming transmitters modulated a carrier to create an on-off keyed (OOK) signal. The OOK signal from the jammers was delayed and added to the friendly signal. The delays ranged from zero to 4 chips, and the J/S ratios ranged from -20 to 20 dB. This signal was then envelope detected and correlated with a replica of the spreading sequence of the transmitters. The results of the correlation show that in instances of high jamming and low jamming, reliable communication should occur. In cases where the jammer power and friendly signal power are nearly equal, the output of the correlator will not produce a signal that allows for correct tracking and therefore will not provide reliable communications. Theses. (rh).
Book Synopsis Spread Spectrum Techniques by : Robert C. Dixon
Download or read book Spread Spectrum Techniques written by Robert C. Dixon and published by . This book was released on 1976-11-01 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Analysis of a Coherent Frequency Hopped Spread Spectrum Receiver in the Presence of Jamming, Phase Uncertainty, and Non-ideal Channel Response by : Chun-Meng Su
Download or read book Performance Analysis of a Coherent Frequency Hopped Spread Spectrum Receiver in the Presence of Jamming, Phase Uncertainty, and Non-ideal Channel Response written by Chun-Meng Su and published by . This book was released on 1989 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measured Effects of Repeater Jamming on Direct-Sequence Spread Spectrum Receivers That Use Envelope Detectors by :
Download or read book Measured Effects of Repeater Jamming on Direct-Sequence Spread Spectrum Receivers That Use Envelope Detectors written by and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of repeater jamming on a direct sequence spread spectrum communications system that uses an envelope detector were experimentally determined. A friendly signal transmitter, jamming signal transmitter, noiseless channel, and receiver were designed, built and tested. The spreading sequences of the friendly and jamming transmitters modulated a carrier to create an on-off keyed (OOK) signal. The OOK signal from the jammers was delayed and added to the friendly signal. The delays ranged from zero to 4 chips, and the J/S ratios ranged from -20 to 20 dB. This signal was then envelope detected and correlated with a replica of the spreading sequence of the transmitters. The results of the correlation show that in instances of high jamming and low jamming, reliable communication should occur. In cases where the jammer power and friendly signal power are nearly equal, the output of the correlator will not produce a signal that allows for correct tracking and therefore will not provide reliable communications. Theses. (rh).
Book Synopsis Narrowband Interference Suppression in Spread Spectrum Communication Systems by :
Download or read book Narrowband Interference Suppression in Spread Spectrum Communication Systems written by and published by . This book was released on 1995 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of significant interest to the United States military is the ability of an enemy to deny or disrupt the operation of the Global Positioning System. To combat this threat the GPS JPO initiated the Tactical GPS AntiJam Technology project, which yielded a prototype Digital Excision Filter (DEF) to remove narrowband jammers. This research describes the work performed to get tht DEF hardware operational and extends the previous research performed in this area. Comdisco's Signal Processing Worksystem was used to examine the effect of the DEF on the probability of bit error. This research uses peak to average correlation value, probability of bit error, and percent jammer power removed to examine the performance of the DEF. Fourteen jamming scenarios are examined using CW, pulsed CW, and broadband noise jammers. The DEF effectively rejected all of the jammers except the broadband noise jammer. In scenarios other than the broadband noise jammer, the DEF removed over 98% of the jammer power. The bit error rate curves show that the DEF significantly enhanced the performance of the system in extreme jamming environments. The results presented in this research show that the DEF is a viable, robust option to remove narrowband interference.
Book Synopsis Performance of Multitone Direct Sequence Spread Spectrum in the Presence of Narrowband and Partialband Interference by : Virat Deepak
Download or read book Performance of Multitone Direct Sequence Spread Spectrum in the Presence of Narrowband and Partialband Interference written by Virat Deepak and published by . This book was released on 2002 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book BULLETIN TOME CIII written by and published by Srpska akademija nauka i umetnosti. This book was released on 1992-05-14 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: CONTENS 1. B. Bo2id, N. Vidojevid, N. Novovid-Simovid, R. Keredki — The influence of austenitization conditions on the correlation between the microstructure and mechanical properties of low-alloyed CrNiMo Steel 1 2. B. Bo2i6, Z. Cvijovie, D. Mihajlovid — An Analysis of the shape of intermetallic phases 9 3. M. M. Ristid, P. Kostio, Jong-I-lee Park — The possibility of obtaining YBa2Cu30), with required properties 17 4. L. J. Challis, A. J. Kent, V. W. Rampton — Listening to Electrons — 23 5. B. Bo06, Z. Cvijovid, D. Mihajlovid — Stereometric parameters of eutectic Microconsti:tuent in Al-Zn-Mg-Cu Alloys 37 6. I. S. Stojanovid, Zorka D. Stojanovie, M. L. Dukid — Analysis of new methods proposed for the narrow-band interference Isuppresion in telecommunication systems using spread spectrum technique — — — 45 Ово дело је лиценцирано под условима лиценце Creative Commons - Attribution-Noncommercial-No Derivative Works 3.0 Serbia http://creativecommons.org/licenses/by-nc-nd/3.0/rs/deed.en
