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A Knowledge Based Interference Rejection Scheme For Direct Sequence Spread Spectrum Systems
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Book Synopsis A Knowledge-Based Interference Rejection Scheme for Direct-Sequence Spread-Spectrum Systems by :
Download or read book A Knowledge-Based Interference Rejection Scheme for Direct-Sequence Spread-Spectrum Systems written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spread-spectrum signals are used widely in military and commercial communication systems due to their interference rejection capability and their lower probability of interception. In military applications the effects of intentional interference (jamming) are mitigated by the processing gain of the spread-spectrum system. In many spread-spectrum systems, processing gain alone is not sufficient to achieve satisfactory system performance and additional interference rejection techniques need to be employed. The interference suppression circuit is placed prior to the spectrum despreader with the goal of reducing the jammer/interferer energy to an adequately low level that can be handled by the system processing gain. We have presented a novel knowledge-based interference cancellation scheme for direct sequence spread-spectrum systems. This innovative approach utilizes: (1) IPUS, an expert system for the Integrated processing and Understanding of signals, to monitor the communication signal environment in order to determine the parameters of interfering signals within a pre-specified accuracy, and (2) Expert system rules to select from a library of preselected techniques, suitable interference rejection schemes based upon the knowledge obtained from monitoring the signal environment. The effectiveness of this novel interference rejection capability is demonstrated by considering a number of interference scenarios and using the software package SPW(copyright), a time-domain Signal Processing Worksystem.
Book Synopsis Narrowband Interference Rejection in Direct-sequence Spread-spectrum Systems Using Time Domain Adaptive Filters by : Cheryl L. Stutzmann
Download or read book Narrowband Interference Rejection in Direct-sequence Spread-spectrum Systems Using Time Domain Adaptive Filters written by Cheryl L. Stutzmann and published by . This book was released on 1998 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Convex Projections Method for Improved Narrowband Interference Rejection in Direct Sequence Spread Spectrum Systems by : Krishna Rama Narayanan
Download or read book A Convex Projections Method for Improved Narrowband Interference Rejection in Direct Sequence Spread Spectrum Systems written by Krishna Rama Narayanan and published by . This book was released on 1994 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Interference Rejection Techniques to Aid Coarse Acquisition in Direct-sequence Spread-spectrum by : Lynn Denise Gottesman
Download or read book Interference Rejection Techniques to Aid Coarse Acquisition in Direct-sequence Spread-spectrum written by Lynn Denise Gottesman and published by . This book was released on 1993 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Narrowband Interference Excision in Hybrid Frequency-hopping/direct-sequence Spread-spectrum Systems by : Carlos Jaime Chávez
Download or read book Narrowband Interference Excision in Hybrid Frequency-hopping/direct-sequence Spread-spectrum Systems written by Carlos Jaime Chávez and published by . This book was released on 2003 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: A direct-sequence spread-spectrum (DSSS) receiver is vulnerable to being desensitized by high-power narrowband signals within its wide received bandwidth. A solution to this problem is to detect the interfering signals and remove them from the received bandwidth in a process called narrowband interference excision. This can be achieved through a number of existing techniques. However, a hybrid system that utilizes both DSSS and frequency-hopping spread-spectrum (FHSS) techniques complicates the solution. This thesis investigates one technique for narrowband interference excision in the context of such a hybrid frequency-hopping/direct-sequence spread-spectrum (FH/DSSS) system. This technique is based on the discrete Fourier transform (DFT). An overview of DFT-based excision employing an overlap-and-add architecture is given. The critical properties of the window function used are examined, including windowing loss, excision lass, and interference rejection. Finally, the application of DFT-based excision in a hybrid FH/DSSS system is explored.
Book Synopsis IEEE International Conference on Personal Wireless Communications by :
Download or read book IEEE International Conference on Personal Wireless Communications written by and published by . This book was released on 1997 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings & Exhibition--future Access by :
Download or read book Proceedings & Exhibition--future Access written by and published by . This book was released on 1997 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interference Effects in Direct Sequence Spread Spectrum Communications Systems by : Ward James Davies
Download or read book Interference Effects in Direct Sequence Spread Spectrum Communications Systems written by Ward James Davies and published by . This book was released on 1989 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interference Nulling in Direct-sequence Spread-spectrum Systems Using a Main-beam Reference in the Delay Space by : Mark A. Jones
Download or read book Interference Nulling in Direct-sequence Spread-spectrum Systems Using a Main-beam Reference in the Delay Space written by Mark A. Jones and published by . This book was released on 1993 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sequential Acquisition Schemes for Direct-sequence Spread-spectrum Systems by : Gurudutt S. Hosangadi
Download or read book Sequential Acquisition Schemes for Direct-sequence Spread-spectrum Systems written by Gurudutt S. Hosangadi and published by . This book was released on 1999 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Interference on Direct Sequence Spread-spectrum Systems by : Fook Loong Lo
Download or read book Effects of Interference on Direct Sequence Spread-spectrum Systems written by Fook Loong Lo and published by . This book was released on 1985 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Filtering of Direct-sequence Spread Spectrum Systems with Frequency-hop Interference by : John Keelan Grosspietsch
Download or read book Filtering of Direct-sequence Spread Spectrum Systems with Frequency-hop Interference written by John Keelan Grosspietsch and published by . This book was released on 1984 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Probability of Capture and Rejection of Primary Multiple-Access Interference in Spread-Spectrum Networks by :
Download or read book Probability of Capture and Rejection of Primary Multiple-Access Interference in Spread-Spectrum Networks written by and published by . This book was released on 1987 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The probability of capture is evaluated for the situation in which several transmitters use the same spread-spectrum code to contend for the attention of a single receiver. The first stage in the capture mechanism is that of acquisition of capture; randomization of the arrival time has been proposed by Davis and Cronemayer to provide delay capture and the probability of this occurrence has been derived. We are concerned with the second stage, that of retaining capture in the presence of interference from the contending users. The probability of retaining capture is computed via accurate approximations and upper bounds for direct-sequence, frequency-hopped and hybrid spread- spectrum signaling formats and for different data modulation and demodulation schemes. The calculation of the overall probability of capture is carried out for spread-spectrum systems with and without forward-error-control; in the latter case Reed-Solomon codes, as well as binary convolutional codes, are considered. Finally, the capability of rejecting primary multiple-access interference in spread-spectrum radio networks is examined by computing the maximum number of users which can contend for the same receiver without causing the probability of capture to fall below some desirable level.
Book Synopsis Spread Spectrum Systems and Interference Rejection Techniques by :
Download or read book Spread Spectrum Systems and Interference Rejection Techniques written by and published by . This book was released on 1979 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Multiple Access Interference Rejection Technique Using Weighted Despreading Functions for Direct-Sequence Code Division Multiple Access Communications by : Yuejin Huang
Download or read book A Multiple Access Interference Rejection Technique Using Weighted Despreading Functions for Direct-Sequence Code Division Multiple Access Communications written by Yuejin Huang and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "A Multiple Access Interference Rejection Technique Using Weighted Despreading Functions for Direct-sequence Code Division Multiple Access Communications" by 黃耀進, Yuejin, Huang, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123707 Subjects: Wireless communication systems Code division multiple access Spread spectrum communications
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:
