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Author: John G. Proakis Publisher: ISBN: Category : Languages : en Pages : 115
Book Description
This report describes results of an investigation of narrowband interference suppression in a pseudo-noise (PN) spread spectrum digital communication system in which the signal is also distorted by channel multipath and fading. Techniques for determining the coefficients of a linear, interference suppression filter are described, which are based on linear prediction and conventional spectral analysis methods. Numerical results are presented on the effectiveness of the linear filter in suppressing the interference. Error rate results, obtained via Monte Carlo simulation are presented for a receiver that employs interference suppression and equalization for a fading multipath channel. (Author).
Author: John G. Proakis Publisher: ISBN: Category : Languages : en Pages : 115
Book Description
This report describes results of an investigation of narrowband interference suppression in a pseudo-noise (PN) spread spectrum digital communication system in which the signal is also distorted by channel multipath and fading. Techniques for determining the coefficients of a linear, interference suppression filter are described, which are based on linear prediction and conventional spectral analysis methods. Numerical results are presented on the effectiveness of the linear filter in suppressing the interference. Error rate results, obtained via Monte Carlo simulation are presented for a receiver that employs interference suppression and equalization for a fading multipath channel. (Author).
Author: John W. Ketchum Publisher: ISBN: Category : Languages : en Pages : 123
Book Description
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).
Author: Publisher: ISBN: Category : Languages : en Pages : 111
Book Description
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.
Author: John Doherty Publisher: ISBN: Category : Languages : en Pages : 56
Book Description
This report presents research results focused on the mitigation of both narrowband and multiple access interference in direct sequence spread spectrum communication systems. Both linear and nonlinear adaptive algorithmic approaches are developed and reported. Specific attention has been paid to making the algorithmic practicable. In addition to the algorithmic development, a software simulation for a code division multiple access system is developed using a commercially available programming environment.
Author: Ralph F. Guertin Publisher: ISBN: Category : Languages : en Pages : 127
Book Description
To realize the full performance advantage of a pseudonoise spread-spectrum communication system, a receiver must suppress strong narrowband interferers. Conventional frequency-domain excision techniques are complicated by spreading effects due to the sidelobes of the sin(x)/x function. This paper shows that such problems can be avoided by regarding the N samples of a band-limited times series and its finite Fourier transform as a vector in an N-dimensional space. Narrowband interference can be suppressed by projecting the data vector onto the subspace orthogonal to the one that best fits the interference. The theory developed here includes a least squares criterion for finding this subspace. (RH).
Author: John G. Proakis
Author: John G. Proakis
Author: John W. Ketchum
Author: Katherine Jauregui Lovette
Author: Ronald Athelstan Iltis
Author: James A. Lascody
Author: Paul W. Bandy
Author: 
Author: Aparna Vadhri
Author: John Doherty
Author: Ralph F. Guertin