Author: Tharek Abdul Rahman
Publisher:
ISBN:
Category : Data transmission systems
Languages : en
Pages : 100

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Book Description

Author: J. Krishnamurthy
Publisher:
ISBN:
Category :
Languages : en
Pages : 88

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Book Description
A class of Robust Detection Schemes for the detection of a class of time varying signals in additive disturbance are proposed and analyzed and their performance is evaluated. The proposed detection schemes are applicable for the detection of both binary and M-ary Amplitude Shift Keyed Signals. Two detection schemes are proposed for solving the detection problem where the samples of the received signal contain pure signal components that are all unequal. These detection schemes are designated as nonparametric detection scheme and Detection Scheme with Fixed Thresholds (DSFT). The performance of these detectors is compared with that of the Least Squares Detector. It is observed that the proposed detection schemes are robust and generally lead to lower probability of error. The asymptotic relative efficiency for the detectors is shown to be greater than unity under a variety of noise conditions. The performance of the proposed detectors is immune to intersymbol interference if it is assumed that the intersymbol interference can be replaced by an unknown constant. These detectors lead to other advantages such as being unaffected by unknown amounts of DC drifts or changes in the mean values of the noise. (Author).

Author: J. Krishnamurthy
Publisher:
ISBN:
Category :
Languages : en
Pages : 37

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Book Description
A robust detection scheme, called Detection Scheme with Learning of Thresholds (DSLT), for the detection of M-ary Amplitude Shift Keyed Signals is proposed and analyzed. It is shown that DSLT performs better (in the sense of lower probability of error) than the Detection Scheme with Fixed Thresholds. The improvement in performance is due to the fact that DSLT assumes a priori information regarding the approximate form of noise distribution, unlike DSFT. The performance of DSLT is independent of the mean value of the noise, unknown amounts of DC drifts and intersymbol interference if it can be assumed that the intersymbol interference can be replaced by an unknown constant. (Author).

Author: Adam Dennis Hall
Publisher:
ISBN:
Category : Gaussian distribution
Languages : en
Pages :

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Book Description

Author: J. Krishnamurthy
Publisher:
ISBN:
Category :
Languages : en
Pages : 101

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Book Description
Two Robust Detection Schemes for the detection of a class of time varying signals in additive disturbance are proposed and analyzed and their performance is evaluated. The proposed detection schemes, called Robust Detection Scheme I (RDSI) and Robust Detection Scheme II (RDSII) are applicable when the samples of the received signal or a filtered version of the received signal contain pure signal components that are all equal. It is shown that both binary and M-ary Phase Shift Keyed and Frequency Shift Keyed Signals can be detected by using RDSI and RDSII. The performance of the detectors is compared with that of the Mean and Sign detectors. It is observed that the proposed detectors generally lead to lower probability of error, except when the Mean and the Sign detectors are the Maximum Likelihood detectors. Analytical expressions for the average probability of error, the asymptotic relative efficiency and the asymptotic efficiency are derived and it is shown that the proposed detectors are superior or equivalent to the Sign detector and superior to the Mean detector in nongaussian noise. (Author).

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 372

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Book Description

Author: Alexander M. Wyglinski
Publisher: Artech House
ISBN: 1630814598
Category : Technology & Engineering
Languages : en
Pages : 375

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Book Description
Based on the popular Artech House classic, Digital Communication Systems Engineering with Software-Defined Radio, this book provides a practical approach to quickly learning the software-defined radio (SDR) concepts needed for work in the field. This up-to-date volume guides readers on how to quickly prototype wireless designs using SDR for real-world testing and experimentation. This book explores advanced wireless communication techniques such as OFDM, LTE, WLA, and hardware targeting. Readers will gain an understanding of the core concepts behind wireless hardware, such as the radio frequency front-end, analog-to-digital and digital-to-analog converters, as well as various processing technologies. Moreover, this volume includes chapters on timing estimation, matched filtering, frame synchronization message decoding, and source coding. The orthogonal frequency division multiplexing is explained and details about HDL code generation and deployment are provided. The book concludes with coverage of the WLAN toolbox with OFDM beacon reception and the LTE toolbox with downlink reception. Multiple case studies are provided throughout the book. Both MATLAB and Simulink source code are included to assist readers with their projects in the field.

Author: Le Nguyen Binh
Publisher: CRC Press
ISBN: 142008206X
Category : Science
Languages : en
Pages : 610

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Book Description
The need for advanced transmission techniques over long haul optically amplified communications has prompted a convergence of digital and optical communications. Digital Optical Communications explores the practical applications of this union and applies digital modulation techniques to optical communications systems.After reviewing the fundamental

Author: Scott Michael Koziol
Publisher:
ISBN:
Category :
Languages : en
Pages : 324

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Book Description
This thesis presents a novel non-coherent wireless communication receiver design for intercepting and demodulating frequency hopping spread spectrum (FHSS) signals. This interception receiver is based upon phase modulation to amplitude modulation conversion (PM to AM), and is specifically designed for demodulating a slow frequency-hopped signal that has differentially encoded phase shift keying (DPSK) modulation. The receiver will also demodulate non-frequency hopped DPSK signals. Matlab(Superscript Trade Mark Symbol) simulations show that if a signal has a signal to noise ratio (SNR) greater than approximately 30 dB, the intercept receiver can demodulate it by using the following: a bank of filters for PM to AM conversion, envelope detectors for each filter in the bank, and a pattern recognition algorithm that processes the envelope detector outputs, combines them, and maps the result into bits. The performance of the receiver is characterized with simulations and analytical calculations.

Author: Mário Fernando Santos Ferreira
Publisher: CRC Press
ISBN: 0429557191
Category : Technology & Engineering
Languages : en
Pages : 98

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Book Description
This book provides an updated description of the most relevant types of highly nonlinear fibers. It also describes some of their actual applications for nonlinear optical signal processing. Multiple types of highly nonlinear fibers are considered, such as silica-based conventional highly nonlinear fibers, tapered fibers, photonic crystal fibers, and fibers made of highly nonlinear materials, namely lead-silicate, tellurite, bismuth oxide, and chalcogenide glasses. Several nonlinear phenomena occurring on such highly nonlinear fibers are described and used to realize different functions in the area of all-optical signal processing.  Describes several nonlinear phenomena occurring on optical fibers, namely nonlinear phase modulation, parametric and stimulated scattering processes, optical solitons, and supercontinuum generation.  Discusses different types of highly nonlinear fibers, namely silica-based conventional highly nonlinear fibers, tapered fibers, and photonic crystal fibers.  Examines fibers made of highly nonlinear materials, namely lead-silicate, tellurite, bismuth oxide, and chalcogenide glasses.  Describes the application of several nonlinear phenomena occurring on highly nonlinear fibers to realize different functions in the area of all-optical signal processing, namely optical amplification, multiwavelength sources, pulse generation, optical regeneration, wavelength conversion, and optical switching. Mário F. S. Ferreira received his PhD degree in 1992 in physics from the University of Aveiro, Portugal, where he is now a professor in the Physics Department. Between 1990 and 1991, he was at the University of Essex, UK, performing experimental work on external cavity semiconductor lasers and nonlinear optical fiber amplifiers. His research interests have been concerned with the modeling and characterization of multisection semiconductor lasers, quantum well lasers, optical fiber amplifiers and lasers, soliton propagation, nanophotonics, optical sensors, polarization, and nonlinear effects in optical fibers. He has written more than 400 scientific journal and conference publications and several books in the area of mathematical physics, optics, and photonics. He has served as chair and committee member of multiple international conferences, as well as guest editor and advisory board member of several international journals.