Author: Israel Zaki BonanPublisher:
ISBN:
Category : Modulation (Electronics)
Languages : en
Pages : 148
Book Description
Hybrid Simulation of a Differential Four Phase Modulation System
Author: Israel Zaki BonanPublisher:
ISBN:
Category : Modulation (Electronics)
Languages : en
Pages : 148
Book Description
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 880
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Masters Theses and Doctoral Dissertations in the Pure and Applied Sciences Accepted by Colleges and Universities of the United States
Author: Phase-Modulated Optical Communication Systems
Author: Keang-Po HoPublisher: Springer Science & Business Media
ISBN: 9780387243924
Category : Technology & Engineering
Languages : en
Pages : 452
Book Description
Fiber-optic communication systems have revolutionized our telecommunication infrastructures – currently, almost all telephone land-line, cellular, and internet communications must travel via some form of optical fibers. In these transmission systems, neither the phase nor frequency of the optical signal carries information – only the intensity of the signal is used. To transmit more information in a single optical carrier, the phase of the optical carrier must be explored. As a result, there is renewed interest in phase-modulated optical communications, mainly in direct-detection DPSK signals for long-haul optical communication systems. When optical amplifiers are used to maintain certain signal level among the fiber link, the system is limited by amplifier noises and fiber nonlinearities. Phase-Modulated Optical Communication Systems surveys this newly popular area, covering the following topics: - The transmitter and receiver for phase-modulated coherent lightwave systems - Method for performance analysis of phase-modulated optical signals - Direct-detection DPSK signal with fiber nonlinearities, degraded by nonlinear phase noise and intrachannel effects - Wavelength-division-multiplexed direct-detection DPSK signals - Multi-level phase-modulated optical signals, such as the four-phase DQPSK signal. Graduate students, professional engineers, and researchers will all benefit from this updated treatment of an important topic in the optical communications field.
Simulation program for digital transmission systems with phase modulation through non-linear channels
Author: Publisher:
ISBN:
Category :
Languages : pt-BR
Pages :
Book Description
Como alternativa ao cálculo do desempenho através de métodos analíticos, é desenvolvido um programa de simulação de sistemas de transmissão digital com modulação de fase (PSK, Off-set PSK e MSK) e recepção coerente através de canais não lineares. Representando os sinais através de suas envoltórias complexas o programa permite simular qualquer modelo de canal envolvendo filtros e não linearidades, estas representadas através de suas curvas de conversão AM / AM e AM / PM. O programa fornece 3 resultados: Estimativas da probabilidade de erro, do espectro de potência e o diagrama de olho. O ruído térmico é considerado apenas na entrada do receptor. Para o cálculo da probabilidade de erro entretanto este ruído não é simulado sendo seu efeito calculado analiticamente através de um procedimento denominado simulação híbrida. Os resultados obtidos pelo programa são bastante próximos de resultados teóricos e de medidas em diversas aplicações.
Master's Theses and Doctoral Dissertations in the Pure and Applied Sciences
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 172
Book Description
NBS Special Publication
Author: Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 398
Book Description
Advanced Digital Optical Communications
Author: Le Nguyen BinhPublisher: CRC Press
ISBN: 1482226537
Category : Technology & Engineering
Languages : en
Pages : 937
Book Description
This second edition of Digital Optical Communications provides a comprehensive treatment of the modern aspects of coherent homodyne and self-coherent reception techniques using algorithms incorporated in digital signal processing (DSP) systems and DSP-based transmitters to overcome several linear and nonlinear transmission impairments and frequency mismatching between the local oscillator and the carrier, as well as clock recovery and cycle slips. These modern transmission systems have emerged as the core technology for Tera-bits per second (bps) and Peta-bps optical Internet for the near future. Featuring extensive updates to all existing chapters, Advanced Digital Optical Communications, Second Edition: Contains new chapters on optical fiber structures and propagation, optical coherent receivers, DSP equalizer algorithms, and high-order spectral DSP receivers Examines theoretical foundations, practical case studies, and MATLAB® and Simulink® models for simulation transmissions Includes new end-of-chapter practice problems and useful appendices to supplement technical information Downloadable content available with qualifying course adoption Advanced Digital Optical Communications, Second Edition supplies a fundamental understanding of digital communication applications in optical communication technologies, emphasizing operation principles versus heavy mathematical analysis. It is an ideal text for aspiring engineers and a valuable professional reference for those involved in optics, telecommunications, electronics, photonics, and digital signal processing.
FAA/NASA Joint University Program for Air Transportation Research 1993-1994
Author: A Four-phase Modulation System for Use with an Adaptive Array
Author: Jack H. WintersPublisher:
ISBN:
Category : Antenna arrays
Languages : en
Pages : 470
Book Description
This report discusses the use of four-phase modulation in a communication system with an adaptive array. A system is described that provides protection against both conventional (i.e., noise and cw) and smart (in particular, repeat) jamming with rapid acquisition of the signal at the receiver. This report first discusses four-phase modulation techniques and how they can be used with an adaptive array. Reference signal generation for the LMS adaptive array is discussed for these modulation techniques. A communication system is then described that uses one of these modulation techniques. The four-phase signal consists of two orthogonal biphase signals. One signal contains a short code for rapid acquisition. The other contains a long code for protection against smart jammers. A several step signal acquisition technique is also described for the system. The short code timing is first acquired by a sliding correlation method. With the short code used in reference signal generation, the long code timing is rapidly acquired by the Rapid Acquisition by Sequential Estimation method. The long code is then used in reference signal generation.