In recent years, a considerable amount of effort has been devoted, both in industry and academia, towards the design, performance analysis and evaluation of modulation schemes to be used in wireless and optical networks, towards the development of the next and future generations of mobile cellular communication systems. Modulation Theory is intended to serve as a complementary textbook for courses dealing with Modulation Theory or Communication Systems, but also as a professional book, for engineers who need to update their knowledge in the communications area.
The modulation aspects presented in the book use modern concepts of stochastic processes, such as autocorrelation and power spectrum density, which are novel for undergraduate texts or professional books, and provides a general approach for the theory, with real life results, applied to professional design.
This text is suitable for the undergraduate as well as the initial graduate levels of Electrical Engineering courses, and is useful for the professional who wants to review or get acquainted with the a modern exposition of the modulation theory.
The book covers signal representations for most known waveforms, Fourier analysis, and presents an introduction to Fourier transform and signal spectrum, including the concepts of convolution, autocorrelation and power spectral density, for deterministic signals. It introduces the concepts of probability, random variables and stochastic processes, including autocorrelation, cross-correlation, power spectral and cross-spectral densities, for random signals, and their applications to the analysis of linear systems. This chapter also includes the response of specific non-linear systems, such as power amplifiers. The book presents amplitude modulation with random signals, including analog and digital signals, and discusses performance evaluation methods, presents quadrature amplitude modulation using random signals. Several modulation schemes are discussed, including SSB, QAM, ISB, C-QUAM, QPSK and MSK. Their autocorrelation and power spectrum densities are computed. A thorough discussion on angle modulation with random modulating signals, along with frequency and phase modulation, and orthogonal frequency division multiplexing is provided. Their power spectrum densities are computed using the Wiener-Khintchin theorem.

Marcelo Sampaio de Alencar was born in Serrita, Brazil in1957. He received his Bachelor Degree in Electrical Engineering, from the Federal University of Pernambuco (UFPE), Brazil, 1980, his Master Degree in Electrical Engineering, from the Federal University of Paraiba (UFPB), Brazil, 1988 and his Ph.D. from the University of Waterloo, Department of Electrical and Computer Engineering, Canada, 1993. Marcelo S. Alencar has 38 years of engineering experience, and 28 years as an IEEE Member, currently as Senior Member. Between 1982 and 1984, he worked for the State University of Santa Catarina (UDESC).From 1984 to 2003, he worked for the Department of Electrical Engineering, Federal University of Paraiba, where he was Full Professor and supervised more than 60 graduate and several undergraduate students. From 2003 to 2017, he was Chair Professor at the Department of Electrical Engineering, Federal University of Campina Grande, Brazil. He also spent some time working for MCI-Embratel and University of Toronto, as Visiting Professor. Currently he is Visiting Chair Professor at the Department of Electrical Engineering, Federal University of Bahia. He is founder and President of the Institute for Advanced Studies in Communications (Iecom). He has been awarded several scholarships and grants, including three scholarships and several research grants from the Brazilian National Council for Scienti¿c and Technological Research (CNPq), two grants from the IEEE Foundation, a scholarship from the University of Waterloo, a scholarship from the Federal University of Paraiba, an achievement award for contributions to the Brazilian Telecommunications Society (SBrT), an award from the Medicine College of the Federal University of Campina Grande (UFCG) and an achievement award from the College of Engineering of the Federal University of Pernambuco, during its 110th year celebration. Marcelo S. Alencar is a laureate of the 2014 Attilio Giarola Medal.
He published over 450 engineering and scienti¿c papers and twenty-two books: Scienti¿c Style in English, and Cellular Network Planning, by River Publishers, Spectrum Sensing Techniques and Applications, Information Theory, and Probability Theory, by Momentum Press, Information, Coding and Network Security (in Portuguese), by Elsevier, Digital Television Systems, by Cambridge, Communication Systems, by Springer, Principles of Communications (in Portuguese), by Editora Universitária da UFPB, Set Theory, Measure and Probability, Computer Networks Engineering (in Portuguese), Electromagnetic Waves and Antenna Theory (in Portuguese), Probability and Stochastic Processes (in Portuguese), Digital Cellular Telephony (in Portuguese), Digital Telephony (in Portuguese), Digital Television (in Portuguese) and Communication Systems (in Portuguese), by Editora Érica Ltda, History of Communications in Brazil, History, Technology and Legislation of Communications, Connected Sex (in Portuguese), Scienti¿c Diffusion (in Portuguese), Soul Hicups (in Portuguese), Epgraf Grá¿cae Editora. He also wrote several chapters for ten books. His biography is included in the following publications: Who's Who in the World and Who's Who in Science and Engineering, by Marquis Who's Who, New Providence, USA.