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Discusses continuous wave (CW) modulation techniques like AM and FM, with a significant focus on the impact of noise.
"Focus on the ," he muttered, adjusting a dial. He bypassed the digital encryption layers entirely, using the book’s aging diagrams to calculate a narrow-band analog override. He was injecting a "heartbeat" back into the city's emergency sirens—a simple, analog tone that would trigger the manual overrides.
Frequency Modulation (FM) and Phase Modulation (PM), including Carson's Rule for FM bandwidth.
Mathematical evaluation of signal-to-noise ratios (SNR) in AM and FM receivers, including the threshold effect. 3. Digital Communication Systems
Use platforms like LibreTexts or MIT OpenCourseWare for free communication theory material.
The heart of the book lies in its treatment of digital systems. Long before "Digital Communications" became a separate course, Shanmugam dedicated nearly half his text to:
Unlike some older texts that separate the two, Shanmugam treats analog and digital systems as parts of a single spectrum of technology, starting with a shared foundation in Random Signal Theory and probability. Practical Focus: The book includes over 60 worked examples
Frequency Modulation (FM) and Phase Modulation (PM), detailing bandwidth requirements using Carson's Rule.
: Communication is treated as a sequence of signal processing operations where each block has defined input/output requirements. 4. Educational Features
There is a specific charm to engineering textbooks from the late 1970s. They were written before MATLAB became a crutch. The diagrams are clear, hand-drawn style illustrations. The examples require a calculator and a brain, not a software script. Many professors who learned from this book in the 80s now explicitly recommend the PDF to their students because the fundamentals "haven't changed" regarding AM, FM, and basic PSK.
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However, for , these "limitations" are often strengths. You cannot understand OFDM without understanding QAM and FDM first. You cannot understand modern error correction without understanding basic channel capacity. Shanmugam provides the foundation.
An introduction to how information is measured and how error-correction coding improves system reliability. Why Engineers Seek the "Shanmugam PDF"
Autocorrelation functions and Power Spectral Density (PSD).