Communication Engineering Principles I

At the end of this course, the students should be able to: 1. explain the purpose of modulation; 2. describe the different types of modulations techniques, state how they differ and identify the limitations in their application; 3. discuss the broadcast bands and specifications of different modulation techniques; 4. describe, using block diagrams, the evolution of TV systems; and 5. prescribe the best modulation technique for different broadcast scenarios.

Modulation. Reasons for modulation. Types of modulation. Amplitude modulation systems: Comparison of AM systems, Methods of generating, and detecting AM, DBS, SSB signals. Frequency mixing and multiplying, frequency division multiplexing, applications of AM systems. Frequency modulation systems: Instantaneous frequency, frequency deviation, modulation index, Bessel coefficients, significant sideband criteria, bandwidth of a sinusoidally modulated FM signal, power of an FM signal, narrowband FM, direct and indirect FM generation, various methods of FM demodulation, discriminator, phase-lock loop; limiter, pre- emphasis and de-emphasis, stereophonic FM broadcasting. FM broadcast band specification, block diagram of FM radio receiver, limiter and ratio detector, automatic frequency control, squelch circuit, FM mono and FM stereo receivers. AM broadcast band and specification. FM broadcast band and specification. Image frequency. FM mono and FM stereo receivers. TV broadcast band and specification. Signal format, transmitter and receiver block diagrams of Black and White TV, and Color TV.