Synopsis
Principles of Communication Systems contains Introduction to Communication System, Analog and Digital messages, regenerative repeaters, Signal Bandwidth & Power. Size & classification of signal, exponential Fourier series, concept of negative frequencies. Fourier transform and properties, Frequency shifting, Concept of baseband and bandpass signals, Signal transmission through LTI system. Signal energy & Energy Spectral density. Signal power & Power Spectral Density, Input and output PSD, PSD of modulated signal.
Need for frequency translation, Amplitude modulation (DSB-C), Double sideband Suppressed carrier (DSB-SC) modulation, Single sideband modulation (SSB), Vestigial Sideband modulation (VSB),Spectrum and Bandwidth of AM, DSB-SC, SSB & VSB, Calculation of modulation index for AM wave, Modulation index for more than one modulating signals, Power and power efficiency, AM reception.
Phase Modulation (PM) and Frequency Modulation (FM), Relationship between Phase and Frequency Modulation, Modulation Index, Spectrum of FM (single tone): Feature of Bessel Coefficient, Power of FM signal, Bandwidth of tone modulated FM signal, modulation index : AM vs. FM, Spectrum of constant Bandwidth FM, Narrowband and Wideband FM.
FM Modulators and Demodulators : FM generation by Armstrong’s Indirect method, frequency multiplication and application to FM, FM demodulator.
Need of analog to digital conversion, sampling theorem for low pass signal in time domain, and Nyquist criteria, Types of sampling- natural and flat top. Pulse amplitude modulation & concept of TDM : Channel bandwidth for PAM, equalization, Signal Recovery through holding. Pulse Width Modulation (PWM) and Pulse Position Modulation (PPM): Generation & Detection.
Quantization of Signals : Quantization error, Uniform & Non-Uniform types of Quantization, Mid-rise & Mid-tread Quantizer.
Companding : A-law & -law.
Pulse Code Modulation system : Generation & Reconstruction, Differential Pulse code modulation, Delta Modulation, Adaptive Delta Modulation.
Line codes : Properties and spectrum.
Digital Multiplexing and hierarchies : T1, AT&T, E1, CCITT, Scrambling & Unscrambling.
Synchronization : Carrier Synchronization, Bit Synchronization and Frame Synchronization. Intersymbol Interference, Equalization.
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