Monday, 21 10 2019

Communications Systems


Communications Systems
Lesson Code:  22Υ604
Level:  Undergraduate
Semester:  5ο



Introduction: Communication concept and model. Basic components and resources of communications systems. Analog and digital systems. Examples. Brief review of the evolution of communications systems.
Analog Transmission: Linear modulation schemes. Amplitude Modulation. Demodulation. Angle modulation. Frequency Modulation. Modulation and demodulation of FM signals. Effect of noise on analog modulation. Signal multiplexing.
Discrete representation of analog waveforms: Sampling theorem (review). Quantization of analog signals. Quantization noise. Pulse-Coded Modulation (PCM) and variants.
Baseband digital transmission: Model of baseband digital transmission. Geometric representation of signals. The signal space. Modulation and demodulation. The Additive White Gaussian Noise channel. The matched filter. Baseband transmission using M-PAM. Probability of error.
Passband digital transmission: Model of passband digital transmission. Analytic equivalent model. Baseband equivalent model. PSK, QAM and FSK modulation. Probability of error.
Examples of communications systems: Description of analog and digital communications systems.
Mathematical appendix: Review of stochastic processes and fundamental principles of Signals and Systems Theory. Impulse response of a system. Linear Time-Invariant systems. Stochastic processes. Stationarity. Statistical averages, joint moments, correlation. Power spectral density. Examples. Ergodicity. Transmission of stochastic processes through Linear Time-Invariant Systems. The Gaussian random process. Narrowband noise.



τ: Logothetis Michael  
   Stilianakis Vasilis
L: Antonakopoulos Theodoros
    Koukias Michael
    Toumpakaris Dimitris-Alexandros
    Mourjopoulos Ioannis