FEKT-MPC-TSDAcad. year: 2021/2022
The course deals with principals, methods and characteristics of communication systems. It focuses on modern digital systems and modulation methods in particular. However, student of the course can also intensify his/her knowledge of analog modulations, their parameters and implementations. The theoretical information obtained at lectures are subsequently verified by laboratory measurements with specially designed instruments and also by computer simulations with models built in the MATLAB-SIMULINK environment. During the professional trainings students learn how to compute basic parameters needed for communication system design using practical examples.
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Lectures:1) Signals in communication systems. Basic waveform representations of binary digits. Modulation rate, bit rate. Computation of signal examples.2) Line codes. Required channel bandwidth. General digital communication system. Technical means for signal transmission.3) Noise in communication systems. AWGN channel. Probability of error. Matched filter. Correlation receiver.4) Modulations of harmonic carrier wave, analog modulations AM, FM and PM.5) Basic keying techniques (ASK, FSK, BPSK). Problems of carrier signal recovery in the BPSK receiver. Differential phase shift keying.6) Basic parameters and features of the modulation system. Modulations QPSK, O-QPSK, MSK, FFSK, GMSK and comparison of their spectra.7) Modulations π/4-DQPSK, 8PSK, MQAM, CAP. Digital quadrature demodulator.8) Intersymbol interference (ISI) and pulse shaping filters. Equalizers (adaptive, DFE, Viterbi). Example of radio channel equalization. 9) Synchronization (transition detector, Early-Late gate synchronizer). Scrambling. Methods of error control. Interleaving (block i., convolutional i.). Pulse modulations (PAM, PWM, PPM).10) Digital representations of analog signals. Quantization. Pulse coded modulations (PCM, DPCM, DM, SDM) and their simulation models.11) Multiplexing (FDM, TDM, CDM) and multiple access (FDMA, TDMA, ALOHA). Spread spectrum systems. Orthogonal frequency division multiplex (OFDM).12) Modulations in optoelectronics. Effect of the noise in passband.13) Introduction to the information theory. Channel capacity. Trellis coded modulation (TCM).
Laboratory measurements:1) Waveforms and frequency spectra of basic signals.2) Methods for the reduction of error probability.3) Data encoding for transmission.4) Scrambler / descrambler.
5) Basic keying techniques.6) Spare exercise.
Professional trainings:1) Waveforms and frequency spectra of data baseband signals. Calculation of basic signal parameters.2) Examples of calculation of AM signal parameters. Derivation of the AM frequency spectrum. Examples of product demodulation.3) Examples of calculation of FM and PM signal parameters. Example of stereo multiplex.4) Demonstrations and mathematical description of digital modulations. Parameters of quadrature amplitude modulation (QAM).5) Calculation of parameters of PAM and PWM. Dynamic range of the analog-to-digital converter. Quantization noise. Slope overload distortion of DM. Comparison of PCM and DPCM.6) Calculation of the probability of error. Examples from information theory.
Computer excercises:1) MATLAB, HDB3 encoder, AWGN channel model.2) Matched filter and correlation receiver.3) Basic keying techniques (ASK, FSK, PSK).4) Principle of quadrature modulations (QPSK, 16QAM).5) Pulse modulations (DM, ADM, SDM, PCM).6) Spread-spectrum techniques.
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Exercise in computer lab