Modeling of digital communication systems
Description
Know Simulation of digital communication systems you will learn how to build models of digital communication systems using visual simulation environments Engee. Using library blocks Communication Systems you will learn how to build models of communication channels with additive white Gaussian noise, with fading and power losses in free space, plot signal constellations, perform digital modulation and signal demodulation (including OFDM modulation), calculate the bit error rate (BER), filtering, and set phase and frequency distortions of digital signals.
Each section contains a theoretical part and tasks for independent implementation.
Knowledge requirements: completion of courses Welcome to Engee and Visual modeling
Total course time: ~3 hours.
Course program
Modeling of the simplest digital communication line
The general structure of the digital communication system is considered, brief information is given about digital modulation and, in particular, about QPSK modulation, as well as about the Gaussian communication channel. A model of a QPSK-modulated signal passing through a Gaussian communication channel is studied. The bit error rate (BER) is calculated.
Digital modulation and demodulation
The construction of a signal constellation and the calculation of BER for signals with various types of digital modulation (QPSK, BPSK, PSK, QAM and M-APSK) are studied.
Filtering of digital signals
Brief information is given about low-pass filters and about a filter with an impulse response of the "raised cosine" type. A model of a QAM-modulated signal with filtering passing through a Gaussian communication channel with BER calculation is studied.
OFDM modulation
Brief information about OFDM modulation is given and a model of a digital communication system based on OFDM modulation is constructed.
Distortion of digital signals
Channels with fading, signal power loss in free space, phase and frequency distortions are studied. Models demonstrating these types of signal distortions are being constructed.