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This course provides a second certificate completion for FREE from Rahsoft Introduction to Modulation in Communication Systems RAHRF152 is an intro course of Rahsoft Radio Frequency Certificate and it is counted toward the certificate. In this course we have concentrated to simplify the Digital and Analog Modulation topics in a way which students would understand the practicality by providing examples and simulations using GNU Octave open source software. This is a great course to understand the fundamental definitions needed in digital and analog modulation in communication system. General Consideration of Modulation 2. 1.1-Why we need modulation ?3. 1.2 - Baseband and Passband ? What is Demodulation?4. 1.3 - Career and Generic Communication System5. 1.4-Modulation Aspects:Detectability,Bandwidth & Power Efficiency,Bit Error Rate Analog Modulation 6. 2.1 - Amplitude Modulation , AM, Amplitude Demodulation, AM Applications7. How to install GNU Octave Open Source Software Used in this course8. 2.2.1 - Frequency Modulation, FM, Spectrum, FM Specs, High Index9. 2.2.2- FM Demodulation , Slope Detector , FM Pros and Cons10. 2.3- Phase Modulation, PM , FM vs PM , PM Demodulation Digital Modulation 11. Bit Rate , Baud Rate , Binary & M-ary Data, Nyquest Formula , Channel Capacity12. 3.1.1- Amplitude Shift Keying , ASK, Spectral Response Binary Data, B-ASK M-ASK13. 3.1.2- Software Example14. 3.1.3- ASK Demodulation15. 3.2.1-Frequency Shift Keying, FSK Modulator & Demodulator, Demodulation with PLL16. 3.2.2- Software Example17. 3.3.0- Phase Shift Keying (PSK) , BPSK, PSK Modulation18. 3.3.1- PSK Demodulation , PSK Demodulator, mismatch,Costas loop19. 4.1- Inter symbol interference (ISI)20. 4.2- Solving Inter symbol interference (ISI)21. 5.1- Signal Constellation, PSK and FSK Modulation Constellation22. 6.1- Quadrature modulation, I & Q , Adding Quadrature Signals and Simulation23. 6.2.0- QPSK or 4-PSK Modulation24. 5.6.2.1- Software Simulation25. 6.3.0- QPSK Features , Diagrams , Signal Constellation, Demodulation BER26. 6.3.1- I-Q Mismatch27. 6.3.2- Large Phase Change, QPSK Drawbacks , pi/4 QPSK , OQPSK