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Bandpass Communications: Analog and Digital Signal Techniques

This chapter explores the techniques used in bandpass communications, including analog baseband signals (AM, FM, etc.), digital baseband signals (OOK, BPSK, etc.), and multiplexing (TDM, FDM, CDM). It also covers the generation of AM and FM signals, modulation circuits, frequency spectra, and detection of various modulation schemes.

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Bandpass Communications: Analog and Digital Signal Techniques

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  1. Chapter 5 AM, FM and Digital Modulated Systems

  2. In this chapter, we will study the techniques of bandpass communications. • Analog baseband signal (AM, FM, etc) • Digital baseband signals (OOK, BPSK, etc.) • Multiplexing (TDM, FDM, CDM)

  3. Basic Model for Bandpass Communication Source Destination

  4. Amplitude Modulation

  5. Generation of High-Power AM by Pulse Width Modulation

  6. Costas Loop

  7. Squaring Loop

  8. Spectrum for USSB Signal

  9. Generation of SSB Signals

  10. VSB Spectra

  11. Angle Modulation

  12. Angle Modulator Circuits RFC : Radio Frequency Choke

  13. FM with m(t) = Sinusoidal Signal

  14. Bessel functions: n = 0 ,1, 2, 3, 4, 5, 6

  15. Magnitude spectra for FM or PM

  16. Spectrum of WBFM Signal

  17. Spectrum of Wideband Binary FSK

  18. Pre-emphasis and De-emphasis

  19. Frequency Division Multiplexing

  20. FM Stereo System

  21. FM Broadcasting

  22. Binary Modulated Bandpass Signals

  23. Digital Bandpass Signals

  24. PSD

  25. Detection of OOK

  26. Detection of BPSK

  27. From Frequency Shift Keying section to the end of Chapter 5, the math is quite complex. Thus, we will focus on the concepts and understanding how various techniques work. Section 5.10 will be covered briefly. Section 5.11 will not be covered. Note that Chapter 5 is concerned with the technology. Do not focus too much about the mathematical details.

  28. Frequency Shift Keying

  29. FSK Modem FSK is very popular for telephone modems.

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