Lec13 Bandpass Modulation I

Bandpass modulation
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  TE312: Introduction to Digital Telecommunications PART III PASSBAND DIGITAL TRANSMISSION Lecture #13 Coherent Modulation Techniques  Introduction Points to be discussed in this lecture ã   Introduction   ã   Coherent Binary Amplitude Shift Keying   ã   Coherent Binary Phase Shift Keying   ã   Coherent Binary Frequency Shift Keying      Introduction Reading Assignment Simon Haykin, “Digital Communications”, John Wiley & Sons, Inc., 1988, Chapter 7. K. Sam Shanmugam, “Digital and Analog Communication Systems”, John Wiley & Sons, Inc., 1979, Chapter 8.  Introduction Passband modulation shifts the baseband signal spectrum to a carrier frequency  c  f  . It converts the baseband signal to a band-pass signal for transmission through a band-pass channel using a sinusoidal carrier. Band-pass signals propagate well through the atmosphere with reduced antenna size. (Antenna size is proportional to the wavelength of the signal to be transmitted 8 /, 310m/s c c f c λ   = = × .).


Jul 23, 2017
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