PPT-Chapter 5. Angle Modulation

Husheng Li The University of Tennessee Phase and Frequency Modulation Consider the standard CW signal We define the total instantaneous angle Phase and Frequency Modulation Phase modulation PM. 2 and 43 of S Haykin and M Moher Introduction to Analog Digital Communications 2nd ed John Wiley Sons Inc 2007 ISBN13 9780471432227 Professor Deepa Kundur University of Toronto Properties of Angle Modulation 2 25 Angle Modulation Phase Modulation The reason for that may be that the channel is bandlimited or that we are assigned a certain frequency band and frequencies outside that band is supposed to be used by others Therefore we are interested in the spectral properties of v arious modulat
 \n\r

Angle modulation is a method of analog modulation in which either the phase or frequency of the carrier wave is varied according to the message signal. In this m Husheng Li. The University of Tennessee. Chopper Sampling . We introduce a switching function such that . x_s. (t)=x(t)s(t), where. Nyquist. Criterion. The sampling rate should be at least twice the bandwidth of the signal, in order to fully reconstruct the signal.. Husheng Li. The University of Tennessee. Phase and Frequency Modulation. Consider the standard CW signal. We define the total instantaneous angle. Phase and Frequency Modulation. Phase modulation (PM). Husheng Li. The University of Tennessee. AM Signals and Spectra. An AM signal can be written as. Power of AM. The total transmit power is given by. We can prove that, at least 50% (often close to 2/3) of the total transmitted power resides in a carrier term that is independent of the signal and thus conveys no message information. (what a waste!). Introduction. There are three parameters of a carrier that may carry information:. Amplitude. Frequency. Phase. Frequency and Phase modulation are closely related and grouped together as . Angle modulation. Lecture Learning Outcomes. Be able to understand, appreciate and differentiate the different signal encoding criteria available.. Class Contents. Signal Encoding Criteria. Digital Data, Analogue Signals. Husheng Li. The University of Tennessee. Course Contents. Basics of communications. Signals and noise. Amplitude modulation. Phase and frequency modulations. Pulse modulation. Analog communication system. Husheng Li. The University of Tennessee. Chopper Sampling . We introduce a switching function such that . x_s. (t)=x(t)s(t), where. Nyquist. Criterion. The sampling rate should be at least twice the bandwidth of the signal, in order to fully reconstruct the signal.. Husheng Li. The University of Tennessee. AM Signals and Spectra. An AM signal can be written as. Power of AM. The total transmit power is given by. We can prove that, at least 50% (often close to 2/3) of the total transmitted power resides in a carrier term that is independent of the signal and thus conveys no message information. (what a waste!). Amplitude Modulation (AM). Time domain equation. y. AM. (t. ) = . Information or message x carrier. . = . m(t) . x A cos(w. c. t. ). . Frequency domain equation. Double . sideband . Prof. Park. NJIT. Problem 1. Which . of the following is NOT produced when two sine waves are . combined through . a nonlinear device?. a. . Components of each of the two original frequencies. b. . Components at the sum and difference frequencies. Techniques . ( 24 marks). Visit for more Learning Resources. Transmission Techniques. Baseband . Transmission . The electrical equivalent of original information is known as the . baseband signal. .