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• For reliable communications, i.e., , all frequency components of the transmitted signal should pass through the channel, which requires: – Frequency components of transmitted signal should be centered at f c; – The channel bandwidth B h should be no smaller than the bandwidth of transmitted signal B m. Sf Sfˆ() () f c f H(f) 1 1 f
AM is defined as a process in which the amplitude of the carrier wave c(t) is varied about a mean value, linearly with baseband signal m(t). AM wave, in its most general form. t = A. 1 + k m t. cos 2π. c. ( )
frequencies. Compare time-domain, frequency-domain, and phasor representations of an AM signal. Explain what is meant by the terms DSB and SSB and state the main advantages of an SSB signal over a conventional AM signal. Calculate peak envelope power (PEP), given signal voltages and load impedances. chapter 3 Carrier Amplitude modulation (AM)
There are various carrier modulation techniques. Among them, amplitude modulation (AM) is considered the oldest. This handout considers AM. 1 Amplitude Modulation Principle. The amplitude-modulated wave may be described by the following formula. s(t) = [1 + kam(t)] c(t) = Ac [1 + kam(t)] cos(2 fct);
Power of AM Signals. The power of an AM signal is the sum of the power of two components. 'AM(t) = (A + m(t)) cos(2 fct) = A cos(2 fct) + m(t) cos(2 fct) | {z } |. carrier. {z } sidebands. The carrier and sideband signals are orthogonal, so powers add. Carrier power is.
Learn how to make AM and FM signal measurements and how to use Keysight’s N9340B handheld spectrum analyzers with AM and FM modulation analysis.
Amplitude Modulation (AM) OBJECTIVES 1. Demonstrate an amplitude-modulated carrier in the time domain for different modulation indexes and modulating frequencies. 2. 3. 4. 5. Determine the modulation index and percent modulation of an amplitude-modulated carrier from the time domain curve plot.
