PPT-Chapter 3: First generation systems-Analog Modulation

Amplitude Modulation AM Time domain equation y AM t Information or message x carrier mt x A cosw c t Frequency domain equation Double sideband . 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 (AM, FM, PM). Digital data to analog signal. (ASK, FSK, BPSK, QAM). Analog data to digital signal. (PCM, DM). Digital data to digital signal. (line codes). Signal Encoding Techniques (modulation and encoding). 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. Converting . digital data to a bandpass analog signal is traditionally called . digital-to-analog . conversion. . Converting . a low-pass analog signal to a bandpass analog . signal is . traditionally called analog-to-analog conversion. . 1. Introduction. A digital signal is superior to an analog signal because it is more robust to noise and can easily be recovered, corrected and amplified. For this reason, the tendency today is to change an analog signal to digital data. In this section we describe two techniques, . Analog data to analog signal. (AM, FM, PM). Digital data to analog signal. (ASK, FSK, BPSK, QAM). Analog data to digital signal. (PCM, DM). Digital data to digital signal. (line codes). Signal Encoding Techniques (modulation and encoding). Techniques . ( 24 marks). Visit for more Learning Resources. Transmission Techniques. Baseband . Transmission . The electrical equivalent of original information is known as the . baseband signal. . Audio/video signals are . analog. in nature. Analog signals can take . infinite. number of values. Hence more difficult to detect at receiver after noise corruption. PCM converts analog signals to digital pulses. Overview. Communication is a battle between signal and noise/distortion. Chapter 1 . Summary. Information representation. Communication system block diagrams. Analog versus digital systems. Performance metrics. BY . Mr.Sukchatri Prasomsuk. Contents :. 3.1 Analog and Digital. 3.2 Periodic and Aperiodic Signals. 3.3 Analog Signals. 3.4 Time and Frequency Domains. 3.5 Composite Signals. 3.6 Digital Signals. . ). Data Transmission And Digital Communication. Lecture 5– 2019/1440. By: Elham Sunbu. OUTLINE. Sampling.. Pulse Amplitude Modulation .. Analogue to Digital conversion.. Sampling (PCM).. Pulse Code Modulation Advantages.. Lecture 2– 2019/1440. By: Elham Sunbu. OUTLINE. Modulation. Analog Modulation.. AM. FM. PM. Digital Modulation.. Modulation. Operation of varying amplitude, frequency or phase of carrier signal accordingly with the instantaneous amplitude of the message signal.. Department of Computer Engineering. Kasetsart University. 01204325 Data Communications and Computer Networks. Based on . lecture materials from . Data Communications and Networking, 5. th. ed.,. Behrouz A. . First and second generation communication systems . divide. the total available bandwidth into smaller bandwidth channels . However, third generation systems . share. the entire bandwidth without mutual interference.