PPT-Performance Analysis of Digital Modulation Techniques

Binary modulation schemes ASK FSK PSK n 1 M 2 Only Two output conditions are possible Baud is equal to the bit rate M ary Modulation Techniques QPSK 8PSK 18PSK QAM 16QAM. 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 Even the natives have difficulty mastering this peculiar vocabulary.. . —The Golden Bough. , . Sir James George Frazer. Signal Encoding Techniques. Digital Data, Digital Signal. d. igital . signal. 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. 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). Dr. Mohamed Bingabr. Chapter 1. Introduction. ENGR 4323/5323. Digital and Analog Communication. Why Communication. Communication advances society’s development.. Before. . modern time . verbal messages were carried by runners, carrier . Digital. . Modulation. Announcements:. Slides from . Cioffi. guest lecture posted. . HW 1 solutions posted, graded HWs available soon.. Review . of Lecture 8 (last Wednesday). AM Radio Modulation and Demodulation. 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. Modulation is the process of encoding the baseband or source information (voice, video, text) in a manner suitable for transmission.. It generally involves translating a baseband signal (or source) to a band pass signal, centered at a high carrier frequency.. 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.. Example: ASK, FSK, PSK, QAM. Binary digital modulation. Multilevel digital modulation. Amplitude Shift Keying. Binary-ASK --- BASK. Or On-Off Keying OOK. Uses two amplitude levels for the modulated carrier . Advanced Computer Networks. C13. . Interpreting Signals. DCC 9. th. Ed.. Stallings. Advanced Computer Networks . Data Encoding. 2. Data Encoding Techniques. Digital Data, Analog Signals . [. modem. 1. http://www.gaussianwaves.com/2012/05/performance-comparison-of-digital-modulation-techniques/. Note: M=2^m. Prof. Brian L. Evans. Dept. of Electrical and Computer Engineering. The University of Texas at Austin. 15 - . 2. Introduction. Digital Pulse Amplitude Modulation (PAM). Modulates digital information (symbols) onto amplitude of pulse.