Engineering and Physics University of Central Oklahoma Dr. Mohamed Bingabr Chapter 1 Introduction ENGR 4323/5323 Digital and Analog Communication.

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Presentation transcript:

Engineering and Physics University of Central Oklahoma 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 pigeons, lights and fires. In modern time messages (verbal, images, data) are carried by telephone, internet, satellite, and wireless. Job: there is high demand with high pay. Research: very active

Communication System A/D Converter Encoder Modulator D/A Converter Decoder Demodulator Speech Image Data Medical Environmental Microphone Keyboard CCD Camera Twisted Wires Coaxial Cable Fiber optic Air TV Screen Computer Screen Speakers Printer Channel frequency fading and selectivity Hardware noise and environmental interference

Analog and Digital Messages Analog Signal: Speech waveform, Music sound, temperature and atmospheric pressure. Digital Signal: English text constructed from the ASCII keyboard of 128 symbols. Binary signal (messages constructed from two symbols 0 and 1) and M-ary signals. Advantage of Digital Signal - Cheaper (with microprocessor) - Better Quality (immune to noise, regenerative repeaters)

Analog to Digital Conversion Sampling Theorem Quantization SNR

Pulse-Coded Modulation (PCM) PCM represents each quantized sample by an ordered combination of two basic pulses: p 1 (t) representing 1 and p o (t) representing 0.

Channel Effect Channel Bandwidth –determine transmission rate Signal power –determine the quality of the received signal Signal-To-Noise Ratio Channel Capacity: –Determine the upper bound of transmission rate –C = B log 2 (1 + SNR) bit/s

Modulation and Detection Baseband Signal –Low frequency –Signals generated by the source Modulation –Use the message signal to modulate certain parameters of the (RF) carrier signal of high frequency.

Modulation and Detection Modulation used for –Ease of Radiation –Multiplexing: Simultaneous transmission of multiple signal Demodulation: –Recovering the message signal from the carrier

Digital Source Coding and Error Correction Code Source Coding –Compression techniques to reduce the number of bits representing a message without sacrificing the message quality and accuracy of detection. –Reduce redundancy Error Correction Coding: –Add redundancy to detect the error and correct it.

Brief History of Telecommunication