# Block diagram of a general Communication System.

Jun 18th, 2015
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 A communication systems conveys information from it source to a destination (some distance away).  dissemination of information  combination of circuits and devices  Transmission is the major result  uncertainty is the major characteristic  -Uncertainty is due to noise --Noise is due to (a) unwanted signal perturbation (b) unpredictable nature of information ----- NEED PROBABILITIES  Contributors to communications:  probabilities  Shannons’ theory:  C=Blog2(1+S/N) bps~ Blog2e (S/N) (for small S/N)  development of circuits and devices

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Principles of CommunicationsChap 1 Introduction A communication systems conveys information from it source to a destination (some distance away). dissemination of information combination of circuits and devices Transmission is the major result uncertainty is the major characteristic -Uncertainty is due to noise--Noise is due to ()a unwanted signal perturbation()b unpredictable nature of information----- NEED PROBABILITIES Contributors to communications: probabilities Shannons theory: C=Blog2(1+S/N) bps~ Blog2e (S/N) (for small S/N)development of circuits and devices 1.1Block diagram of a general Communication System. Main Body : Transmitter + Channel + ReceiverInput transducer : Input information V or I Signal ( Analog or digital ) Transmitter : To couple the message to the channel via modulation, filtering & amplifier Purposes :()1 Ease of radiation()2 Reduce the noise and interference()3 For channel assignment()4 For multiplication signals()5 Overcome equipment limitations. Channel : Channel effect Receiver : Extract desired signal, convert signal for input transducer ( demodulator) Output transducer FIGURE 1.1 Block diagram of a communication system1.2 Channel Characteristics.Noise :A. External noise (Atmospheric, man-made, extraterrestrial sources)B. Internal noise A. External noise Atmospheric noise result from spurious radio waves refer

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