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Introduction to Communication Systems

Introduction to Communication Systems James Flynn Sharlene Katz Communications system Diagram July 1, 2010 Flynn/Katz - SDR 2 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Communications system Diagram July 1, 2010 Flynn/Katz - SDR 3 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Information Source: Audio, image, text, data Input Transducer: Converts source to electric signal Microphone Camera Keyboard Communications system Diagram July 1, 2010 Flynn/Katz - SDR 4 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Output Transducer: Converts electric signal to useable form Speaker Monitor Communications system Diagram July 1, 2010 Flynn/Katz - SDR 5 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Transmitter: Converts electrical signal into form suitable for channel Modulator Amplifier Communications system Diagram July 1, 2010 Flynn/Katz - SDR 6 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Channel: Medium used to transfer signal from transmitter to receiver.

Antenna gain: same power over smaller area. I.e. Power density increased. Reciprocity means transmitting gain is also receive gain for same antenna. Common gains: 2 to 30 db over isotropic. d A TRANSMITTER ANTENNA RECEIVER ANTENNA 27 Flynn/Katz - SDR July 1, 2010

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