ece4305_L07

ece4305_L07 - Source Coding, Channel Coding, Communication...

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Unformatted text preview: Source Coding, Channel Coding, Communication Channels ECE4305: Software-Defined Radio Systems and Analysis Professor Alexander M. Wyglinski Department of Electrical and Computer Engineering Worcester Polytechnic Institute Lecture 7 Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Source Coding, Channel Coding, Communication Channels Data Transmission Source Encoding Channel Encoding Communication Channels Anatomy of a Typical Digital Communication System Digital Source Source Encoding Channel Encoding Digital Mod Digital-to- Analog RF Front- End RF Front- End Analog- to-Digital Digital Demod Channel Decoding Source Decoding Digital Sink Channel Digital Domain Analog Domain Transmitter Receiver Figure: Generic representation of a digital communication transceiver. Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Source Coding, Channel Coding, Communication Channels Data Transmission Source Encoding Channel Encoding Communication Channels Sending Messages I Digital communications involves the transmission of a message m ( t ) and producing a reconstructed version of the message m ( t ) at the output of the receiver I Our goal is to have P ( m ( t ) 6 = m ( t )) as small as needed for a particular application I Probability of Error: Pe = P ( m ( t ) 6 = m ( t )) I Various data applications possess different P e requirements I Voice: Pe 10- 3 I Data: Pe 10- 5- 10- 6 I Fiber optics: Pe 10- 9 Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Source Coding, Channel Coding, Communication Channels Data Transmission Source Encoding Channel Encoding Communication Channels Purpose of Source Encoder I Given u = sequence of source symbols and v = sequence of source encoded symbols: I We should have v i v as close to random as possible I Components of v are uncorrelated, i.e., unrelated I Why do we perform source encoding?...
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ece4305_L07 - Source Coding, Channel Coding, Communication...

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