Lecture 9

Lecture 9 - Channel Capacity Information Measure...

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Channel Capacity
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Information Measure Information in message j bits P I j j = 1 log 2 j P Probability of transmitting the jth message Average information: = = = m j m j j j j P P I P H 1 2 1 log ) / ( / s bits T H R = Source Rate Channel Capacity + = N S B C 1 log 2 If C R < Shannon demonstrated that for signal plus white noise, it is possible to build a system with 0 e P If
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Coding, Channel Coding
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Techniques to reduce errors in digital communication systems Techniques to reduce errors in digital Automatic repeat request (ARC) Forward error correction (FEC) Channel coding as opposed to source coding ARC is typical of computer systems. FEC is typical of large transmission delay systems. We will concentrate in FEC.
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Codes Block Codes are maps of k input binary symbols into n binary symbols n>k (memoryless) n k R / = typically from ¼ to 7/8 with k>3 Convolutional codes are employed in memory systems
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This note was uploaded on 12/29/2011 for the course ENG 3514 taught by Professor Arellano during the Fall '11 term at FIU.

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Lecture 9 - Channel Capacity Information Measure...

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