CSE3213_06_LineBlockCodingW2012_Part_1

CSE3213_06_LineBlockCodingW2012_Part_1 - component which is...

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1 Digital Transmission of Digital Data: Line and Block Coding, Digital Transmission Modes CSE 3213, Winter 2012 Instructor: Dusan Stevanovic Required reading: Garcia 3.6
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2 Analog vs. Digital Transmission (cont.) low-pass channel (digital signal) digital data digital data
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3 Line Coding: Design Consideration Line Coding process of converting binary data (sequence of bits) to a digital signal digital signal depends ‘linearly’ on information bits - bits are transmitted ‘one-by-one’ - different from block coding Data vs. Signal Level data levels – number of values / levels used to represent data (typically only two: 0 and 1) signal levels – number of values / levels allowed in a particular signal DC Two signal levels, two data levels. Three signal levels, two data levels.
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4 Line Coding: Design Consideration (cont.) DC Component in Line Coding some line coding schemes have a residual (DC)
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Unformatted text preview: component, which is generally undesirable transformers do not allow passage of DC component DC component extra energy – useless! Self-Synchronization (Clocking) – to correctly interpret signal received from sender receiver’s bit interval must exactly correspond to sender’s bit intervals if receiver clock is faster/slower, bit intervals not matched receiver misinterprets signal self-synchronizing digital signals include timing information in itself, to indicate the beginning & end of each pulse (see pp. 8-10) 56 kbps 0.0178 ms 5 Line Coding Schemes – can be divided into four broad categories uses only one non-zero voltage level (0 and +) uses two non-zero voltage levels (+ and -) uses three voltage level (+, 0, -) Line Coding: Design Consideration (cont.) Multilevel uses more than three voltage levels...
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This note was uploaded on 02/14/2012 for the course CSE 3213 taught by Professor A during the Winter '10 term at York University.

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CSE3213_06_LineBlockCodingW2012_Part_1 - component which is...

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