Line code: Difference between revisions

Revision as of 08:59, 11 April 2006

Revision as of 00:35, 4 May 2006

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A line coded signal must not contain a DC-component (the average signal level should be 0), because transport of a DC-component is impossible in case of long wires. An included DC-component would therefore lead to an offset at the receiving end, and thus to a higher decoding error probability.

Line coding should make it possible for the receiver to synchronise itself to the [[Phase (waves)|phase]] of the received signal. If the synchronisation is not ideal, then the signal to be decoded will not have optimal differences (in amplitude) between the various digits or symbols used in the line code. This will increase the error probability in the received data.

It is also preferred for the line code to have a structure that will enable error detection.