What is Line Coding?
Generally in a digital communication system, the data transmission capacity of a practical channel is much larger than the individual sources. To utilize the channel capacity effectively , we combine several sources through a digital multiplexer using the process of interleaving. The output of a multiplexer is coded into electrical pulses or waveform to transmit data over the channel. This process is called line code/coding or transmission coding.
Properties of various Line Coding:
Digital data signal can be transmitted by various line coding. A line code should have the following properties:
1. Transmission power and bandwidth should be as small as possible.
2. It should be possible to detect and correct errors.
3. It should be possible to extract timing or clock information from the signal.
4. The code must be transparent ( receiving every possible sequence of data of the coded signal faithfully).