What is line coding explain?

Line coding is the process of converting digital data to digital signals. By this technique we converts a sequence of bits to a digital signal. At the sender side digital data are encoded into a digital signal and at the receiver side the digital data are recreated by decoding the digital signal.

What are the basic line coding techniques?

The unipolar, polar and bipolar line coding schemes can be further categorised as either non-return to zero (NRZ) or return-to-zero (RZ) schemes. In a return-to zero scheme, if a signal uses a positive or negative voltage to represent a binary digit, the voltage must return to zero in the middle of the bit time.

What are the common types of line coding used in communication?

The common types of line encoding are unipolar, polar, bipolar and Manchester encoding. Line codes are used commonly in computer communication networks over short distances. Each of the various line formats has a particular advantage and disadvantage. It is not possible to select one, which will meet all needs.

What is the advantage of Manchester code?

The chief advantage of Manchester encoding is the fact that the signal synchronizes itself. This minimizes the error rate and optimizes reliability. The main disadvantage is the fact that a Manchester-encoded signal requires that more bits be transmitted than those in the original signal.

What is block coding and its purpose?

Block coding refers to the technique of adding extra bits to a digital word in order to improve the reliability of transmission. The word consists of the message bits (often called information, or data) plus code bits. A block code adds bits to existing message bits, or blocks, independently of adjacent blocks 1.

Why do we need scrambling and block coding?

Following are the benefits or advantages of Scrambling: ➨It does not increase data rate unlike block coding technique. ➨It eliminates long string of 0s to provide more transitions in the data. This helps receiver for synchronization to recover the original bit pattern.

Why does scrambling is used in line coding scheme?

Digital to Digital conversion involves three techniques – Line Coding, Block Coding, and Scrambling. Line Coding is always needed, whereas Block Coding and Scrambling may or may not be needed depending upon need. Scrambling is a technique that does not increase the number of bits and does provide synchronization.

What is source coding and channel coding?

Source coding: The source encoder converts information waveforms to bits, while the decoder converts bits back to waveforms. Channel coding: The channel encoder converts bits to signal waveform, while the decoder converts received waveform back to bits.