DCOM PRACTICAL-LBC

 


                                                                                     

 Name of Experiment :-Implementation of Linear Block Code Using MATLAB

Linear Block Codes

In the linear block codes, the parity bits and message bits have a linear combination, which means that the resultant code word is the linear combination of any two code words.

Let us consider some blocks of data, which contains k bits in each block. These bits are mapped with the blocks which has n bits in each block. Here n is greater than k. The transmitter adds redundant bits which are bits. The ratio k/n is the code rate. It is denoted by r and the value of r is r < 1.

The  bits added here, are parity bits. Parity bits help in error detection and error correction, and also in locating the data. In the data being transmitted, the left most bits of the code word correspond to the message bits, and the right most bits of the code word correspond to the parity bits.

Systematic Code

Any linear block code can be a systematic code, until it is altered. Hence, an unaltered block code is called as a systematic code.

Following is the representation of the structure of code word, according to their allocation.

Systematic Code

If the message is not altered, then it is called as systematic code. It means, the encryption of the data should not change the data.



 
           PRE TEST 
                                                                      THEORY                         PRACTICAL

 
                                                                                                                                POST TEST


Reference:- 
























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