Two Dimensional (2-D) Parity Check

Two Dimensional Parity Check is also known as Longitudinal Redundancy Check (LRC). It is the improved version of single parity bit.

According to 2-D Parity Check

  • All sending data is placed in forms of rows and columns.
  • For even Parity, bits are calculated of each column and redundant bits is attach with that column.
  • Block of parity bits of each column acts as redundant bits.

LRC-Example

Find the LRC for the sending data blocks 11100111  11011101  00111001 10101001 and determine the data that is transmitted?

Solution:

Step 01: First generate LRC bits as given below

Step 02: Now attach LRC with original data and transmit to sender. Block diagram of LRC is given below

Performance of 2-D Parity Check

  • It can detect the burst errors.
  • If two bits are changed in exactly the same column then errors cannot detected.

 

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