Error detection and correction in data communication
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Error Detection
Errors in the received frames are detected by means of Parity Check and Cyclic Redundancy Check (CRC). In both cases, few extra bits are sent along with actual data to confirm that bits received at other end are same as they were sent. If the counter-check at receiver’ end fails, the bits are considered corrupted.
Error Correction
In the digital world, error correction can be done in two ways:
Backward Error Correction When the receiver detects an error in the data received, it requests back the sender to retransmit the data unit.
Forward Error Correction When the receiver detects some error in the data received, it executes error-correcting code, which helps it to auto-recover and to correct some kinds of errors.
Errors in the received frames are detected by means of Parity Check and Cyclic Redundancy Check (CRC). In both cases, few extra bits are sent along with actual data to confirm that bits received at other end are same as they were sent. If the counter-check at receiver’ end fails, the bits are considered corrupted.
Error Correction
In the digital world, error correction can be done in two ways:
Backward Error Correction When the receiver detects an error in the data received, it requests back the sender to retransmit the data unit.
Forward Error Correction When the receiver detects some error in the data received, it executes error-correcting code, which helps it to auto-recover and to correct some kinds of errors.
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