10.2 ERROR DETECTION AND CORRECTION

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10.2 ERROR DETECTION AND CORRECTION

The source coding techniques are used to reduce the redundancy in the signal. Because the transmission medium introduces errors, we need to devise methods so that the receiver can either detect the errors or correct the errors. To achieve this, error detection techniques and error correction techniques are used. These techniques increase the bandwidth requirement, but they provide reliable communication. Error detection is done through CRC and error correction through FEC.

Because the communication channel introduces errors in the bit stream, error detection techniques need to be incorporated. If errors are detected, the receiver can ask for retransmission. If retransmissions have to be reduced, error correction techniques need to be incorporated.

Note 

In voice and video communications, a higher bit error rate can be tolerated. Even if there is one error in 10,000 bits, there will not be perceptible difference in voice/video quality. However, for data applications, a very reliable data transfer is a must.

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