Chap#10 (Forouzan) Error Detection and Correction - BZU PAGES: Find Presentations, Reports, Student's Assignments and Daily Discussion; Bahauddin Zakariya University Multan

**.BZU.** · #1 07-04-2008, 11:22 PM

Chapter number 10
Behrouz A Forouzan
Error Detection and Correction

Contents :
Single-Bit Error: In a single-bit error, only one bit in the data unit has changed.
Burst Error: A burst error means that 2 or more bits in the data unit have changed.

Four Methods of Error Detections:

Redundancy
Parity Check
Cyclic Redundancy Check (CRC)
Checksum
Positions of redundancy bits in Hamming code

Error detection uses the concept of redundancy, which means adding extra bits for detecting errors at the destination.

In parity check, a parity bit is added to every data unit so that the total number of 1s is even (or odd for odd-parity).

Simple parity check can detect all single-bit errors. It can detect burst errors only if the total number of errors in each data unit is odd.