Error Detection
 Example: n=2k
 Repeat the frame
 k redundant bits
 Example: Simple Parity Check
 Even Parity
 number of "1" per block is even
 Odd Parity
 number of "1" per block is odd
 Redundancy ratio = k+1/k
 Performance criteria for error detection codes is the probability of an
undetected error,

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