Problem
A. The received 7 × 5 message block shown below uses odd parity checks, with the parity bits displayed at the end of each row (A-E) and column (1-7) in the shaded cells (see Section 3.7.1). A single bit error has occurred somewhere in this message block. By checking each row and column, determine the following:
a. The row-column grid reference of the bit error.
b. What change needs to be made to correct the error?
As part of your answer, briefly explain how you located the bit error.
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1
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2
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3
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4
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5
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6
|
7
|
|
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A
|
1
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1
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1
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1
|
0
|
1
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0
|
0
|
|
B
|
1
|
1
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0
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1
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0
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0
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0
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0
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C
|
1
|
0
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1
|
1
|
0
|
1
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0
|
1
|
|
D
|
1
|
0
|
0
|
0
|
1
|
0
|
1
|
0
|
|
E
|
1
|
0
|
1
|
0
|
1
|
1
|
1
|
1
|
|
0
|
1
|
0
|
1
|
1
|
0
|
1
|
1
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