H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 13/00 (2006.01) H03M 7/00 (2006.01)
Patent
CA 2136039
A method and apparatus for increasing the coding efficiency of a digital data transmission system from k/n to (k+1)/n by truncating a check bit from a generated checkword and adding an extra information bit prior to transmission. The encoding algorithm at the receiver borrows the added information bit to replace the truncated check bit in order to perform error detection and correction n the entire codeword. If an error is detected at the shared bit position, the shared bit is not corrected by the decoding circuit since a detected error in that position is more likely a result of bit inversion due to replacement than due to a transmission fault. The coding efficiency of the transmission system is increased from k/n to (k+1)/n while the number of bit errors correctable by the system is only reduced to, on the average, t-(1/2) for some range of BER's.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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