Process for transmitting a sequence of information bits with...

Details Process for transmitting a sequence of information bits with... Process for transmitting a sequence of information bits with...

H - Electricity

04

L

H04L 1/00 (2006.01) H03M 13/35 (2006.01) H03M 13/45 (2006.01)

Patent

CA 2189723

Based on the sequence of the information bits to be transmitted, the coder forms a second sequence of bits c n, which includes a redundant subset. A differential coding of the form d n=c n~d f(n) with f(n)<n produces a third sequence of bits d n. The signal sent represents the bits of the third sequence in a specified order. Having obtained likelihood data r n associated with the bits d n, the receiver calculates estimates of the bits c n of the redundant subset as a function of the sign of r n . r f(n). By exploiting the redundancy, the receiver can detect the bits c n of the subset having erroneous estimates, and rectify the sign of the less reliable of the two associated likelihood data items r n and r f(n). The other bits c n' of the second sequence then benefit from additional protection if there is at least one bit c n of the redundant subset such that n' =f(n) or f(n')=n or f(n).

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