System for transmitting words that are protected by a...

H - Electricity – 03 – M

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H03M 13/00 (2006.01) G06F 11/10 (2006.01) G11B 20/18 (2006.01) H03M 13/23 (2006.01) H03M 13/35 (2006.01)

Patent

CA 1257353

16 Abstract: System for transmitting words that are protected by a combination of a block code and a convolution code, transmitter device for use in such system and receiver device for use in such system. A system is described for transmitting data words composed of more significant bits and less significant bits. The less significant bits of a data word are, by means of matrix multiplication, encoded into a first redundant proto-code word. The more significant bits of a data word are by means of matrix multiplication, and different delays over respective numbers of recurrence times of the arrival of the data words encoded in a set of further redundant proto-code words. A code word is formed by means of modulo-2-addition of code words, so that for the less significant data bits a block code is realized, while for the more significant data bits a convolutional encoding is realized. In the decoding, the more significant bits are decoded by means of Viterbi decoding, while the Viterbi metric is determined from the deviation between the reconstructed contribution from the lower significant bits and the actually received contribution therefrom.

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