Sync detection circuit and method using variable reference...

H - Electricity – 04 – L

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H04L 7/02 (2006.01) H04L 7/04 (2006.01) H04Q 7/14 (2006.01)

Patent

CA 2203469

In a sync detector, a baseband signal is segmented into a plurality of successive bit sequences so that the bits of each sequence are shifted by one bit position with respect to the bits of adjacent sequences. On a bit-by-bit basis, mismatches are detected between each input bit sequence and a predetermined bit sequence and the detected mismatches are counted to produce a mismatch count. A first comparison is made between the mismatch count and a reference value to determine that a sync code is detected if the mismatch count is equal to or smaller than the reference value, and a further comparison is made between successively produced mismatch counts to determine that a sync code is detected when the later of the successively produced mismatch counts is equal to or smaller than the earlier one. The first comparison is repeated when the later mismatch equals zero.

Dans un détecteur de synchronisation, un signal en bande de base est segmenté en un certain nombre de séquences de bits successives de sorte que les bits de chaque séquence sont décalés d'une position binaire par rapport aux bits des séquences adjacentes. Les non-concordances entre chaque séquence de bits d'entrée et une séquence de bits prédéterminée sont détectées bit par bit puis comptées afin de produire un compte de non-concordances. Une première comparaison est faite entre le compte de non-concordances et une valeur de référence afin de permettre la détection d'un code de synchronisation si le compte de non-concordances est égal ou inférieur à la valeur de référence. Une autre comparaison est faite entre les comptes de non-concordances produits successivement afin de permettre la détection d'un code de synchronisation si chacun des comptes de non-concordances successivement produits est égal ou inférieur au précédent. La première comparaison est répétée lorsque la dernière non-concordance est égale à zéro.

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