Frame-Synchronization Method and Device
AssigneeFrance Telecom
InventorsSebastien Houcke, Guillaume Sicot
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Abstract
A frame synchronization method and device. The method determines the frame start position D. That position D is the same as a position of a window H sliding along the received frame Tr. For various possible positions of the window H and for various blocks Bi of the window H, the method computes a syndrome Sd(i), and the start position D of the received frame Ti is that for which the number of null elements of a syndrome Sd(i) is highest.
Claims11
A method of synchronizing frames of data constituting code words by means of a window H sliding over a received frame Tr of size Knc, divided into K blocks Bi of size nc the same as that of a code word, wherein the method comprises determining a start position D of the received frame Tr that is one of several possible positions of the sliding window H along the received frame Tr such that, for various possible positions of the window H, computing a syndrome Sd(i) (i) for each block Bi, a syndrome consisting of elements, and determining for each syndrome Sd(i) (i) the number of null elements, the start position D of the received frame Tr being that for which the number of null elements of the syndromes Sd(i) computed for that position is the highest.
A device (1) for synchronizing frames of data constituting code words to determine a frame start position, comprises:
- windowing means (2) sliding over a received frame Tr of size Knc divided into K blocks Bi of size nc the same as that of a code word, the starting position D of the received frame Tr being the same as one of a plurality of possible positions of the sliding windowing means (2) along the received frame Tr;
- means (3) for computing a syndrome Sd(i) made up of elements for various possible positions of the windowing means (2) and for various blocks Bi of the windowing means (2), the computation means (3) determining a number of null elements of the syndrome Sd(i);
- and
- means (4) for determining a position for which the number of null elements of the syndromes Sd(i) computed for that position is the highest, the starting position D of the frame being the same as that position.
A digital signal intended to be used in an electronic device for synchronizing data constituting code words by means of a window H sliding over a received frame Tr of size Knc divided into K blocks Bi of size nc equal to that of a code word, determining a start position D of the received frame, this frame start position D being the same as one of several possible positions of the sliding window H along the received frame Tr, the digital signal including codes for execution by the electronic device of the following step:
- for various possible positions of the window H and for various blocks Bi of the window H, the electronic device computes a syndrome Sd(i) made up of elements and determines for each syndrome Sd(i) the number of null elements of the syndrome Sd(i), the start position D of the received frame Tr being that for which the number of null elements of a syndrome Sd(i) is the highest.
Dependencies are inferred from the claim text.