Method for the rapid synchronisation of a device for receiving scrambled data, using an optimised calculation of a synchronisation value

Device for receiving scrambled data that has been scrambled by at least one periodic scrambling sequence, and organised into time intervals each including at least one bit period called a symbol, wherein the device comprises:

• a synchroniser comprising a calculator, which calculates a value for synchronisation of at least one generator polynomial of said scrambling sequence, by progressing through said sequence by jumps of at least one bit period, and by implementing a matrix calculation of said synchronisation value.

Mobile radiocommunication terminal comprising:

• means for receiving scrambled data by means of at least one periodic scrambling sequence, and organised into time intervals (frames) each including at least one bit period called a symbol
• means for synchronisation of said receiving means including means for calculating a synchronisation value of at least one generator polynomial of said scrambling sequence, by progression through the sequence by jumps of at least one bit period, wherein said calculation means implement a matrix calculation of said synchronisation value.