Nokia Corporation

Harald Kafemann

Markus Schetelig

The present invention relates to a method and a device for data extraction from a data stream containing at least one data packet. First, comparing a bit stream derived from a received digital data stream with an expected bit sequence is performed by packet detector to determine a correlation value (CorrVal) for detecting a data packet. Then, a data extraction unit is started for data extraction when the correlation value (CorrVal) exceeds a threshold value (CorrThres) indicating that a data packet has been detected. Therefore, comparing the received bit stream with the expected bit sequence to determine a new correlation value (CorrVal) is continued by the packet detector. Finally, restarting data extraction is initiated by a sync-control module when the new correlation value (CorrVal) exceeds the form correlation value (MaxCorrVal).

Method and a device for controlling data extraction from a data stream containing at lease one data packet

The invention relates to a method and a device for identifying a data packet in a data stream, in which by means of a d.c. voltage quota determining circuit () the d.c. voltage quota (dc) for a demodulated digital input signal (S) is calculated, in which a k-bit word is allocated to the input signal (S), in that for each symbol of the input signal (S) corresponding to a bit a bit value (1 or 0) is determined by a decoding circuit () as a function of the d.c. voltage quota (dc), in which the k-bit word corresponding to the input signal (S) is compared by a comparison and correlation calculating circuit () with an expected k-bit synchronization word in order to determine a correlation value (c) and in which a packet identification signal (Pd) is generated by a correlation value comparison circuit () if the correlation value (c) is greater than a correlation threshold value (c). Calculation of the d.c. voltage quota (dc) is therein repeated continually at least until a packet identification signal (Pd) indicates that a data packet is being received.

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Haltern, Germany

Harald Kafemann