Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1997-03-25
1999-09-28
Bocure, Tesfaldet
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
H04L 700
Patent
active
059600489
ABSTRACT:
The invention relates to synchronizing in communication systems by using a sequential correlation technique. A digital sequence known to the receiver, a so-called signature, is allocated a plurality of segments. The segments are correlated, segment for segment, in a correlator (300) which is equally as long as the segment. The segments may have the same or different bit patterns. When a first segment is received in the correlator (300) and the correlation value of this segment exceeds an associated threshold value, the segment is accepted as received and is saved in a memory (308) in response to a signal from the control unit (311). A timer (319) is set to a time point that corresponds to the length of the segments. There is then correlated a second segment whose correlation value on the signal from the timer (319) is added (304) to the value stored in the memory (308). If the sum exceeds an associated threshold value, the sum is stored in the memory (308). Detection continues in this way. When the sum of the correlation values of all segments have exceeded the threshold value of the last segment, there is generated a sync. time pulse signal (Ts). Should a threshold value not be exceeded, it is assumed that a wrong signature has been received, and detection of the first segment is recommenced.
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International-Type Search Report re: SE 96/00324 Date of mailing of report: Oct. 4, 1996.
Weihua Zhuang, "An Improved Hybrid PN Code Acquisition for CDMA Personal Wireless Communications", PIMRC Conference held Sep. 1995, pp. 995-999.
Bocure Tesfaldet
Telefonaktiebolaget LM Ericsson
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