Apparatus and method for recovering a time-varying signal...

H - Electricity – 04 – J

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H04J 3/06 (2006.01) H04B 1/18 (2006.01) H04L 7/00 (2006.01) H04L 7/04 (2006.01)

Patent

CA 2097058

The present invention presents an apparatus and method for recovering symbols in a data packet (101) transmitted to a re- ceiver from a remote signal source (204) in a time-varying channel using multiple sampling points. In a digital cellular radiotele- phone TDMA system, the receiver (202) performs a complex correlation on the desired slot sync word (DSSW) and the coded di- gital verification color code (CDVCC) in the data packet (101), and on the adjacent slot sync word (ASSW) in an adjacent data packet (102) to produce a first, second and third optimum sampling point, respectively. The data packet (101) is divided into four regions (A, B, C and D). The symbols in each region (A, B, C and D) are serially recovered using one or more of the multiple sampling points depending on the quality of the sampling point adjacent to each region (A, B, C and D).

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