Initial synchronization method and receiver for DS-CDMA inter base station asynchronous cellular system
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United States of America Patent
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Mar 14, 2000
Grant Date -
N/A
app pub date -
Jan 6, 1998
filing date -
Jan 7, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Cells are searched at a high speed using an initial synchronization method and a receiver for a DS-CDMA inter base station asynchronous cellular system. A base band received signal is input to a matched filter and is correlated with a spread code supplied from a spread code generator. A signal electric power calculator calculates the electric power of the correlation output of the matched filter, and outputs the result to a long code synchronization timing determiner, a threshold value calculator, and a long code identifier. During the initial cell search, the spread code generator outputs a short code #0 that is common to the control channel of each of the base stations. After the long code synchronization timing has been determined, each of the segments of the N chips which constitutes a portion of the synthesized spread code sequence synthesized from a long code #i that is unique to each of the base stations and the short code #0 is sequentially replaced and output.
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