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US 6,363,060 B1Granted
Method and apparatus for fast WCDMA acquisition
AssigneeQUALCOMM Incorporated
InventorSandip Sarkar
Life of this patent
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Abstract
A method and apparatus for quickly acquiring synchronization of a signal in a WCDMA communication system utilizing variable duration sample accumulation, validity testing of decoder estimates, and parallel decoding of multiple synchronization signals within a PERCH channel. The receiver accumulates the samples necessary to reliably determine slot timing. Until slot timing estimates pass a validity test, samples are accumulated for frame timing estimates. Until frame timing estimates pass a validity test, samples are analyzed to determine the pilot offset of the channel.
Claims23
A method of receiving a signal comprising the steps of:
- a) clearing a primary synchronization code (PSC) sample accumulation buffer and a secondary synchronization code (SSC) sample accumulation buffer by setting their stored values to zero;
- b) accumulating a first set of received samples into said PSC sample accumulation buffer to form a set of PSC accumulation values;
- c) forming a first slot timing estimate based on the contents of said PSC sample accumulation buffer;
- d) accumulating a second set of received samples into said SSC sample accumulation buffer to form a set of SSC accumulation values based on said first slot timing estimate;
- e) accumulating said second set of received samples into said PSC sample accumulation buffer;
- f) performing a test to determine the validity of said first slot timing estimate;
- g) performing a first SSC decoding based on the contents of said SSC sample accumulation buffer, and based on a first slot timing estimate found valid by said test, to generate a set of SSC code symbols;
- and
- h) performing a second SSC decoding based on said SSC code symbols to generate an SSC code word.
6 more elements
Dependencies are inferred from the claim text.