Searcher for multiple orthogonal channels with known data...

Details Searcher for multiple orthogonal channels with known data... Searcher for multiple orthogonal channels with known data...

2011-04-26

2011-04-26

Kim, Kevin Y (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S368000

Reexamination Certificate

active

07933316

ABSTRACT:
A circuit and algorithm are disclosed for a step2 search of a three step search of synchronization channels in a W-CDMA system. A mobile terminal of the CDMA system includes an RF downconverter for receiving I and Q signals. A searcher, responsive to the I and Q signals, includes a first correlator for correlating the I and Q signals with a primary synchronization code on a primary synchronization channel, and a second correlator for correlating I and Q signals with a secondary synchronization code on a secondary synchronization channel. The correlated I and Q signals are added for each of the secondary synchronization codes. An energy calculator and a maximum energy detector use the correlated I and Q signals of both the primary and secondary synchronization channels to detect the most likely scrambling code group of secondary synchronization codes.

REFERENCES:
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Partial International Search, PCT/US2008/072701, International Searching Authority, European Patent Office, Dec. 2, 2008.
Wang et al., “Cell Search in W-CDMA,” IEEE Journal on Selected Areas in Communications, Aug. 1, 2000, vol. 18, No. 8, IEEE Service Center, Piscataway, NJ, US, XP011055194.
International Search Report and Written Opinion - PCT/US2008/072701, International.
Search Authority—European Patent Office—Feb. 11, 2009.

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