Apparatus and method for secondary synchronization channel...

Details Apparatus and method for secondary synchronization channel... Apparatus and method for secondary synchronization channel...

2006-08-22

2006-08-22

Tran, Khai (Department: 2637)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C714S784000

Reexamination Certificate

active

07095811

ABSTRACT:
A pipelined cell search apparatus comprises a secondary search stage that receives a secondary synchronization channel (S-SCH) signal. The secondary search stage comprises: 1) a correlation block for i) correlating the S-SCH signal with a 256-bit sequence z to produce a first correlated output sequence and ii) correlating the first correlated output sequence with sixteen Hadamard sequences to produce a vector output sequence, each vector comprising sixteen Hadamard-correlated values, one for each of the sixteen Hadamard sequences; 2) a maximum detection block for detecting a maximum Hadamard-correlated value in the each vector and generating an index sequence, each index identifying a vector position of the maximum Hadamard-correlated value; 3) a Reed-Solomon (R-S) decoding correction block for decoding and correcting 15 consecutive indexes in the index sequence and determining therefrom a codeword of length 3; and 4) a frame-time detector for determining from the codeword of length 3 a frame boundary of the S-SCH signal based on syndrome properties of an R-S code associated with the S-SCH code.

REFERENCES:
patent: 6563436 (2003-05-01), Fimoff et al.
patent: 2002/0057664 (2002-05-01), Sarkar
patent: 2004/0223517 (2004-11-01), Rimi et al.

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