Pulse or digital communications – Synchronizers
Reexamination Certificate
2001-03-13
2009-06-09
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Synchronizers
C375S145000, C375S149000
Reexamination Certificate
active
07545895
ABSTRACT:
Two preferred embodiments provide slot synchronization of an initial cell search. Two Finite Impulse Response (FIR) filters are used to correlate the synchronization codes transmitted in the downlink (forward link). A sign bit is taken after the first FIR to significantly reduce the hardware requirements for the second FIR, and thus the whole system. The correlated results from the second FIR can be further processed using two different algorithms. The first adds a square operation to the correlated results whilst the second takes the magnitude before passing to the next stage. Regardless of which algorithm is adopted, the results are accumulated (I and Q), instead of averaged, and stored in a memory location for each successive correlation over the same location in different slots. The physical-layer processor (PLP) then reads the accumulated results from the memory location and searches for the peak position corresponding to the slot boundary.
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“Generalised Hierarchical Golay Sequence for PSC with low complexity correlation using pruned efficient Golay correlators,” TSG-RAN Working Group 1, Meeting No. 5, Jun. 1-4, 1999, Cheju, Korea, pp. 1-6.
Lo, F.L. et al., “Fast Cell Search During PN Code Phase Acquisition Using Adaptive Filters in AWGN Environment,” 1999 IEEE Global Telecommunications Conference, Rio De Janeiro, Brazil, Dec. 5-9, 1999, pp. 452-456.
Wang, Y-P E., et al., “Cell Search Algorithms and Optimization in W-CDMA,” 2000 IEEE 51st Vehicular Technology Conference Proceedings, Tokyo, Japan, May 15-18, 2000, pp. 81-86.
Aldridge Christopher
Oh Ser Wah
Carlson David V.
Huang David
Jorgenson Lisa K.
Liu Shuwang
STMicroelectronics Asia Pacific (Pte) Ltd.
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