Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2007-12-11
2007-12-11
Kim, Kevin (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
C375S147000
Reexamination Certificate
active
11592286
ABSTRACT:
Iterative data-aided carrier CFO estimation for CDMA systems. Any communication receiver may be adapted to perform the iterative data-aided carrier CFO estimation. The iterative data-aided carrier CFO estimation is performed using a high accuracy method. The operation may be described as follows: a received signal is despread and buffered. Using the received preamble sequence, an initial estimate of the CFO is obtained. This estimate is used to correct the whole despread data. The corrected data using the initial CFO estimate is sliced. Each despread data symbol is divided by the corresponding sliced data decision. The obtained sequence is then averaged across different codes to obtain a less noisy sequence, which is then used to estimate the CFO again. The procedure can be repeated (iterated) to obtain a more accurate carrier frequency offset estimate; the number of times in which the procedure is repeated may be programmable or predetermined.
REFERENCES:
patent: 2002/0159540 (2002-10-01), Chiodini
patent: 2003/0058966 (2003-03-01), Gilbert et al.
Ma Jun
Min Jonathan S.
Yousef Nabil R.
Broadcom Corporation
Garlick & Harrison & Markison
Kim Kevin
Short Shayne X.
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