Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2011-08-09
2011-08-09
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
Reexamination Certificate
active
07995680
ABSTRACT:
This invention provides an apparatus and method for preamble detection and integer carrier frequency offset estimation, which method comprises the steps of: determining the window of useful subcarriers in preamble transformed to frequency domain based on pre-determined possible integer carrier frequency offset and the length of the preamble, so as to select the useful subcarriers; extracting a plurality of subcarrier sequences having a length equal to that of the preamble from the useful subcarriers; calculating conjugative multiplications of each subcarrier and its neighboring subcarriers in the subcarrier sequences extracted; acquiring the real part of the conjugative multiplications; calculating the cross correlations between the real part of the conjugative multiplications and known preambles modulated by DBPSK, and outputting the calculated correlation values; and detecting preamble index of a target base station with the calculated correlation values to select a target cell, and estimating integer carrier frequency offset with respect to the target base station.
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patent: 2005/0185743 (2005-08-01), Li
patent: 2006/0034227 (2006-02-01), Mudulodu et al.
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Hayashi Hiroyuki
Nakamura Michiharu
Nakaya Yuuta
Suzuki Syuusaku
Wang Xin
Fujitsu Limited
Katten Muchin & Rosenman LLP
Liu Shuwang
Neff Michael
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