Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2007-09-11
2007-09-11
Burd, Kevin (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
C375S147000
Reexamination Certificate
active
10332538
ABSTRACT:
A complex symbol sequence (13), which is a product of an orthogonally detected complex demodulated symbol sequence (1) and a conjugate complex number of a known symbol sequence (2), is applied to phase rotating units (4a,4b,4c) which change the phase of the complex symbol sequence (13) based on frequency offsets (fa, fb, fc). N-symbol adders (5a,5b,5c) each add N symbol values supplied from the phase rotating units (4a,4b,4c), while M-power adders (6a,6b,6c) each calculate the power of a value supplied from the N-symbol adders (5a,5b,5c), and add the power M times. A frequency offset control unit (7) controls frequency offsets applied to the phase rotating units (4a,4b,4c) based on three power sums supplied from the M-power adders (6a,6b,6c), and delivers a power offset estimate (8).
REFERENCES:
patent: 6353642 (2002-03-01), Asahara et al.
patent: 6522696 (2003-02-01), Mobin et al.
patent: 04-35113 (1992-12-01), None
patent: 05-508989 (1993-12-01), None
patent: 8-213933 (1996-08-01), None
patent: 9-8765 (1997-01-01), None
patent: 9-200081 (1997-07-01), None
patent: 2705613 (1997-10-01), None
“A Method of High Precision Frequency Detection with FFT” by Makoto Tabei, et. al., May 1987, vol. J 70-A No. 5 pp. 798-805.
“Performance of AFC Scheme Based on Half-Symbol Differential Detection” by Kazuo Tanada, et. al., Technical Report of IEICE, Jun. 1996, pp. 1-6.
“Frequency Offset Estimation Schemes Under Wide-Spread Time-Dispersive Channels” by Shuichi Hayashi, et. al., Technical Report of IEICE, Sep. 9, 1998, pp. 13-18.
3rd Generation Partnership Project(3GPP™), 3rd Generation Partnership Project; Technical Specification Group Radio Acess Network; Physical channels and mapping of transport channels onto physical channels (FDD), 1999, Valbonne, France, http://www.3gpp.org.
Burd Kevin
Dickstein , Shapiro, LLP.
NEC Corporation
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