Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2007-08-07
2007-08-07
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S332000, C375S344000
Reexamination Certificate
active
10258626
ABSTRACT:
A system and method for estimating the frequency offset experienced between carrier and local oscillator frequencies in communication systems using quadrature modulation. The invention exploits the geometry of the quadrature modulation constellation and estimates actual offset within a predefined carrier offset value without requiring data estimation.
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patent: 6728326 (2004-04-01), Fulghum
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Cowley et al., “Estimation of Frequency Offset in Mobile Satellite Modems”, International Mobile Satellite Conference, Jun. 16-18, 1993, pp. 417-422.
Franks, “Carrier and Bit Synchronization in Data Communication A Tutorial Review”, IEEE Transactions on Communications, US, IEEE Inc. New York, vol. COM-28, No. 8, Aug. 1, 1980, pp. 1107-1121.
Ahmed et al., “A Method for Coarse Frequency Acquisition for Nyquist Filtered MPSK”, IEEE Transactions on Vehicular Technology, vol. 5, No. 4, Nov. 1, 1996, pp. 720-731.
Schilling et al., “Principals of Communication Systems”, 1986, McGraw-Hill, New York, pp. 264, line 13; p. 265, line 37; figure 6.5.5, p. 275; line 1, p. 276; line 3; figure 6.7.3.
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Kazakevich Leonid
Ozluturk Fatih
Reznik Alexander
InterDigital Technology Corporation
Volpe and Koenig P.C.
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