Frequency recovery apparatus and method for use in digital...

Details Frequency recovery apparatus and method for use in digital... Frequency recovery apparatus and method for use in digital...

2005-09-15

2009-06-23

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S142000, C375S150000, C375S262000, C375S341000, C375S342000

Reexamination Certificate

active

07551692

ABSTRACT:
A frequency recovery device and method, the method including a) dividing first data units and corresponding second data units delayed by time intervals, passing only parts of the data units from among the divided data units in the divided intervals, dividing the first and the second data units into four parts each having a 2k-mode interval size, passing each part and the data units contained in a predetermined-sized pull-in range interval positioned at front and rear parts of the data interval, allowing the remaining data to be padded to zero, and generating the padding result; b) generating pilot patterns in the divided data units; c) performing correlation between the padding results of the first and second data units at individual positions of the generated pilot patterns, and generating correlation values; and d) estimating a maximum correlation value from among the correlation values as a frequency offset.

REFERENCES:
patent: 6628730 (2003-09-01), Stott et al.
patent: 2004/0179625 (2004-09-01), Kim
patent: 2007/0036231 (2007-02-01), Ido
patent: 1346186 (2002-04-01), None
patent: 1 195 961 (2002-04-01), None
Hanzo et al., “Single- and Multi-carrier Quadrature Amplitute Modulation,” pp. 521-534, (2000), XP-002453970.

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