Multiplex communications – Generalized orthogonal or special mathematical techniques – Fourier transform
Reexamination Certificate
2006-01-18
2010-10-05
Cho, Un C (Department: 2617)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Fourier transform
C370S208000, C370S537000, C370S319000, C455S067160, C708S402000, C708S403000, C708S404000, C708S405000, C708S421000, C708S426000
Reexamination Certificate
active
07808886
ABSTRACT:
Methods (500, 800) and corresponding systems (100, 200, 300, 400, 900) for generating a pilot symbol (330) include providing an M-point parallel transform sequence that is a discrete Fourier transform of a CAZAC sequence (312, 504-508). The M-point parallel transform sequence (312) is distributed (316, 510) to a set of M subcarriers among N subcarriers to form an N-point frequency-domain sequence (318) wherein the M subcarriers are evenly spaced apart. An N-point inverse fast Fourier transform (320, 512) is performed to convert the N-point frequency-domain sequence to an N-point time-domain sequence (322). The N-point time-domain sequence is converted (324, 514) to a serial sequence (326), and a cyclic prefix is added (328, 516) to the serial sequence to form a pilot symbol (330).
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Cho Un C
FreeScale Semiconductor, Inc.
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