Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Reexamination Certificate
2005-03-14
2008-08-26
Iiu, Shuwang (Department: 2611)
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
C375S371000, C375S354000, C370S503000, C370S304000
Reexamination Certificate
active
07418070
ABSTRACT:
In a signal generator, a peak value/peak position detection section detects value and position of an amplitude peak observed in modulation data coming from an orthogonal modulation section, and a peak carrier extraction section extracts L subcarriers capable of minimizing such an amplitude peak. A peak carrier generation section generates peak suppression data corresponding to thus extracted subcarriers, and a subtraction section subtracts the peak suppression data from the modulation data. A transmission signal generation section generates an analog transmission signal from the modulation data, and a peak suppression section generates an analog peak suppression signal from the peak suppression data. A signal synthesis section synthesizes the transmission signal and the peak suppression signal, and sends out the synthesis result to a wireless communications line via a transmission antenna. With such a structure, any amplitude peak found in a multicarrier transmission signal can be successfully suppressed.
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Hitachi Kokusai Electric Inc.
Iiu Shuwang
Lam Kenneth
Oliff & Berridge PLLC
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