Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Reexamination Certificate
2005-05-03
2005-05-03
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
30
Reexamination Certificate
active
06888393
ABSTRACT:
A peak level of amplitude of transmission signals in a multi-carrier communication system or the like is to be effectively suppressed. A transmission data generating unit generates digital transmission data from original data by an OFDM system. A limiter of a peak suppressing unit limits a level of transmission data using thresholds. A subtractor subtracts output data of the limiter from the transmission data to generate differential data. A subtractor suppresses the peak level by subtracting the differential data from transmission data whose timing is coordinated by delay units. A transmitter unit converts the transmission data whose peak level is suppressed into analog transmission signals, further converts their frequency, amplifies their power, and transmits the frequency-converted and power-amplified signals to a radio line via an antenna.
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Nikkei Electronics, Apr. 8, 2002, pp. 102-127 (in Japanese).
Hitachi Kokusai Electric Inc.
Le Dinh T.
Oliff & Berridg,e PLC
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