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US Patent 8744002 Peak power suppressing circuit and communication device having the same

Patent 8744002 was granted and assigned to Sumitomo Electric Industries on June, 2014 by the United States Patent and Trademark Office.

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Patent
Patent
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Patent attributes

Current Assignee
Sumitomo Electric Industries
Sumitomo Electric Industries
1
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
87440021
Patent Inventor Names
Takashi Maehata1
Mikhail Illarionov1
Date of Patent
June 3, 2014
1
Patent Application Number
135750091
Date Filed
November 15, 2010
1
Patent Citations Received
‌
US Patent 11996872 Power tracker for multiple transmit signals sent simultaneously
2
Patent Primary Examiner
‌
Chieh M. Fan
1
Patent abstract

A peak power suppressing circuit can suppress a peak power of an IQ (In-phase and Quadrature-phase) baseband signal more assuredly. In particular, the peak power suppressing circuit performs a clipping process on an IQ baseband signal. The suppressing circuit includes a power calculation section that calculates an instantaneous power P of an IQ baseband signal, a pulse retention section that retains a cancellation pulse S that has a frequency component in a frequency band B of the IQ baseband signal and a frequency component outside the frequency band, and a clipping processing section that subtracts, from an IQ baseband signal whose instantaneous power P that has been calculated is greater than a predetermined threshold Pth, cancellation signals Ic and Qc obtained by multiplying increments ΔI and ΔQ of the IQ baseband signal from the threshold Pth by the cancellation pulse S.

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