Patent ID: 8744002
Filing Date: 2014-06-03
Classification: H04B,H04L

Abstract:
1. A peak power suppressing circuit that performs a clipping process on an IQ (In-phase and Quadrature-phase) baseband signal, comprising: a power calculation section that calculates an instantaneous power of the IQ baseband signal; a pulse retention section that retains a cancellation pulse that has a frequency component in a frequency band of the IQ baseband signal and a frequency component outside the frequency band; and a clipping processing section that subtracts, from the IQ baseband signal whose instantaneous power that has been calculated is greater than a predetermined threshold, a cancellation signal obtained by multiplying an increment of the IQ baseband signal from the threshold by the cancellation pulse, wherein the cancellation pulse is a synthesized pulse obtained by synthesizing a basic pulse which has a frequency component in the frequency band, and an auxiliary pulse which has a frequency component outside the frequency band that precipitously rises in a time period when the basic pulse peaks, the auxiliary pulse having a narrower pulse width and a lower peak level than the basic pulse.