Patent ID: 6931239
Filing Date: 2005-08-16
Classification: H03G,H04L

Abstract:
1. A peak limiter for use in a system for amplifying a multi-carrier signal, comprising: an instantaneous power detection unit for receiving a baseband signal of each carrier and estimating the multi-carrier signal to provide instantaneous power levels of the estimated multi-carrier signal; an average power detection unit for providing an average power level of the estimated multi-carrier signal; a peak detection unit, responsive to the average power level and the instantaneous power levels, for calculating instantaneous-to-average power ratios, an instantaneous-to-average power ratio being a ratio of an instantaneous power level to the average power level, and comparing the instantaneous-to-average power ratios with a predetermined peak factor threshold value to thereby detect a peak to be peak-limited and provide peak detection information representing the peak; and a limiter unit for limiting an amplitude of the baseband signal in response to the peak detection information to provide peak-limited baseband signals, wherein the estimated multi-carrier signal is obtained by combining baseband signals of carriers after providing the baseband signals with frequency offsets which correspond to differences between carrier frequencies.