METHOD FOR REDUCING PAPR OF OFDM SIGNAL AND OFDM TRANSMITTER USING THE SAME BACKGROUND

摘要

A method for reducing a PAPR of an OFDM signal and an OFDM transmitter using the same are disclosed. In an OFDM transmitter, a signal processing circuit for reducing a PAPR of a modulated signal includes: a peak detector configured to detect peaks having sizes above a threshold value from an IQ baseband signal of the modulated signal and to output information on a position, a size and a phase; a memory configured to store a reference peak in time domain; a peak generator configured to generate an inverse peak signal for canceling a part of an amplitude of the IQ baseband signal from the reference peak based on the information on the position, the size and the phase; and a signal processing unit configured to add the inverse peak signal to the IQ baseband signal to constrain the amplitude of the IQ baseband signal.

主权项

1. A signal processing circuit, in an OFDM transmitter, for reducing a peak-to-average power ratio (PAPR) of a modulated signal, the signal processing circuit comprising:
a peak detector configured to detect peaks having sizes above a threshold value from an IQ baseband signal of the modulated signal and to output information on a position, a size and a phase of each of the peaks; a memory configured to store a reference peak in time domain, the reference peak indicating a peak of a maximum size that is removable in the OFDM transmitter; a peak generator configured to generate an inverse peak signal for canceling a part of an amplitude of the IQ baseband signal from the reference peak based on the information on the position, the size and the phase of each of the detected peaks; and a signal processing unit configured to add the inverse peak signal to the IQ baseband signal to constrain the amplitude of the IQ baseband signal.