Patent ID: 8031803

Claim:
A transmitter capable of suppressing a peak of a transmission signal, comprising: a frequency domain acquisition unit for obtaining a frequency domain signal from the signal for transmission; a level control unit for controlling a level of the frequency domain signal obtained by the frequency domain acquisition unit to suppress a peak in a time domain transmission signal; a time domain conversion unit for converting the frequency domain signal into the time domain transmission signal whose level has been controlled by the level control unit; and a transmission unit for transmitting the time domain transmission signal, wherein the transmitter further comprises a D/A converter for converting the time domain transmission signal converted by the time domain conversion unit from a digital signal to an analog signal, a multiplier for frequency-converting the analog signal, and an amplifier for amplifying the frequency-converted signal by the multiplier, wherein the frequency domain acquisition unit obtains the frequency domain signal from the signal for transmission by converting a time domain data signal corresponding thereto through a multi-stage FFT operation, the time domain acquisition unit converts the frequency domain signal into the time domain transmission signal through a multi-stage IFFT operation, and the level control unit controls the level by adjusting a word length of a target signal at least one of positions located in front of a stage of the FFT operation subsequent to a second stage thereof, or located in front of a stage of the IFFT operation.