US Patent 7873116 Transmitter

A transmitter is provided which effectively reduces a peak that occurs in transmitting signal electric power. A baseband limiter applies a peak reduction process to digital signals on a plurality of carriers in a baseband. A band limiting filter applies a band limitation process to the digital signal on each of the carriers to which the peak reduction process is applied. Quadrature modulation processing is applied to the digital signal on each of the carriers to which the band limitation process is applied. The digital signals on the carriers to which the quadrature modulation process is applied are added. An intermediate frequency limiter multiplies a signal of the added result by a window function that is weighted depending on the magnitude of the detected peak, and applies a peak reduction process thereto.