Patent ID: 7529316
Filing Date: 2009-05-05
Classification: H04B,H04L

Abstract:
1. A transmitter for transmitting a suppressed transmit signal generated from a transmit signal including a plurality of carrier signals, the transmitter comprising: a peak reduction signal generating means for generating a peak reduction signal, the generated peak reduction signal having (i) a signal level based on a transmit signal level threshold for identifying a peak of the transmit signal and based on a signal level of the peak of the transmit signal, and (ii) a phase based on a phase of the transmit signal; a plurality of peak reduction signal processing means, each of the peak reduction signal processing means subjecting the generated peak reduction signal to a band restriction and an orthogonal modulation by: (A) multiplying, for the plurality of carrier signals of the transmit signal, (i) synthesized carrier transmit signals of the plurality of carrier signals of the transmit signal, and (ii) prescribed coefficient data; and (B) complex-multiplying (i) the result of the multiplying of the synthesized carrier transmit signals and the prescribed coefficient data, and (ii) the generated peak reduction signal, to generate a plurality of complex-multiplied peak reduction signals, each generated complex-multiplied peak reduction signal representing the generated peak reduction signal subjected to the band restriction and the orthogonal modulation; a peak reduction signal processing results synthesizing means for synthesizing the generated complex-multiplied peak reduction signal output from the plurality of peak reduction signal processing means; and a transmit signal level suppressing means for subtracting a result of the synthesizing of the generated complex-multiplied peak reduction signals from the transmit signal to suppress the signal level of the transmit signal, wherein, when a second peak appears during processing of a first peak by a first of the plurality of peak reduction signal processing means, processing of the second peak is conducted by a second of the plurality of peak reduction signal processing means, and wherein, when a third peak appears, processing of the third peak is conducted by a third of the plurality of peak reduction signal processing means.