| 主权项 |
1. A communication device that communicates with another device in orthogonal frequency-division multiplexing wireless communication, the communication device comprising:
a modulator that modulates input signals by a predetermined modulation scheme to generate primary modulation signals and generates subcarrier modulation signals that are parallel signals based on the primary modulation signals; a combiner that arranges the subcarrier modulation signals in order thereby to generate a compound matrix having each of the subcarrier modulation signals in each column thereof; a shifter that shifts elements of each row of the compound matrix in a predetermined direction by a number of shifts of a shift unit to which the each row belongs, based on a number of shifts set for each shift unit of a plurality of shift units, the each shift unit comprising a same number of rows in the compound matrix thereby to generate a shift matrix; a first IFFT calculator that subjects the shift matrix to inverse fast Fourier transformation to generate an inverse transformation matrix; a maximum detector that calculates a peak-to-average power ratio of a baseband signal generated for each of columns of the inverse transformation matrix and detects a column with a highest peak-to-average power ratio among the columns of the inverse transformation matrix; a repeater that repeats processing by the shifter, the first IFFT calculator and the maximum detector while changing the number of shifts of at least any one of the plurality of shift units; a minimum detector that detects an inverse transformation matrix including a column with a lowest peak-to-average power ratio among columns detected by the maximum detector; and a transmitter that combines elements of each column of the inverse transformation matrix detected by the minimum detector to generate baseband signals and transmits a transmission signal based on the baseband signals. |
