Patent ID: 8891644
Filing Date: 2014-11-18
Classification: H04L

Abstract:
1. A communication apparatus for communicating with another apparatus in orthogonal frequency-division multiplexing wireless communication, the communication apparatus comprising: a modulator that modulates an input signal using a predetermined modulation scheme, and assigns the modulated input signal to subcarriers with frequency components orthogonal to each other, thereby generating a subcarrier modulation signal; a first transformer that performs an inverse fast Fourier transformation on the subcarrier modulation signal; a divider that divides a calculation result by the first transformer into a predetermined number of pieces to generate a plurality pieces of first subdata; a disperser that adds dispersion coefficients, which are complex numbers defined for each first subdata and of which at least one is a complex number other than 0, to values of respective elements of the plurality pieces of first subdata to generate post-dispersion first subdata; a sorter that generates second subdata in which each element of the post-dispersion first subdata is arranged in a position different from a position of the each element in the post-dispersion first subdata, and a value of at least one predetermined element is replaced with 0, and in which combinations of elements in same positions in the post-dispersion first subdata and in the second subdata are different from each other; an operator that divides a value of sum by 2, the value of sum being a sum of a value of an element which is not the predetermined element of which the value is replaced with 0 by the sorter among elements of the second subdata, and a value which is obtained by dividing a value of an element located in a same position in the post-dispersion first subdata as the position of the element which is not the predetermined element by a predetermined amplitude coefficient, and divides a value of an element by 2 in a same position in the post-dispersion first subdata as the position of the predetermined element among the elements of the second subdata, thereby generating post-average first subdata; a corrector that subtracts correction coefficients which are complex numbers defined for each first subdata from values of respective elements of the post-average first subdata to generate post-correction first data; a synthesizer that generates a baseband signal based on synthesized data in which the post-correction first subdata is arranged in positions of the plurality pieces of first subdata when the divider divides the calculation result; and a transmitter that generates a transmission signal from the baseband signal and transmits the transmission signal.