Patent ID: 8767852
Filing Date: 2014-07-01
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 by 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 synthesizer that generates a baseband signal from the subcarrier modulation signal using a predetermined transformation matrix to modulate the subcarrier modulation signal with the subcarriers, the predetermined transformation matrix being a non-singular matrix with predetermined elements of 0; and a transmitter that generates a transmission signal from the baseband signal, and transmits the transmission signal; wherein the transformation matrix is a matrix in which elements other than elements of a plurality of square matrices diagonally positioned in the transformation matrix are 0, a sum of numbers of rows and a sum of numbers of columns of the plurality of square matrices coincide with a number of rows and a number of columns of the transformation matrix, and each element of each of the square matrices has a value obtained by multiplying each element in a matrix having a same size as that of the each square matrix and indicating inverse discrete Fourier transformation by a complex trigonometric function having, as a phase, a value determined for each of the square matrices but with an inverted sign.