Patent ID: 7630291

Claim:
A transmitter apparatus, comprising a serial-parallel converter, a unitary matrix modulator, a splitter, an inverse Fourier transform unit, a parallel-serial converter, and a transmission unit, wherein: said serial-parallel converter receives an input of a signal to be transmitted, and serial-parallel-converts the signal to output m (m≧2) number of intermediate signals; said unitary matrix modulator modulates the output m number of intermediate signals into a unitary matrix having m rows and m columns whose components other than whose diagonal components are 0, and outputs the obtained matrix; said splitter supplies the respective diagonal components of the output matrix to input channels of said inverse Fourier transform unit as input signals; said inverse Fourier transform unit outputs m number of inverse-Fourier-transformed signals obtained by performing inverse Fourier transform of the input signals supplied to the input channels; said parallel-serial converter parallel-serial-converts the output m number of inverse-Fourier-transformed signals to output one transmission signal; and said transmission unit transmits the output transmission signal, and wherein a difference between frequencies of any two of the channels of said inverse Fourier transform unit is equal to or larger than a predetermined coherent bandwidth.