| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a multiplex transmission apparatus adopting digital processing capable of reducing a chip size and to provide a multiplex transmission method. <P>SOLUTION: In the multiplex communication apparatus including a data multiplex processing section or a data multiplex processing section and a demultiplex processing section, the multiplex processing section comprises a pre-stage IFFT circuits 202 for carrying out waveform shaping by inverse fast Fourier transform centering on an information bit of data and a post-stage IFFT circuit 203 for applying inverse fast Fourier transform to outputs of the pre-stage IFFT circuits 202 and thereafter interpolating the result of inverse fast Fourier transform to carry out waveform composite, and the demultiplex processing section comprises a window function multiplication and convolution integration circuit 232 for multiplying a time response waveform of a reception Nyquist filter with a received signal as a window function and executing convolution integral, and a fast Fourier transform circuit 233 for applying fast Fourier transform to an output of the window function multiplication and convolution integration circuit 232 to obtain frequency axis information. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
