Method and apparatus for transmitting orthogonal-multi-carrier signal

An apparatus for transmitting an orthogonal-multi-carrier signal, comprising:

• first means for subjecting a multi-channel information signal to first inverse discrete Fourier transform to convert the multi-channel information signal into an orthogonal-multi-carrier signal;
• second means for outputting the orthogonal-multi-carrier signal generated by the first means to a transmission line;
• third means for receiving the orthogonal-multi-carrier signal from the transmission line;
• fourth means for subjecting the orthogonal-multi-carrier signal received by the third means to discrete Fourier transform to recover the multi-channel information signal from the received orthogonal-multi-carrier signal;
• a plurality of fifth means contained in the first means for subjecting the multi-channel information signal to M-point inverse discrete Fourier transforms and thereby implementing a first stage of the first inverse discrete Fourier transform, and for generating transform result signals representative of results of the M-point inverse discrete Fourier transforms, wherein M denotes a predetermined natural number greater than 2;
• and
• sixth means contained in the first means for subjecting the transform result signals generated by the fifth means to N-point inverse discrete Fourier transform and thereby implementing a second stage of the first inverse discrete Fourier transform to generate the orthogonal-multi-carrier signal, the second stage following the first stage, wherein N denotes a predetermined natural number greater than twice M.

An apparatus for transmitting an orthogonal-multi-carrier signal, comprising:

• first means for subjecting an information signal to first inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• second means for outputting the orthogonal-multi-carrier signal generated by the first means to a transmission line;
• third means for receiving the orthogonal-multi-carrier signal from the transmission line;
• fourth means for subjecting the orthogonal-multi-carrier signal received by the third means to discrete Fourier transform to recover the information signal from the received orthogonal-multi-carrier signal;
• fifth means contained in the first means for subjecting the information signal to M-point inverse discrete Fourier transform responsive to rotation factors depending on a desired transmission channel and thereby implementing a first stage of the first inverse discrete Fourier transform, and for generating a transform result signal representative of results of the M-point inverse discrete Fourier transform, wherein M denotes a predetermined natural number greater than 2;
• and
• sixth means contained in the first means for subjecting the transform result signal generated by the fifth means to N-point inverse discrete Fourier transform and thereby implementing a second stage of the first inverse discrete Fourier transform to generate the orthogonal-multi-carrier signal, the second stage following the first stage, wherein N denotes a predetermined natural number greater than twice M.

An apparatus for transmitting an orthogonal-multi-carrier signal, comprising:

• first means for subjecting an information signal to first inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• second means for outputting the orthogonal-multi-carrier signal generated by the first means to a transmission line;
• third means for receiving the orthogonal-multi-carrier signal from the transmission line;
• fourth means for subjecting the orthogonal-multi-carrier signal received by the third means to discrete Fourier transform to recover the information signal from the received orthogonal-multi-carrier signal;
• fifth means contained in the first means for subjecting the information signal to M-point inverse discrete Fourier transform and thereby implementing a first stage of the first inverse discrete Fourier transform, and for generating a transform result signal representative of results of the M-point inverse discrete Fourier transform, wherein M denotes a predetermined natural number greater than 2;
• and
• sixth means contained in the first means for feeding the transform result signal from the fifth means to input terminals of N-point inverse discrete Fourier transform and subjecting the transform result signal to the N-point inverse discrete Fourier transform, and thereby implementing a second stage of the first inverse discrete Fourier transform to generate the orthogonal-multi-carrier signal, the second stage following the first stage, the input terminals depending on a desired transmission channel, wherein N denotes a predetermined natural number greater than twice M.

A method of transmitting an orthogonal-multi-carrier signal, comprising the steps of:

• subjecting an information signal to first inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• outputting the orthogonal-multi-carrier signal to a transmission line;
• receiving the orthogonal-multi-carrier signal from the transmission line;
• and
• subjecting the received orthogonal-multi-carrier signal to discrete Fourier transform to recover the information signal from the received orthogonal-multi-carrier signal;
• wherein the subjecting step comprises:
• 1) subjecting the information signal to M-point inverse discrete Fourier transform and thereby implementing a first stage of the first inverse discrete Fourier transform, and generating a transform result signal representative of results of the M-point inverse discrete Fourier transform, wherein M denotes a predetermined natural number greater than 2;
• and
• 2) subjecting the transform result signal to N-point inverse discrete Fourier transform and thereby implementing a second stage of the first inverse discrete Fourier transform to generate the orthogonal-multi-carrier signal, the second stage following the first stage, wherein N denotes a predetermined natural number greater than twice M.

A method of transmitting an orthogonal-multi-carrier signal, comprising the steps of:

• subjecting an information signal to first inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• outputting the orthogonal-multi-carrier signal to a transmission line;
• receiving the orthogonal-multi-carrier signal from the transmission line;
• and
• subjecting the received orthogonal-multi-carrier signal to discrete Fourier transform to recover the information signal from the received orthogonal-multi-carrier signal;
• wherein the subjecting step comprises:
• 1) subjecting the information signal to M-point inverse discrete Fourier transform responsive to rotation factors depending on a desired transmission channel and thereby implementing a first stage of the first inverse discrete Fourier transform, and generating a transform result signal representative of results of the M-point inverse discrete Fourier transform, wherein M denotes a predetermined natural number greater than 2;
• and
• 2) subjecting the transform result signal to N-point inverse discrete Fourier transform and thereby implementing a second stage of the first inverse discrete Fourier transform to generate the orthogonal-multi-carrier signal, the second stage following the first stage, wherein N denotes a predetermined natural number greater than twice M.

An apparatus for transmitting an orthogonal-multi-carrier signal, comprising:

• first means for subjecting an information signal to inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• second means for outputting the orthogonal-multi-carrier signal generated by the first means to a transmission line;
• third means for receiving the orthogonal-multi-carrier signal from the transmission line;
• fourth means for subjecting the orthogonal-multi-carrier signal received by the third means to first discrete Fourier transform to recover the information signal from the received orthogonal-multi-carrier signal;
• fifth means contained in the fourth means for subjecting the orthogonal-multi-carrier signal to N-point discrete Fourier transform and thereby implementing a first stage of the first discrete Fourier transform, and for generating a first transform result signal representative of results of the N-point discrete Fourier transform, wherein N denotes a predetermined natural number greater than 4;
• sixth means contained in the fourth means for subjecting the first transform result signal generated by the fifth means to M-point discrete Fourier transform and thereby implementing a second stage of the first discrete Fourier transform, and for generating a second transform result signal representative of results of the M-point discrete Fourier transform, the second stage following the first stage, wherein M denotes a predetermined natural number smaller than a half of N;
• and
• seventh means contained in the fourth means for converting the second transform result signal generated by the sixth means into the information signal.

An apparatus for transmitting an orthogonal-multi-carrier signal, comprising:

• first means for subjecting a multi-channel information signal to inverse discrete Fourier transform to convert the multi-channel information signal into an orthogonal-multi-carrier signal;
• second means for outputting the orthogonal-multi-carrier signal generated by the first means to a transmission line;
• third means for receiving the orthogonal-multi-carrier signal from the transmission line;
• fourth means for subjecting the orthogonal-multi-carrier signal received by the third means to first discrete Fourier transform to recover the multi-channel information signal from the received orthogonal-multi-carrier signal;
• fifth means contained in the fourth means for subjecting the orthogonal-multi-carrier signal to N-point discrete Fourier transform and thereby implementing a first stage of the first discrete Fourier transform, and for generating a first transform result signal representative of results of the N-point discrete Fourier transform, wherein N denotes a predetermined natural number greater than 4;
• a plurality of sixth means contained in the fourth means for subjecting the first transform result signal generated by the fifth means to M-point discrete Fourier transform and thereby implementing a second stage of the first discrete Fourier transform, and for generating second transform result signals representative of results of the M-point discrete Fourier transform, the second stage following the first stage, wherein M denotes a predetermined natural number smaller than a half of N;
• and
• seventh means contained in the fourth means for converting the second transform result signals generated by the sixth means into the multi-channel information signal.

An apparatus for transmitting an orthogonal-multi-carrier signal, comprising:

• first means for subjecting an information signal to inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• second means for outputting the orthogonal-multi-carrier signal generated by the first means to a transmission line;
• third means for receiving the orthogonal-multi-carrier signal from the transmission line;
• fourth means for subjecting the orthogonal-multi-carrier signal received by the third means to first discrete Fourier transform to recover the information signal from the received orthogonal-multi-carrier signal;
• fifth means contained in the fourth means for subjecting the orthogonal-multi-carrier signal to N-point discrete Fourier transform and thereby implementing a first stage of the first discrete Fourier transform, and for generating a first transform result signal representative of results of the N-point discrete Fourier transform, wherein N denotes a predetermined natural number greater than 4;
• sixth means contained in the fourth means for subjecting the first transform result signal generated by the fifth means to M-point discrete Fourier transform responsive to rotation factors depending on a desired transmission channel and thereby implementing a second stage of the first discrete Fourier transform, and for generating a second transform result signal representative of results of the M-point discrete Fourier transform, the second stage following the first stage, wherein M denotes a predetermined natural number smaller than a half of N;
• and
• seventh means contained in the fourth means for converting the second transform result signal generated by the sixth means into the information signal.

An apparatus for transmitting an orthogonal-multi-carrier signal, comprising:

• first means for subjecting an information signal to inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• second means for outputting the orthogonal-multi-carrier signal generated by the first means to a transmission line;
• third means for receiving the orthogonal-multi-carrier signal from the transmission line;
• fourth means for subjecting the orthogonal-multi-carrier signal received by the third means to first discrete Fourier transform to recover the information signal from the received orthogonal-multi-carrier signal;
• fifth means contained in the fourth means for subjecting the orthogonal-multi-carrier signal to N-point discrete Fourier transform and thereby implementing a first stage of the first discrete Fourier transform, and for generating a first transform result signal representative of results of the N-point discrete Fourier transform, wherein N denotes a predetermined natural number greater than 4;
• sixth means contained in the fourth means for feeding the first transform result signal from the fifth means to input terminals of M-point inverse discrete Fourier transform and subjecting the first transform result signal to the M-point discrete Fourier transform, and thereby implementing a second stage of the first discrete Fourier transform, and for generating a second transform result signal representative of results of the M-point discrete Fourier transform, the second stage following the first stage, the input terminals depending on a desired transmission channel, wherein M denotes a predetermined natural number smaller than a half of N;
• and
• seventh means contained in the fourth means for converting the second transform result signal generated by the sixth means into the information signal.

A method of transmitting an orthogonal-multi-carrier signal, comprising the steps of:

• subjecting an information signal to inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• outputting the orthogonal-multi-carrier signal to a transmission line;
• receiving the orthogonal-multi-carrier signal from the transmission line;
• and
• subjecting the received orthogonal-multi-carrier signal to first discrete Fourier transform to recover the information signal from the received orthogonal-multi-carrier signal;
• wherein the subjecting step comprises:
• 1) subjecting the orthogonal-multi-carrier signal to N-point discrete Fourier transform and thereby implementing a first stage of the first discrete Fourier transform, and generating a first transform result signal representative of results of the N-point discrete Fourier transform, wherein N denotes a predetermined natural number greater than 4;
• 2) subjecting the first transform result signal to M-point discrete Fourier transform and thereby implementing a second stage of the first discrete Fourier transform, and generating a second transform result signal representative of results of the M-point discrete Fourier transform, the second stage following the first stage, wherein M denotes a predetermined natural number smaller than a half of N;
• and
• 3) converting the second transform result signal into the information signal.

A method of transmitting an orthogonal-multi-carrier signal, comprising the steps of:

• subjecting an information signal to inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• outputting the orthogonal-multi-carrier signal to a transmission line;
• receiving the orthogonal-multi-carrier signal from the transmission line;
• and
• subjecting the received orthogonal-multi-carrier signal to first discrete Fourier transform to recover the information signal from the received orthogonal-multi-carrier signal;
• wherein the subjecting step comprises:
• 1) subjecting the orthogonal-multi-carrier signal to N-point discrete Fourier transform and thereby implementing a first stage of the first discrete Fourier transform, and generating a first transform result signal representative of results of the N-point discrete Fourier transform, wherein N denotes a predetermined natural number greater than 4;
• 2) subjecting the first transform result signal to M-point discrete Fourier transform responsive to rotation factors depending on a desired transmission channel and thereby implementing a second stage of the first discrete Fourier transform, and generating a second transform result signal representative of results of the M-point discrete Fourier transform, the second stage following the first stage, wherein M denotes a predetermined natural number smaller than a half of N;
• and
• 3) converting the second transform result signal into the information signal.

An apparatus comprising:

• first means for subjecting an information signal to first inverse discrete Fourier transform to convert the information signal into an orthogonal-multi-carrier signal;
• second means contained in the first means for subjecting the information signal to M-point inverse discrete Fourier transform and thereby implementing a first stage of the first inverse discrete Fourier transform, and for generating a transform result signal representative of results of the M-point inverse discrete Fourier transform, wherein M denotes a predetermined natural number greater than 2;
• and
• third means contained in the first means for subjecting the transform result signal generated by the second means to N-point inverse discrete Fourier transform and thereby implementing a second stage of the first inverse discrete Fourier transform to generate the orthogonal-multi-carrier signal, the second stage following the first stage, wherein N denotes a predetermined natural number greater than twice M.

An apparatus comprising:

• first means for subjecting an orthogonal-multi-carrier signal to first discrete Fourier transform to recover an information signal from the orthogonal-multi-carrier signal;
• second means contained in the first means for subjecting the orthogonal-multi-carrier signal to N-point discrete Fourier transform and thereby implementing a first stage of the first discrete Fourier transform, and for generating a first transform result signal representative of results of the N-point discrete Fourier transform, wherein N denotes a predetermined natural number greater than 4;
• third means contained in the first means for subjecting the first transform result signal generated by the second means to M-point discrete Fourier transform and thereby implementing a second stage of the first discrete Fourier transform, and for generating a second transform result signal representative of results of the M-point discrete Fourier transform, the second stage following the first stage, wherein M denotes a predetermined natural number smaller than a half of N;
• and
• fourth means contained in the first means for converting the second transform result signal generated by the third means into the information signal.