Data transmission system and data transmission method
OwnerTakashi Kaku, Yoshinori Tanakainventors
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Abstract
A transmission part produces a copy of a given narrow-band signal so as to obtain a number of same signals according to predetermined orthogonal sequence, and performs respective phase rotations on the thus-obtained signals according to the present invention orthogonal sequence. A reception part performs reverse phase rotation on the reception signals according to the predetermined orthogonal sequence, and then performs mutual addition thereon so as to restore the narrow-band signal.
Claims18
A data transmission system comprising:
- a transmission part producing a copy of a given narrow-band signal so as to obtain a number of identical signals according to a predetermined orthogonal sequence, and performing respective phase rotations on the thus-obtained signals according to the predetermined orthogonal sequence;
- and
- a reception part performing reverse phase rotation on the reception signals according to the predetermined orthogonal sequence, and then performing mutual addition thereon so as to restore the narrow-band signal.
A data transmission apparatus comprising:
- a part producing a copy of a given narrow-band signal so as to obtain a number of same signals according to predetermined orthogonal sequence;
- and
- part performing respective phase rotations on the thus-obtained signals according to the orthogonal sequence
A data transmission apparatus comprising:
- a part performing reverse phase rotation on a reception signal according to a predetermined orthogonal sequence;
- and
- a part performing mutual addition thereon so as to restore an original narrow-band signal.
The data transmission apparatus as claimed in clam 9, comprising:
- a part extracting zero points inserted in the signal at a transmission end, based on a predetermined frequency of zero point insertion;
- a part, by using noise components carried on the thus-extracted zero points, canceling noise components carried on signal points included in the received signal.
The data transmission apparatus as claimed in clam 9, comprising:
- a part performing orthogonal amplitude demodulation on a received signal;
- a part extracting zero points inserted in the signal at a transmission end, based on a predetermined frequency of zero point insertion;
- a part, by using noise components carried on the thus-extracted zero points, canceling noise components carried on signal points included in the received signal.
A data transmission method comprising the steps of:
- a) producing a copy of a given narrow-band signal so as to obtain a number of identical signals according to a predetermined orthogonal sequence;
- and
- b) performing respective phase rotations on the thus-obtained signals according to the present invention orthogonal sequence.
A data transmission method comprising the steps of:
- a) performing reverse phase rotation on reception signals according to a predetermined orthogonal sequence;
- and
- b) performing mutual addition of the signals obtained through said step a) so as to restore the narrow-band signal.
A data transmission method comprising the steps of:
- a) producing a copy of a given narrow-band signal so as to obtain a number of identical signals according to a predetermined orthogonal sequence;
- b) performing respective phase rotations on the thus-obtained signals according to the present invention orthogonal sequence;
- c) performing reverse phase rotation on reception signals according to the predetermined orthogonal sequence;
- and
- d) performing mutual addition of the signals obtained through said step c) so as to restore the narrow-band signal.
Dependencies are inferred from the claim text.