Data transmission system and data transmission method
First Claim
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1. 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.
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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.
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Citations
18 Claims
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1. A data transmission system comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. A data transmission apparatus comprising:
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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 - View Dependent Claims (6, 7, 8)
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9. A data transmission apparatus comprising:
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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. - View Dependent Claims (10)
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11. The data transmission apparatus as claimed in clam 9, comprising:
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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.
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12. The data transmission apparatus as claimed in clam 9, comprising:
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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.
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13. A data transmission method comprising the steps of:
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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.
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14. A data transmission method comprising the steps of:
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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.
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15. A data transmission method comprising the steps of:
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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. - View Dependent Claims (16, 17, 18)
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Specification