Spread-spectrum communication system
First Claim
1. A spread-spectrum signal transmitting apparatus comprising:
- first generating means for generating, in parallel, a plurality of carrier-wave signals having frequencies that different from one another;
second generating means for generating a spread-spectrum code sequence having a plurality of digits; and
modulating means for modulating each of the plurality of carrier-wave signals generated by said first generating means, based upon information to be transmitted and each of the plurality of digits generated by said second generating means.
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Accused Products
Abstract
In order to eliminate the need for spread-spectrum code synchronization, a code divided into a suitable number of digits is applied to a transmitter and a receiver. The transmitter multiplies an original signal by each subdivision of the code to produce n-number of new baseband signals. Carrier waves having n-types of frequencies are modulated by these signals and the modulated signals are added to obtain an ultra-wide band signal, which is then transmitted to the receiver. The receiver separates the received signal into the narrow band components which prevailed prior to the adding operation in the transmitter, and then demodulates each component into a baseband signal. Each of these demodulated signals is multiplied by a code the same as that on the transmitting side, whereby n-number of original signals are obtained. Original signals obtained from a signal spread by a code different from that of the receiver are not n in number. Thus, spread-spectrum communication can be realized without requiring spread-spectrum code synchronization.
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Citations
45 Claims
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1. A spread-spectrum signal transmitting apparatus comprising:
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first generating means for generating, in parallel, a plurality of carrier-wave signals having frequencies that different from one another; second generating means for generating a spread-spectrum code sequence having a plurality of digits; and modulating means for modulating each of the plurality of carrier-wave signals generated by said first generating means, based upon information to be transmitted and each of the plurality of digits generated by said second generating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 20, 21)
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8. A spread-spectrum signal transmitting apparatus comprising:
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a plurality of multiplying means for multiplying each digit of a plurality of digits of a spread-spectrum code sequence by a corresponding digit representing information to be transmitted; and modulating means for modulating an output of each of the plurality of multiplying means by a corresponding carrier wave signal, each carrier wave signal having a different frequency. - View Dependent Claims (9, 10, 22, 23)
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11. A spread-spectrum signal receiving apparatus comprising:
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generating means for generating a spread-spectrum code sequence having a plurality of digits; reverse spreading means for reverse-spreading a receive signal, for each of a plurality of frequency bands based upon each of the plurality of digits generated by said generating means; and decision means for discriminating original data based upon a reverse-spread output procured by said reverse spreading means for each frequency band of the received signal. - View Dependent Claims (12, 13, 14, 15, 24)
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16. A spread-spectrum signal receiving apparatus comprising:
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a plurality of multiplying means for multiplying each digit representing a received signal by a corresponding digit of a plurality of digits of a spread-spectrum core sequence, said multiplication being performed for each of a corresponding carrier-wave frequency; and decision means for discriminating original data based upon outputs from said plurality of multiplying means. - View Dependent Claims (17, 18, 19)
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25. A spread-spectrum communication system comprising:
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a transmitting side for modulating each of a plurality of carrier-wave signals having different frequencies, based upon information to be transmitted and a plurality of digits of a spread-spectrum core sequence; and a receiving side for demodulating a received signal for each of a plurality of frequency bands based upon search of the plurality of digits of the spread-spectrum code sequence and for discriminating the information based upon a demodulated result of each of the plurality of frequency bands, the plurality of frequency bands corresponding to frequencies of the plurality of carrier-wave signals. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
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34. A wireless communication system comprising:
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a transmitting side for modulating each of a plurality of carrier-wave signals having different frequencies, based upon information to be transmitted; and a receiving side for demodulating a received signal for each of a plurality of frequency bands and discriminating information based upon a demodulated result of each of the plurality of frequency bands, wherein the plurality of frequency bands correspond to the frequencies of the plurality of carrier-wave signals. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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42. A wireless signal receiving apparatus comprising:
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a plurality of demodulating means for demodulating a received signal for each of a plurality of frequency bands; and discriminating means for discriminating original data based upon an average of a plurality of demodulated results output by the plurality of demodulating means. - View Dependent Claims (43, 44, 45)
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Specification