Spread spectrum communication device
First Claim
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1. A spread spectrum communication system, comprising:
- a transmitter which includes;
a first PN code generator for generating a first PN code;
first modulating means for modulating a predetermined carrier wave with said first PN code outputted by said first PN code generator;
switching means for separating modulated signals from said first modulating means into two parts in response to information data;
a first filter which passes the lower band of one of the two parts separated by said switching means;
a second filter which passes the upper band of the other of the two parts separated by said switching means; and
synthesizing means for combining outputs of said first and said second filters; and
a receiver which includes;
a second PN code generator for generating a second PN code, which is inverted in time with respect to said first PN code in the transmitter;
second modulating means for converting the second PN code outputted by said second PN code generator in frequency by using a predetermined carrier signal;
correlating means for correlating a received signal with the output of said second modulating means;
a third filter which passes the lower band component of the spectre outputted by said correlating means;
a fourth filter which passes the upper band component of the spectre outputted by said correlating means; and
data comparing means, which reproduced the information data, while comparing the output level of said third filter with the output level of said fourth filter.
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Abstract
A spread spectrum communication device is disclosed, which can reproduce data by means of one convolver by using the upper band component and the lower band component of the spectre spectrum (SS) signal and the upper band component and the lower band component of the spectre of a correlation output.
33 Citations
6 Claims
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1. A spread spectrum communication system, comprising:
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a transmitter which includes; a first PN code generator for generating a first PN code; first modulating means for modulating a predetermined carrier wave with said first PN code outputted by said first PN code generator; switching means for separating modulated signals from said first modulating means into two parts in response to information data; a first filter which passes the lower band of one of the two parts separated by said switching means; a second filter which passes the upper band of the other of the two parts separated by said switching means; and synthesizing means for combining outputs of said first and said second filters; and a receiver which includes; a second PN code generator for generating a second PN code, which is inverted in time with respect to said first PN code in the transmitter; second modulating means for converting the second PN code outputted by said second PN code generator in frequency by using a predetermined carrier signal; correlating means for correlating a received signal with the output of said second modulating means; a third filter which passes the lower band component of the spectre outputted by said correlating means; a fourth filter which passes the upper band component of the spectre outputted by said correlating means; and data comparing means, which reproduced the information data, while comparing the output level of said third filter with the output level of said fourth filter. - View Dependent Claims (2, 3)
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4. A spread spectrum communication system, comprising:
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a transmitter which includes; a first PN code generator for selectively outputting one of a first PN code and a second PN code in response to information data; and first modulating means for modulating a predetermined carrier with the output of said first PN code generator; and a receiver which includes; second modulating means for modulating a predetermined carrier with a third PN code which is the inverse in time of said first PN code, and third modulating means for modulating a predetermined carrier with a fourth PN code which is the inverse in time of said second PN code; a first filter which passes the lower band component of the spectre outputted by said second modulating means; a second filter which passes the upper band component of the spectre outputted by said third modulating means; synthesizing means for combining outputs of said first and said second filters; correlating means for correlating a received signal with the output of said synthesizing means; a third filter which passes the lower band component of the spectre outputted by said correlating means; a fourth filter which passes the upper band component of the spectre outputted by said correlating means; and data comparing means, which reproduces the information data, while comparing the output level of said third filter with the output level of said fourth filter. - View Dependent Claims (5, 6)
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Specification