Spread spectrum communication system
First Claim
1. A spread spectrum communications system comprising:
- a transmitter including;
data generating means for generating a data signal to be transmitted;
pn generating means for generating a first pn code sequence in accordance with a pn code clock;
modulation means for modulating said pn code clock in accordance with said data signal by synchronizing said data signal with a multiple N of one period of said first pn code sequence;
first means for detecting one period of said first pn code sequence generated by said pn generating means;
second means for converting said detected period of said first pn code sequence into a period equal to a multiple N of said detected period and for outputting a clock with said N period to said data generating means; and
output means for transmitting a signal produced at an output of said pn generating means, anda receiver which receives the transmitted signal from the transmitter, said receiver including;
second pn generating means for generating a second pn code sequence in synchronism with said transmitted signal;
demodulation means for demodulating said transmitted signal with said second pn code sequence generated by said second pn generating means so as to reproduce data corresponding to said data signal;
third means for detecting one period of said second pn code sequence;
fourth means for converting said detected period of said second pn code sequence into a period equal to a multiple N of said detected period and for outputting a timing signal in accordance with said N period; and
discrimination means for detecting whether each bit of a demodulated signal at an output of said demodulation means is equal to a high value "1" or a low value "0" in synchronism with said timing signal of said fourth means.
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Accused Products
Abstract
A spread spectrum communication system includes a transmitter having: a data generator for generating a data signal; a pn generator for generating a first pn signal in accordance with a pn code clock; a modulator for modulating the pn code clock by synchronizing the data signal with a multiple N of one period of the first pn signal; a first part for detecting one period of the first pn signal; a second part for outputting a clock to the data generator in accordance with a converted period equal to a multiple N of the detected period; and an output part for transmitting a signal at an output of the pn generator, and a receiver which receives the transmitted signal, the receiver having: a second pn generator for generating a second pn signal in synchronism with the transmitted signal; a demodulator for demodulating the transmitted signal with the second pn signal; a third part for detecting one period of the second pn signal; a fourth part for outputting a timing signal in accordance with a converted period equal to a multiple N of the detected period; and a discriminator for detecting each bit of a demodulated signal in synchronism with the timing signal.
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Citations
12 Claims
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1. A spread spectrum communications system comprising:
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a transmitter including;
data generating means for generating a data signal to be transmitted;
pn generating means for generating a first pn code sequence in accordance with a pn code clock;
modulation means for modulating said pn code clock in accordance with said data signal by synchronizing said data signal with a multiple N of one period of said first pn code sequence;
first means for detecting one period of said first pn code sequence generated by said pn generating means;
second means for converting said detected period of said first pn code sequence into a period equal to a multiple N of said detected period and for outputting a clock with said N period to said data generating means; and
output means for transmitting a signal produced at an output of said pn generating means, anda receiver which receives the transmitted signal from the transmitter, said receiver including;
second pn generating means for generating a second pn code sequence in synchronism with said transmitted signal;
demodulation means for demodulating said transmitted signal with said second pn code sequence generated by said second pn generating means so as to reproduce data corresponding to said data signal;
third means for detecting one period of said second pn code sequence;
fourth means for converting said detected period of said second pn code sequence into a period equal to a multiple N of said detected period and for outputting a timing signal in accordance with said N period; and
discrimination means for detecting whether each bit of a demodulated signal at an output of said demodulation means is equal to a high value "1" or a low value "0" in synchronism with said timing signal of said fourth means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification