Patent US5793794A successfully refreshed from Google Patents.
US5793794A
Expired / Lapsed
US
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Spread spectrum receiving apparatus
Assignee: Canon Inc
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Filing: 1994-04-26
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Granted: 1998-08-11
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Expires: 2014-04-26
Abstract
Abstract A spread spectrum receiving apparatus comprises: a reproducing circuit to reproduce a carrier signal from a reception signal and a diffusion code; a demodulation circuit to demodulate the reception signal into a base band signal on the basis of the carrier signal reproduced by the reproducing circuit; and a judgment circuit to judge the reception data from the base band signal from the demodulation circuit. The reproducing circuit has an operation circuit to arithmetically operate the reception signal and the diffusion code and a detection circuit to detect a difference between the phases of an output of the operation circuit and an output of an oscillator. The oscillator oscillates at a carrier frequency in accordance with a phase difference detected by the detecting circuit.
Inventors
- 👤 Ichiro Kato
- 👤 Katsuo Saito
- 👤 Toshihiko Myojo
- 👤 Norihiro Mochizuki
- 👤 Hidetada Nago
- 👤 Tetsuo Kanda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:53
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/70712
Claims Analysis
Total Claims: 52
Claim 1
Independent Claim
93 words
A spread spectrum receiving apparatus comprising: reproducing means for reproducing a carrier signal from a reception signal; demodulating means for demodulating the reception signal to a baseband signal on the basis of the carrier signal reproduced by said reproducing means; de-spreading means for de-spreading the baseband signal from said demodulating means based on a de-spreading code, and outputting transmitted data; and extracting means for extracting a de-spreading code clock signal from the reception signal which is not de-spread by said de-spreading means, and supplying said de-spreading means with the de-spreading code clock signal.
Claim 2
Dependent Claim
93 words
A spread spectrum receiving apparatus comprising: reproducing means for reproducing a carrier signal from a reception signal; demodulating means for demodulating the reception signal to a baseband signal on the basis of the carrier signal reproduced by said reproducing means; de-spreading means for de-spreading the baseband signal from said demodulating means based on a de-spreading code, and outputting transmitted data; and extracting means for extracting a de-spreading code clock signal from the reception signal which is not de-spread by said de-spreading means, and supplying said de-spreading means with the de-spreading code clock signal.
Claim 3
Dependent Claim
65 words
An apparatus according to claim 1, wherein said reproducing means has operating means for arithmetically operating the reception signal and the de-spreading code and detecting means for detecting a difference between phases of an output of said operating means and an output of oscillating means, and said oscillating means oscillates at a carrier frequency in accordance with the phase difference detected by said detecting means.
Claim 4
Dependent Claim
26 words
An apparatus according to claim 1, wherein said de-spreading means includes generating means for generating the de-spreading code in accordance with the de-spreading code clock signal.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 1, wherein said extracting means extracts the de-spreading code clock signal from the reception signal which is not demodulated to the baseband signal.
Claim 6
Dependent Claim
23 words
An apparatus according to claim 1, wherein said reproducing means reproduces the carrier signal from the reception signal based on the spreading code.
Claim 7
Dependent Claim
20 words
An apparatus according to claim 1, wherein said extracting means includes a convolver for generating the de-spreading code clock signal.
Claim 8
Dependent Claim
22 words
An apparatus according to claim 1, wherein said extracting means includes a delay locked loop for generating the de-spreading code clock signal.
Claim 9
Dependent Claim
53 words
An apparatus according to claim 1, wherein said extracting means extracts the de-spreading code clock signal and a code synchronizing signal from the reception signal which is not de-spread by said de-spreading means, and said de-spreading means de-spreads the baseband signal based on the de-spreading code clock signal and the code synchronizing signal.
Claim 10
Dependent Claim
39 words
An apparatus according to claim 1, wherein said extracting means extracts the de-spreading code clock signal from the reception signal which is not de-spread by said de-spreading means and not demodulated to the baseband signal by said demodulating means.
Claim 11
Dependent Claim
69 words
A spread spectrum receiving apparatus comprising: converting means for converting a reception signal into a baseband signal; de-spreading means for de-spreading the baseband signal in accordance with a de-spreading code clock signal to output transmitted data; and extracting means for extracting the de-spreading code clock signal from the reception signal which is not de-spread by said de-spreading means, and supplying said de-spreading means with the de-spreading code clock signal.
Claim 12
Dependent Claim
69 words
A spread spectrum receiving apparatus comprising: converting means for converting a reception signal into a baseband signal; de-spreading means for de-spreading the baseband signal in accordance with a de-spreading code clock signal to output transmitted data; and extracting means for extracting the de-spreading code clock signal from the reception signal which is not de-spread by said de-spreading means, and supplying said de-spreading means with the de-spreading code clock signal.
Claim 13
Dependent Claim
26 words
An apparatus according to claim 10, wherein said de-spreading means includes generating means for generating a de-spreading code in accordance with the de-spreading code clock signal.
Claim 14
Dependent Claim
28 words
An apparatus according to claim 10, wherein said extracting means extracts the de-spreading code clock signal from the reception signal which is not converted into the baseband signal.
Claim 15
Dependent Claim
37 words
An apparatus according to claim 10, wherein said converting means includes reproducing means for reproducing a carrier signal based on a de-spreading code, and converts the reception signal into the baseband signal based on the carrier signal.
Claim 16
Dependent Claim
56 words
An apparatus according to claim 13, wherein said reproducing means includes processing means for processing the reception signal and the de-spreading code, oscillating means, and control means for controlling said oscillating means based on a phase difference between outputs of said processing means and said oscillating means such that said oscillating means generates the carrier signal.
Claim 17
Dependent Claim
20 words
An apparatus according to claim 10, wherein said extracting means includes a convolver for generating the de-spreading code clock signal.
Claim 18
Dependent Claim
22 words
An apparatus according to claim 10, wherein said extracting means includes a delay locked loop for generating the de-spreading code clock signal.
Claim 19
Dependent Claim
53 words
An apparatus according to claim 10, wherein said extracting means extracts the de-spreading code clock signal and a code synchronizing signal from the reception signal which is not de-spread by said de-spreading means, and said de-spreading means de-spreads the baseband signal based on the de-spreading code clock signal and the code synchronizing signal.
Claim 20
Dependent Claim
39 words
An apparatus according to claim 10, wherein said extracting means extracts the de-spreading code clock signal from the reception signal which is not de-spread by said de-spreading means and not converted to the baseband signal by said converting means.
Claim 21
Dependent Claim
67 words
A spread spectrum receiving apparatus comprising: converting means for converting a reception signal based on a de-spreading code; de-spreading means for de-spreading a converted reception signal from said converting means, and outputting transmitted data; and extracting means for extracting a de-spreading code clock signal from the reception signal which is not de-spread by said de-spreading means, and supplying said de-spreading means with the de-spreading code clock signal.
Claim 22
Dependent Claim
67 words
A spread spectrum receiving apparatus comprising: converting means for converting a reception signal based on a de-spreading code; de-spreading means for de-spreading a converted reception signal from said converting means, and outputting transmitted data; and extracting means for extracting a de-spreading code clock signal from the reception signal which is not de-spread by said de-spreading means, and supplying said de-spreading means with the de-spreading code clock signal.
Claim 23
Dependent Claim
18 words
An apparatus according to claim 19, wherein said converting means converts the reception signal into a baseband signal.
Claim 24
Dependent Claim
26 words
An apparatus according to claim 19, wherein said de-spreading means includes generating means for generating a de-spreading code in accordance with the de-spreading code clock signal.
Claim 25
Dependent Claim
28 words
An apparatus according to claim 21, wherein said extracting means extracts the de-spreading code clock signal from the reception signal which is not converted into the baseband signal.
Claim 26
Dependent Claim
37 words
An apparatus according to claim 21, wherein said converting means includes reproducing means for reproducing a carrier signal based on the de-spreading code, and converts the reception signal into the baseband signal based on the carrier signal.
Claim 27
Dependent Claim
56 words
An apparatus according to claim 23, wherein said reproducing means includes processing means for processing the reception signal and the de-spreading code, oscillating means, and control means for controlling said oscillating means based on a phase difference between outputs of said processing means and said oscillating means such that said oscillating means generates the carrier signal.
Claim 28
Dependent Claim
20 words
An apparatus according to claim 21, wherein said extracting means includes a convolver for generating the de-spreading code clock signal.
Claim 29
Dependent Claim
22 words
An apparatus according to claim 21, wherein said extracting means includes a delay locked loop for generating the de-spreading code clock signal.
Claim 30
Dependent Claim
54 words
An apparatus according to claim 19, wherein said extracting means extracts the de-spreading code clock signal and a code synchronizing signal from the reception signal which is not de-spread by said de-spreading means, and said de-spreading means de-spreads the converted reception signal based on the de-spreading code clock signal and the code synchronizing signal.
Claim 31
Dependent Claim
40 words
An apparatus according to claim 19, wherein said extracting means extracts the de-spreading code clock signal from the reception signal which is not de-spread by said de-spreading means and not converted based on the de-spreading code by said converting means.
Claim 32
Independent Claim
55 words
A method for receiving a spread spectrum signal, comprising the steps of: converting a reception signal into a baseband signal; de-spreading the baseband signal in accordance with a de-spreading code clock signal for reproducing transmitted data; and extracting the de-spreading code clock signal from the reception signal which is not de-spread in said de-spreading step.
Claim 33
Independent Claim
55 words
A method for receiving a spread spectrum signal, comprising the steps of: converting a reception signal into a baseband signal; de-spreading the baseband signal in accordance with a de-spreading code clock signal for reproducing transmitted data; and extracting the de-spreading code clock signal from the reception signal which is not de-spread in said de-spreading step.
Claim 34
Dependent Claim
27 words
A method according to claim 29, wherein said de-spreading step includes a generating step of generating a de-spreading code in accordance with the de-spreading code clock signal.
Claim 35
Dependent Claim
30 words
A method according to claim 29, wherein the de-spreading code clock signal is extracted in said extracting step from the reception signal which is not converted into the baseband signal.
Claim 36
Dependent Claim
38 words
A method according to claim 29, wherein said converting step includes a reproducing step of reproducing a carrier signal based on a de-spreading code, and converts the reception signal into the baseband signal based on the carrier signal.
Claim 37
Dependent Claim
57 words
A method according to claim 32, wherein said reproducing step includes a processing step of processing the reception signal and the de-spreading code, and a controlling step of controlling an oscillator based on a phase difference between a processing output of said processing and an output of the oscillator such that the oscillator generates the carrier signal.
Claim 38
Dependent Claim
18 words
A method according to claim 29, wherein the de-spreading code clock signal is extracted by using a convolver.
Claim 39
Dependent Claim
20 words
A method according to claim 29, wherein the de-spreading code clock signal is extracted by using a delay locked loop.
Claim 40
Dependent Claim
58 words
A method according to claim 29, wherein the de-spreading code clock signal and a code synchronizing signal are extracted in said extracting step, from the reception signal which is not de-spread in said de-spreading step, and the baseband signal is de-spread in said de-spreading step in accordance with the de-spreading code clock signal and the code synchronizing signal.
Claim 41
Dependent Claim
41 words
A method according to claim 29, wherein the de-spreading code clock signal is extracted in said extracting step, from the reception signal which is not de-spread in said de-spreading step and not converted into the baseband signal in said converting step.
Claim 42
Independent Claim
68 words
A method for receiving a spread spectrum signal, comprising the steps of: converting a reception signal based on a spreading code; de-spreading a converted reception signal for reproducing transmitted data; and extracting a de-spreading code clock signal from the reception signal which is not de-spread in said de-spreading step, wherein the converted reception signal is de-spread in said de-spreading step in accordance with the de-spreading code clock signal.
Claim 43
Independent Claim
68 words
A method for receiving a spread spectrum signal, comprising the steps of: converting a reception signal based on a spreading code; de-spreading a converted reception signal for reproducing transmitted data; and extracting a de-spreading code clock signal from the reception signal which is not de-spread in said de-spreading step, wherein the converted reception signal is de-spread in said de-spreading step in accordance with the de-spreading code clock signal.
Claim 44
Dependent Claim
27 words
A method according to claim 38, wherein said de-spreading step includes a generating step of generating a de-spreading code in accordance with the de-spreading code clock signal.
Claim 45
Dependent Claim
20 words
A method according to claim 38, wherein the reception signal is converted into a baseband signal in said converting step.
Claim 46
Dependent Claim
30 words
A method according to claim 40, wherein the de-spreading code clock signal is extracted in said extracting step from the reception signal which is not converted into the baseband signal.
Claim 47
Dependent Claim
38 words
A method according to claim 40, wherein said converting step includes a reproducing step of reproducing a carrier signal based on a de-spreading code, and converts the reception signal into the baseband signal based on the carrier signal.
Claim 48
Dependent Claim
57 words
A method according to claim 42, wherein said reproducing step includes a processing step of processing the reception signal and the de-spreading code, and a controlling step of controlling an oscillator based on a phase difference between a processing output of said processing and an output of the oscillator such that the oscillator generates the carrier signal.
Claim 49
Dependent Claim
18 words
A method according to claim 38, wherein the de-spreading code clock signal is extracted by using a convolver.
Claim 50
Dependent Claim
20 words
A method according to claim 38, wherein the de-spreading code clock signal is extracted by using a delay locked loop.
Claim 51
Dependent Claim
59 words
A method according to claim 38, wherein the de-spreading code clock signal and a code synchronizing signal are extracted in said extracting step, from the reception signal which is not de-spread in said de-spreading step, and the converted reception signal is de-spread in said de-spreading step in accordance with the de-spreading code clock signal and the code synchronizing signal.
Claim 52
Dependent Claim
42 words
A method according to claim 38, wherein the de-spreading code clock signal is extracted in said extracting step, from the reception signal which is not de-spread in said de-spreading step and not converted based on the spreading code in said converting step.
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