EP0708534A2
Expired / Lapsed
EP
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Spread spectrum receiving apparatus
Assignee: Canon Inc
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Filing: 1995-10-20
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Granted: —
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Expires: 2015-10-20
Abstract
Abstract A receiving apparatus includes a base-band conversion circuit, a synchronizing circuit/code generator and a demodulator. The base-band conversion circuit converts a received signal into a base-band signal. The synchronizing circuit/code generator detects a spread code included in the received signal to generate a plurality of spread codes in synchronization with the spread code included in the received signal. The demodulator uses the plurality of spread codes supplied by the synchronizing circuit/code generator to demodulate the base-band signal.
Inventors
- 👤 Norihiro Mochizuki
- 👤 Katsuo Saito
- 👤 Akira Torisawa
- 👤 Toshihiko Myojo
- 👤 Ichiro Kato
- 👤 Tetsuo Kanda
- 👤 Atsushi Takasaki
- 👤 Kazuo Moritomo
- 👤 Rie Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 00:54
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
A receiving apparatus for receiving a multi-code spread spectrum signal, said receiving apparatus comprising: detection means (4B, 200, 4, 200A) for detecting a spread code included in the received signal; and demodulation means (7A, 7B, 7, 7I, 7Q) for demodulating the received signal in accordance with a plurality of spread codes in synchronization with a detection performed by said detection means, characterized by conversion means (6A, 6, 19, 6B) for converting a received signal into a base-band signal; and said detection means detects the spread code from the base-band signal; and said demodulating means demodulates the base-band signal in accordance with the plurality of spread codes.
Claim 2
Dependent Claim
16 words
A receiving apparatus according to Claim 1, wherein said conversion means includes a local oscillator (201).
Claim 3
Dependent Claim
22 words
A receiving apparatus according to Claim 1, wherein said conversion means converts the received signal into two base-band signals having different phases.
Claim 4
Dependent Claim
82 words
A receiving apparatus according to Claim 1, wherein said demodulation means comprises: analog/digital conversion means (711, 712, 13, 14) for analog/digital converting the base-band signal; calculation means (902, 23B) for calculating an output from said analog/digital conversion means and the plurality of spread codes; integrating means (903, 23C) for integrating the output from said calculation means for one period of the spread code; and discrimination means (715, 24) for discriminating the received signal in accordance with an output from said integrating means.
Claim 5
Dependent Claim
45 words
A receiving apparatus according to Claim 1, wherein said detection means detects the spread code in response to a first clock, and said demodulation means performs demodulation in response to a second clock, the frequency of which is lower than that of the first clock.
Claim 6
Dependent Claim
41 words
A receiving apparatus according to Claim 1, wherein said conversion means includes an analog/digital conversion means (13, 14) for analog/digital converting the base-band signal, and said demodulation means (22, 22A) includes means for thinning an output from said analog/digital conversion means.
Claim 7
Dependent Claim
85 words
A receiving apparatus according to Claim 1, wherein said detection means comprises: sampling means (13, 14) for sampling the base-band signal; correlation means (15, 16) for causing an output from said sampling means and the spread code to correlate with each other; delay means (18) for delaying an output from said correlation means; and supply means (20) for supplying a sampling clock to said sampling means in accordance with the difference between an output from said correlation means and an output from said delay means.
Claim 8
Dependent Claim
90 words
A receiving apparatus according to Claim 1, wherein said detection means comprises: sampling means (13, 14) for sampling the base-band signal; correlation means (15, 16) for causing an output from said sampling means and the spread code to correlate with each other; shift detection means (201) for detecting a shift in sampling of a peak of correlation in accordance with an output from said correlation means; and supply means (20) for supplying a sampling clock to said sampling means in accordance with the shift detected by said shift detection means.
Claim 9
Dependent Claim
24 words
A receiving apparatus according to Claim 1, wherein said conversion means includes reproducing means (5, 5A) for reproducing a carrier of the received signal.
Claim 10
Dependent Claim
16 words
A receiving apparatus according to Claim 1, wherein said conversion means includes a costas loop (51).
Claim 11
Dependent Claim
27 words
A receiving apparatus according to Claim 3, wherein said demodulation means demodulates each of the two base-band signals to demodulate a signal that has been orthogonally modulated.
Claim 12
Independent Claim
87 words
A method of receiving a multi-code spread spectrum signal, said method comprising the steps of: converting a received signal into a base-band signal; detecting a spread code included in the received signal; and demodulating the received signal on the basis of a plurality of spread codes in synchronization with a detection performed in said detecting step, wherein the spread codes are detected from the base-band signal, and the received signal which is converted into said base-band signal being demodulated in accordance with the plurality of spread codes.
References Cited (Backward Citations)
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