EP0687074A2
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EP
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Spread spectrum communication method
Assignee: Canon Inc
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Filing: 1995-05-31
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Granted: —
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Expires: 2015-05-31
Abstract
Abstract A spread spectrum communication method in which, on the transmission side, each item of parallel data is spread with a different code, and is encoded into a combination of I-channel and Q-channel signals. On the reception side, the combination of I-channel and Q-channel signals is encoded to correlate it with each of a plurality of codes.
Inventors
- 👤 Tetsuo C/O Canon K.K. Kanda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 01:03
CPC Classifications
H; H04; H04J; H04J13/00; H04J13/10; H04B; H04B1/00; H04B1/69; H04B1/707
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A spread spectrum communication method comprising a processing step (102) for processing parallel data using a plurality of sets of spreading codes, characterized in that it further comprises the steps of: a communicating step (106I, 106Q) for communicating the parallel data processed by the plurality of sets of spreading codes via first and second channels, and a determining step (104) for determining an allocation between the parallel data and an encoded combination of a first channel signal and a second channel signal.
Claim 2
Dependent Claim
26 words
A method according to Claim 1, further comprising an adding step (103) for adding the parallel data processed by the plurality of sets of spreading codes.
Claim 3
Dependent Claim
40 words
A method according to Claim 2, wherein the determining step determines energies of the first and second channel signals out of a predetermined range to be larger than that of the first and second channel signals within the predetermined range.
Claim 4
Dependent Claim
69 words
A spread spectrum communication method comprising a processing step (303) for processing received data and a plurality of sets of spreading codes, characterized in that it further comprises the steps of: a receiving step (301I, 301Q) for receiving first and second channel signals via first and second channels, and a determining step (302) for determining the received data based on an encoded combination of the first and second signals.
Claim 5
Dependent Claim
27 words
A method according to Claim 4, wherein the receiving step includes a converting step for converting the first and second channel signals into a base band frequency.
Claim 6
Dependent Claim
36 words
A method according to Claim 4, wherein the receiving step receives the first and second channel signals out of a predetermined range having larger energies than the first and second channel signals within the predetermined range.
Claim 7
Dependent Claim
24 words
Spread spectrum transmission apparatus comprising processing parallel data using a plurality of spreading codes, and means for allocating the processed data between two channels.
Claim 8
Dependent Claim
23 words
Spread spectrum reception apparatus comprising parallel means for receiving data transmitted from the apparatus of claim 7, and for decoding the received data.
Claim 9
Dependent Claim
20 words
Spread spectrum communication apparatus including transmitting apparatus as claimed in claim 7 and reception apparatus as claimed in claim 8.
References Cited (Backward Citations)
EP0622920A1
Cited
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