Title:
SPECTRUM SPREAD COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2011/158681
Kind Code:
A1
Abstract:
Disclosed is a spectrum spread communication system which is hardly influenced by a noise, and can identify a frame structure at the reception side if a frame synchronization signal is not transmitted. A spread code generator (42) switches spread codes (Scai, Scbi) for each frame, and outputs to a spread/modulation unit (41). The spread/modulation unit (41) spreads and modulates transmission data and transmits to a direct current power line (2). A reference code generator (44) generates reference codes (Scai, Scbi) at the same code phase. Spread/demodulation units (43a, 43b) spread and demodulate the received signal using the reference codes (Scai, Scbi), and output to a selection unit (47). A frame synchronization detection unit (46) identifies a frame structure on the basis of the switching of synchronization states of the code phase in a code phase synchronization detection unit (45). The selection unit (47) outputs reception data by selecting the spread/demodulated data output from the phase-synchronized spread/demodulation unit among the spread/demodulation units (43a, 43b).
Inventors:
KASAI YUJI (JP)
MURAKAWA MASAHIRO (JP)
MURAKAWA MASAHIRO (JP)
Application Number:
PCT/JP2011/062909
Publication Date:
December 22, 2011
Filing Date:
June 06, 2011
Export Citation:
Assignee:
NAT INST OF ADVANCED IND SCIEN (JP)
KASAI YUJI (JP)
MURAKAWA MASAHIRO (JP)
HIGUCHI TETSUYA (JP)
KASAI YUJI (JP)
MURAKAWA MASAHIRO (JP)
HIGUCHI TETSUYA (JP)
International Classes:
H04B1/707; H02J13/00; H04B3/54; H04J13/16; H04Q9/00
Foreign References:
| JPH0537517A | 1993-02-12 | |||
| JPH0275240A | 1990-03-14 | |||
| JPH08251076A | 1996-09-27 | |||
| JPH08186521A | 1996-07-16 | |||
| JP2001148647A | 2001-05-29 | |||
| JPH05191379A | 1993-07-30 | |||
| JP2010512139A | 2010-04-15 |
Other References:
See also references of EP 2582061A4
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Claims: