Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
2006-02-21
2006-02-21
Phan, Man U. (Department: 2665)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
C370S335000, C370S441000, C370S503000, C375S148000, C375S152000
Reexamination Certificate
active
07002945
ABSTRACT:
A spreading code setting circuit generates N vectors, as spreading codes, which are +1 or −1 polarity and are unique to users. A multiplier multiplies the nth data and the nth spreading code corresponding thereto for the spread modulation. An FDM combining circuit modulates N pieces of data according to the FDM method. A FDM separating circuit demodulates received signals according to the FDM method. An inverse spreading code setting circuit generates N vectors, as inverse spreading codes, which are +1 or −1 polarity and are unique to users at the transmission side. A multiplier multiplies the nth data and the nth inverse spreading code corresponding thereto for inverse spread modulation.
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NEC Corporation
Phan Man U.
Whitham Curtis & Christofferson, P.C.
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