Multiplex communications – Wide area network – Packet switching
Patent
1993-11-12
1995-02-14
Marcelo, Melvin
Multiplex communications
Wide area network
Packet switching
375 1, 380 46, 455 501, 455 63, H04J 1300
Patent
active
053901673
ABSTRACT:
A code-division multiplex communication apparatus for carrying out multiplex communication by using pseudo noise (PN) codes and an application system thereof are provided, which have high SN ratio and can be used in an environment wherein feeble radio waves are to be received or the strength of output radio waves is regulated. Exclusive-OR circuits output exclusive ORs each based on data and a PN code associated with the corresponding channel, and a majority logic circuit performs a majority logic operation on the exclusive ORs. Namely, the majority logic circuit outputs a logical "1" or "0" that is greater in number. The majority logic output is subjected to phase modulation and is then transmitted as a transmission signal. The transmission signal is demodulated at a receiving side, based on the same PN codes as those used at the transmitting side, thereby demodulating the data. The code-division multiplex communication apparatus is applicable to radio LAN and FA system.
REFERENCES:
patent: 4644523 (1987-02-01), Horwitz
Yutaka Nishikado et al., "A New Encoding and Decoding Schemes for Multiple Access Channels," The Transactions of the IECE of Japan, vol. E61, No. 4, Apr. 1978, pp. 310-311.
Inatsu Minoru
Watanabe Kimio
Fujitsu Limited
Inatsu Minoru
Marcelo Melvin
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