The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 14, 1995
Filed:
Nov. 12, 1993
Minoru Inatsu, Tokyo 156, JP;
Kimio Watanabe, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Other;
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.