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:
May. 11, 1999
Filed:
Nov. 27, 1996
Hitosi Matui, Tokyo, JP;
NEC Corporation, , JP;
Abstract
In a code multiplexing communication system, a transmission apparatus includes a code generator, a signal distribution unit, spreading units, a synthesizer, and a modulator, and a reception apparatus includes a correlator, an equalizer, demodulators, and a coupler. The code generator generates n spreading code series which are generated at timings different from the timing of a predetermined spreading code. The signal distribution unit divides a serial input signal having n.times.m bits per symbol timing into n parallel signals each consisting of m bits. The spreading units respectively spectrum-spread the n m-bit output signals by using the n output signals from code generator. The synthesizer synthesizes the output signals from the spreading units. The modulator modulates the output signal from the synthesizer. The correlator calculates the correlation between a baseband signal and the spreading code. The equalizer removes a delay distortion caused by a radio transmission path from the output signal from the correlator, and separates the signal into n signals. The demodulators respectively demodulate the n output signals from the equalizer and extract m-bit parallel signals. The coupler synthesizes the m-bit output signals from the demodulators and outputs a serial signal.