Clarion Co

Mitsubishi Electric Corporation

Tohoku University

Kazuo Tsubouchi

Hiroyuki Nakase

Kazuya Masu

Yasuhito Fujita

Suguru Kameda

Akinori Fujimura

Tadashi Takagi

Fumio Ishizu

Yasushi Sogabe

Shoichi Oshima

A transmission device () includes: a series/parallel converter (); an MSK modulator () for modulating a signal on a channel basis; a D/A converter (); a frequency converter () for conversion into different carrier frequencies; a synchronization circuit (); an amplifier (); a multiplexer () for multiplexing amplification signals; and an antenna (). A reception device () includes: an antenna (); a demultiplexer (); a frequency converter () for converting signal demultiplexed on a channel basis into a baseband frequency; a low-pass filter () for removing a higher-harmonic component of the signal; an A/D converter (); a digital filter () for extracting a main wave component from the digital signal; a sampling point detection circuit () for detecting a sampling point from the main wave component; an MSK demodulator () for reproducing and demodulating a symbol point based on detection information by an interpolation process; and a parallel/series converter () for restoring an original signal from the demodulated signal.

Radio communication system

A cellular wireless communication network system having a plurality of base stations () and a plurality of mobile stations (#i) (i is an integer from 1 to N) is provided in which communication with wireless circuit is established between the respective base stations (), and a flexibility of arrangement for the base station location is improved to realize a construction of the communication network with inexpensive cost.

Wireless communication method

A code division multiplex communications system has a receiver for receiving a radio wave and transforming the radio wave to an electric signal. A voltage-current converter converts the electric signal to a current signal. A current delay mechanism then sequentially reads the electric signal during a clock pulse. Adders and subtractors manipulated output currents of the current delay mechanism in accordance with a spread code and a reproducing mechanism reproducing a transmission signal depending on the output of the adder and subtractor.

Code division multiplex communications system

A code division multiplex communications system comprising: receiving circuit for receiving a radio wave and transforming the radio wave to an electric signal; delaying circuit for sequentially reading the electric signal at a timing of a clock pulse; switching circuit for shutting off a drive current of the delaying circuit at an OFF timing of the clock pulse; adding and subtracting circuit for adding and subtracting outputs of the delaying circuit in accordance with a spread code; and reproducing circuit for reproducing a transmission signal on the basis of an output of the adding and subtracting circuit. RCS95-120 is similar with respect to a point that an analog LSI matched filter is constructed by a slide capacitor system.

Growing community of inventors

Miyagi, Japan

Kazuo Tsubouchi