Radio communication system adapting time division duplexing/freq

Details Radio communication system adapting time division duplexing/freq Radio communication system adapting time division duplexing/freq

1997-08-25

1999-10-19

Nguyen, Chau

Multiplex communications

Duplex

Communication over free space

375202, H04J 1306

Patent

active

059700556

ABSTRACT:
A radio communication system adapting TDD/FH, for reducing interference of jammer, preventing third party's hearing, and enhancing frequency usage efficiency. The radio communication system adapting time division duplexing/frequency hopping, having: a data source for providing transmission data or receiving input of reception data; a hop frequency generator for generating frequency changed as frequencies preset at every given time; a frequency modulator for modulating frequency according to the transmission frequency corresponding to the hop frequency with provision of the transmission data; a power amplifier for power-amplifying output of the frequency modulator; an antenna for receiving input of a signal outputted from the power amplifier at a regular time period and radiating the inputted signal or receiving reception data; a bandpass filter for bandpass-filtering reception data received from the antenna depending upon the hop frequency; a switch for connecting the antenna with the power amplifier upon transmission and connecting the antenna with the bandpass filter upon reception; a reception frequency mixer for receiving input of the bandpass-filtered reception signal and mixing the received signal with reception frequency corresponding to the hop frequency; an intermediate frequency mixer for receiving output of the reception frequency mixer and mixing the received signal with an intermediate frequency; and a frequency demodulator for receiving output of the intermediate frequency mixer, demodulating frequency, and again inputting the demodulated frequency to the data source.

REFERENCES:
patent: 4694466 (1987-09-01), Kadin
patent: 4760586 (1988-07-01), Takeda
patent: 5541954 (1996-07-01), Tetsuichi
patent: 5796760 (1998-08-01), Wiedman et al.
patent: 5802110 (1998-09-01), Watanabe et al.

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