US 5,970,055 A · Radio communication system adapting time division duplexing/frequency hopping

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.

Claims17

Dependent claims

A radio communication system adapting time division duplexing/frequency hopping, comprising:

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 said hop frequency with provision of said transmission data;
a power amplifier for power-amplifying output of said frequency modulator;
an antenna for receiving input of a signal outputted from said power amplifier at a regular time period and radiating said inputted signal or receiving reception data;
a bandpass filter for bandpass-filtering reception data received from said antenna depending upon said hop frequency;
a switch for connecting said antenna with said power amplifier upon transmission and connecting said antenna with said bandpass filter upon reception;
a reception frequency mixer for receiving input of said bandpass-filtered reception signal and mixing said received signal with reception frequency corresponding to said hop frequency;
an intermediate frequency mixer for receiving output of said reception frequency mixer and mixing said received signal with an intermediate frequency;
and
a frequency demodulator for receiving output of said intermediate frequency mixer, demodulating frequency, and again inputting said demodulated frequency to said data source.

8 more elements

A radio communication system adapting time division duplexing/frequency hopping, comprising:

means for outputting signaling data;
a BCH encoder for outputting BCH encoded data by BCH encoding said signaling data;
means for outputting voice or data traffic;
first selection means for selectively providing said BCH encoded data, said voice traffic and said data traffic to a scrambler, said scrambler outputting a scrambled signal;
means for buffering said scrambled signal and outputting a data rate converted signal according to a time division duplexing control signal;
means for generating time division duplexing data packets by packet structuring said data rate converted signal into frames of data;
gaussian filter means for filtering said time division duplexing data packets and outputting pulse shaped signals;
frequency modulation means for generating frequency modulated signals by modulating said pulse shaped signals with transmission carrier waves;
means for generating said transmission carrier waves, wherein said transmission carrier waves are produced using a frequency hopping method;
bandpass filter means for outputting a transmission signal filtering and amplifying the frequency modulated signals output from said frequency modulation means;
and
second selection means for selectively providing said transmission signal to an antenna in response to said time division duplexing control signal.

9 more elements

Dependencies are inferred from the claim text.

Radio communication system adapting time division duplexing/frequency hopping

Life of this patent

Radio communication system adapting time division duplexing/frequency hopping

Life of this patent

Abstract

Claims17