One frequency repeater for a digital radio system
First Claim
1. A one frequency repeater for a digital radio system comprising:
- means for receiving a reception signal through a receiving antenna;
a transmitting antenna from which a transmission signal is transmitted, the transmission signal from said transmitting antenna leaking into said receiving antenna;
means for generating an interference cancellation signal for cancelling an interference signal caused by the leakage of the transmission signal included in an output signal from said receiving means;
means for adding the interference cancellation signal and the output signal of said receiving means;
demodulating means for detecting an amplitude and a phase of the interference signal from an output signal of said adding means, and providing a demodulated signal and an error signal obtained from said detected amplitude and phase of the interference signal;
means for data-converting the demodulated signal;
modulating means for modulating a carrier according to an output from said data converting means; and
transmitting means for transmitting the modulated signal from said transmitting antenna;
said interference cancellation signal generating means receiving the modulated signal and supplying the interference cancellation signal to said adding means in response to the error signal and converted data signal from said data converting means.
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Accused Products
Abstract
A one frequency repeater includes a receiver for receiving a reception signal through a receiving antenna, a variable frequency characteristic filter for generating a signal for cancelling an interference signal caused by leakage of a transmission signal into a receiving antenna, an adder for adding the interference signal and the reception signal, a demodulator for demodulating an output signal from the adder, a data converter for converting an output signal from the modulator, a modulator for modulating a carrier according to an output from the data converter, and a transmitter for transmitting from a transmitting antenna an output signal modulated by the modulator. The variable frequency characteristic filter receives the signal modulated by the modulator, is controlled in response to a control signal including the output from the data converter, and supplies the interference cancellation signal to the adder.
45 Citations
9 Claims
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1. A one frequency repeater for a digital radio system comprising:
- means for receiving a reception signal through a receiving antenna;
a transmitting antenna from which a transmission signal is transmitted, the transmission signal from said transmitting antenna leaking into said receiving antenna;
means for generating an interference cancellation signal for cancelling an interference signal caused by the leakage of the transmission signal included in an output signal from said receiving means;
means for adding the interference cancellation signal and the output signal of said receiving means;
demodulating means for detecting an amplitude and a phase of the interference signal from an output signal of said adding means, and providing a demodulated signal and an error signal obtained from said detected amplitude and phase of the interference signal;
means for data-converting the demodulated signal;
modulating means for modulating a carrier according to an output from said data converting means; and
transmitting means for transmitting the modulated signal from said transmitting antenna;
said interference cancellation signal generating means receiving the modulated signal and supplying the interference cancellation signal to said adding means in response to the error signal and converted data signal from said data converting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- means for receiving a reception signal through a receiving antenna;
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9. A repeater for a digital radio system having first and second routes having an identical transmission direction but different frequencies, f1 and f2 comprising;
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first and second transmitters for transmitting transmission signals of f1 and f2, respectively; first and second transmitters for transmitting transmission signals of f1 and f2, respectively, the transmission signals leaking into corresponding receivers, respectively; first and second modulators for modulating carrier waves of f1 and f2 with input signals thereof to output modulated signals to said first and second transmitters, respectively; first and second signal generators for generating first and second interference cancelling signals, respectively; first adder for adding the output signal of said first receiver and the first interference cancelling signal to output a first error signal; second adder for adding the output signal of said second receiver the second interference cancelling signal to output a second error signal; first demodulator for supplying a demodulated data signal to said second modulator and said second signal generator, and the first error signal output from said first adder to said first signal generator; and second demodulator for supplying a demodulated data signal to said first modulator and said first signal generator, and the second error signal output from said second adder to said second signal generator.
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Specification