Communication device that transmits signals via a plurality of antennas and communication system
First Claim
1. A communication device comprising:
- a converter circuit configured to convert an optical signal that carries an oscillator signal of a radio frequency and a plurality of transmission signals of different intermediate frequencies generated in a signal processing device into an electric signal, the intermediate frequencies being different from the radio frequency and the oscillator signal being not used to generate the plurality of transmission signals;
an extractor configured to extract the oscillator signal from the electric signal;
a recovery circuit configured to recover the plurality of transmission signals from the electric signal;
a radio frequency signal generator configured to generate a plurality of radio frequency signals that respectively carry the plurality of transmission signals recovered by the recovery circuit using the oscillator signal extracted by the extractor;
a plurality of amplifiers respectively configured to amplify the plurality of radio frequency signals;
a plurality of antennas respectively configured to output the plurality of radio frequency signals amplified by the plurality of amplifiers;
a feedback circuit configured to generate a feedback signal from the plurality of radio frequency signals amplified by the plurality of amplifiers; and
a transmitter configured to convert the feedback signal into an optical signal and transmit the optical signal to the signal processing device.
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Accused Products
Abstract
A communication device includes: a converter circuit configured to convert an optical signal that carries an oscillator signal of a radio frequency and transmission signals generated in a signal processing device into an electric signal; an extractor configured to extract the oscillator signal from the electric signal; a recovery circuit configured to recover the transmission signals from the electric signal; a radio frequency signal generator configured to generate radio frequency signals that respectively carry the transmission signals recovered by the recovery circuit using the oscillator signal; amplifiers respectively configured to amplify the radio frequency signals; antennas respectively configured to output the amplified radio frequency signals; a feedback circuit configured to generate a feedback signal from the amplified radio frequency signals; and a transmitter configured to convert the feedback signal into an optical signal and transmit it to the signal processing device.
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Citations
11 Claims
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1. A communication device comprising:
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a converter circuit configured to convert an optical signal that carries an oscillator signal of a radio frequency and a plurality of transmission signals of different intermediate frequencies generated in a signal processing device into an electric signal, the intermediate frequencies being different from the radio frequency and the oscillator signal being not used to generate the plurality of transmission signals; an extractor configured to extract the oscillator signal from the electric signal; a recovery circuit configured to recover the plurality of transmission signals from the electric signal; a radio frequency signal generator configured to generate a plurality of radio frequency signals that respectively carry the plurality of transmission signals recovered by the recovery circuit using the oscillator signal extracted by the extractor; a plurality of amplifiers respectively configured to amplify the plurality of radio frequency signals; a plurality of antennas respectively configured to output the plurality of radio frequency signals amplified by the plurality of amplifiers; a feedback circuit configured to generate a feedback signal from the plurality of radio frequency signals amplified by the plurality of amplifiers; and a transmitter configured to convert the feedback signal into an optical signal and transmit the optical signal to the signal processing device. - View Dependent Claims (2, 3, 4, 5)
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6. A communication system that includes a signal processing device and a remote radio device, wherein
the signal processing device includes: -
an oscillator configured to generate an oscillator signal of a radio frequency; a modulated signal generator configured to generate a plurality of modulated signals of different intermediate frequencies from a plurality of transmission signals, the intermediate frequencies being different from the radio frequency and the oscillator signal being not used to generate the plurality of modulated signals; an optical signal generator configured to generate an optical signal that carries the plurality of modulated signals and the oscillator signal; a down-convert circuit configured to down-convert a feedback signal received from the remote radio device using the oscillator signal; and a correction circuit configured to correct the plurality of transmission signals based on the feedback signal down-converted by the down-convert circuit, and wherein the remote radio device includes; a converter circuit configured to convert the optical signal into an electric signal; an extractor configured to extract the oscillator signal from the electric signal; a recovery circuit configured to recover the plurality of transmission signals from the electric signal; a radio frequency signal generator configured to generate a plurality of radio frequency signals that respectively carry the plurality of transmission signals recovered by the recovery circuit using the oscillator signal extracted by the extractor; a plurality of amplifiers respectively configured to amplify the plurality of radio frequency signals; a plurality of antennas respectively configured to output the plurality of radio frequency signals amplified by the plurality of amplifiers; and a feedback circuit configured to generate the feedback signal from the plurality of radio frequency signals amplified by the plurality of amplifiers. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification