Digital radio frequency transceiver system and method
First Claim
1. A radio frequency transceiver, comprising:
- a power amplifier which receives a digital signal, located proximate to an antenna system, configured to;
generate a power amplified radio frequency signal having at least an output amplitude modulated dependent on the digital signal, andto transmit the power amplified radio frequency signal having at least the output amplitude modulated dependent on the digital signal through the antenna system;
a signal receiver, located proximate to the antenna system, configured to receive a radio frequency signal from the antenna system; and
a base, located remotely from the antenna system, configured to interconnect with a physical communications link providing a digital signal to the power amplifier, and receive an analog representation of the received radio frequency signal from the signal receiver,the base processing a source signal to produce the digital signal, and processing the analog representation of the received radio frequency signal to produce a digital representation of the analog representation.
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Accused Products
Abstract
A transceiver architecture for wireless base stations wherein a broadband radio frequency signal is carried between at least one tower-mounted unit and a ground-based unit via optical fibers, or other non-distortive media, in either digital or analog format. Each tower-mounted unit (for both reception and transmission) has an antenna, analog amplifier and an electro-optical converter. The ground unit has ultrafast data converters and digital frequency translators, as well as signal linearizers, to compensate for nonlinear distortion in the amplifiers and optical links in both directions. In one embodiment of the invention, at least one of the digital data converters, frequency translators, and linearizers includes superconducting elements mounted on a cryocooler.
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Citations
20 Claims
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1. A radio frequency transceiver, comprising:
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a power amplifier which receives a digital signal, located proximate to an antenna system, configured to; generate a power amplified radio frequency signal having at least an output amplitude modulated dependent on the digital signal, and to transmit the power amplified radio frequency signal having at least the output amplitude modulated dependent on the digital signal through the antenna system; a signal receiver, located proximate to the antenna system, configured to receive a radio frequency signal from the antenna system; and a base, located remotely from the antenna system, configured to interconnect with a physical communications link providing a digital signal to the power amplifier, and receive an analog representation of the received radio frequency signal from the signal receiver, the base processing a source signal to produce the digital signal, and processing the analog representation of the received radio frequency signal to produce a digital representation of the analog representation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of transmitting and receiving radio frequency signals through an antenna system, comprising:
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providing an antenna system, a power amplifier located proximate to the antenna system, which receives a digital signal and produces a power amplified radio frequency signal having at least an amplitude dependent on the digital signal, for transmission through the antenna system, a signal receiver located proximate to the antenna system, and a base, located remotely from the antenna system; interconnecting the power amplifier and the base with a physical communications link configured to communicate using a digital signal, and the signal receiver and the base with a physical communications link configured to communicate an analog representation of a received radio frequency signal; processing, at the base, a source signal to produce the digital signal; transmitting the power amplified radio frequency signal from the antenna system corresponding to the digital signal received by the power amplifier from the base; receiving the analog representation of the received radio frequency signal by the base from the signal receiver corresponding to a radio frequency signal received by the antenna system; and processing, at the base, the received analog representation of the received radio frequency signal to produce a digital representation of the received analog representation of the received radio frequency signal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A radio frequency transceiver, comprising:
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a power amplifier system having an amplifier output, configured to receive a digital signal, and to produce a power amplified radio frequency emission having at least an amplitude dependent on the digital signal from the amplifier output corresponding to an analog representation of information in the digital signal, from a co-located antenna system; a signal receiver system, co-located with the antenna system, configured to receive a radio frequency signal from the antenna system and to produce an analog radio frequency output signal corresponding to the received radio frequency signal; and a base system, located remotely from the antenna system, configured to; process a source signal to produce the digital signal; interconnect with at least one physical communications link configured to communicate the digital signal to the power amplifier system; receive the analog radio frequency output signal from the signal receiver system; and process the received analog radio frequency output signal to produce a digital representation of the analog radio frequency output signal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification