Digital radio frequency transceiver system and method

摘要

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.

主权项

1. A communication system, comprising:
an optoelectronic receiver configured to receive an optic signal conveyed from an electrooptic transmitter to an optic communication medium, comprising an analog domain representation of a radio frequency signal having frequencies above 698 MHz modulating the optic signal, and to produce an electrical analog domain signal corresponding to radio frequency signal frequencies above 698 MHz, including at least one intermodulation distortion product of the radio frequency signal; a digitizer configured to quantize the electrical analog domain signal to a digital stream having a sampling rate of at least 1.4 gigasamples per second; and a digital signal processor configured receive the digital stream and digitally reduce a representation of an amplitude of at least one intermodulation distortion product, dependent on a model of the intermodulation distortion properties of the at least one of the optoelectronic receiver and the electrooptic transmitter, and to produce a processed signal output.