Back to results
US 6,704,545 B1Granted
Point-to-multipoint digital radio frequency transport
AssigneeADC Telecommunications, Inc.
InventorPhilip M. Wala
Life of this patent
Estimating the term…
Abstract
A digital radio frequency transport system that performs bi-directional simultaneous digital radio frequency distribution is provided. The transport system includes a digital host unit and at least two digital remote units coupled to the digital host unit. The bi-directional simultaneous digital radio frequency distribution is performed between the digital host unit and the at least two digital remote units.
Claims79
A digital radio frequency transport system, comprising:
- a digital host unit;
- and
- at least two digital remote units coupled to the digital host unit, wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units;
- wherein the digital host unit includes:
- at least two optical receivers each coupled to one of the at least two digital remote units;
- at least two clock and bit recovery circuits each coupled to an output of one of the at least two optical receivers;
- and
- at least two demultiplexers each coupled to an output of one of the at least two clock and bit recovery circuits.
5 more elements
A digital radio frequency transport system, comprising:
- a digital host unit, and
- at least two digital remote units coupled to the digital host unit, wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units;
- wherein the at least two digital remote units each comprise:
- an optical receiver;
- a clock and bit recovery circuit coupled to an output of the optical receiver;
- a demultiplexer coupled to an output of the clock and bit recovery circuit;
- a digital to radio frequency converter coupled to the output of the demultiplexer;
- a duplexer coupled to an output of the digital to radio frequency converter;
- and
- a main radio frequency antenna coupled to an output of the duplexer.
7 more elements
A digital radio frequency transport system, comprising:
- a digital host unit;
- at least two digital remote units coupled to the digital host unit, wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units;
- and
- a digital expansion unit coupled to the digital host unit, wherein the digital expansion unit contains circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the digital remote unit;
- wherein the digital expansion unit comprises:
- an optical receiver;
- a clock and bit recovery circuit coupled to an output of the optical receiver;
- and
- a plurality of optical transmitters coupled to an output of the clock and bit recovery circuit, wherein the optical transmitters are each coupleable to a digital remote unit or a digital expansion unit.
6 more elements
A digital radio frequency transport system, comprising:
- a digital host unit;
- at least two digital remote units coupled to the digital host unit, wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units;
- and
- a digital expansion unit coupled to the digital host unit, wherein the digital expansion unit contains circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the digital remote unit;
- wherein the digital expansion unit comprises:
- a plurality of optical receivers;
- a plurality of clock and bit recovery circuits each coupled to an output of one of the plurality of optical receivers;
- a plurality of demultiplexers each coupled to an output of one of the clock and bit recovery circuits;
- a summer coupled to an output of each of the plurality of demultiplexers;
- a multiplexer coupled to an output of the field programmable gate array;
- and
- an optical transmitter coupled to an output of the multiplexer.
9 more elements
A digital radio frequency transport system, comprising:
- a digital host unit;
- at least one digital expansion unit coupled to the digital host unit;
- and
- at least two digital remote units, each coupled to one of the digital host unit and the digital expansion unit, wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units;
- wherein the at least one digital expansion unit comprises:
- an optical receiver;
- a clock and bit recovery circuit coupled to an output of the optical receiver;
- and
- a plurality of optical transmitters coupled to an output of the clock and bit recovery circuit, wherein the optical transmitters are each coupleable to a digital remote unit or a digital expansion unit.
6 more elements
A digital radio frequency transport system, comprising:
- a digital host unit;
- at least one digital expansion unit coupled to the digital host unit;
- and
- at least two digital remote units, each coupled to one of the digital host unit and the digital expansion unit, wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units;
- wherein the at least one digital expansion unit comprises:
- a plurality of optical receivers;
- a plurality of clock and bit recovery circuits each coupled to an output of one of the plurality of optical receivers;
- a plurality of demultiplexers each coupled to an output of one of the clock and bit recovery circuits;
- a summer coupled to an output of each of the plurality of demultiplexers;
- a multiplexer coupled to an output of the field programmable gate array;
- and
- an optical transmitter coupled to an output of the multiplexer.
9 more elements
A digital radio frequency transport system, comprising:
- a digital host unit;
- at least one digital expansion unit coupled to the digital host unit;
- and
- at least two digital remote units, each coupled to one of the digital host unit and the digital expansion unit, wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units;
- wherein the digital host unit includes:
- at least two optical receivers each coupled to one of the at least two digital expansion units;
- at least two clock and bit recovery circuits each coupled to an output of one of the at least two optical receivers;
- and
- at least two demultiplexers each coupled to an output of one of the at least two clock and bit recovery circuits.
6 more elements
A method of performing multipoint-to-point digital radio frequency transport, the method comprising:
- receiving analog radio frequency signals at multiple digital remote units;
- converting the analog radio frequency signals to digital radio frequency signals at each of the digital remote units;
- optically transmitting the digital radio frequency signals from each of the digital remote units to a digital host unit;
- receiving the multiple digital radio frequency signals at the digital host unit;
- summing the multiple digital radio frequency signals together;
- and
- converting the digital radio frequency signals back to analog radio frequency signals and transmitting the signals to a wireless interface device for further transmission to a switched telephone network;
- wherein the digital host unit includes:
- an optical receiver;
- a clock and bit recovery circuit coupled to the optical receiver;
- and
- a demultiplexer coupled to the clock and bit recovery circuit.
9 more elements
A method of performing point-to-multipoint digital radio frequency transport, the method comprising:
- receiving radio frequency signals at a digital host unit;
- converting the radio frequency signals to a digitized radio frequency spectrum;
- optically transmitting the digitized radio frequency spectrum to a plurality of digital remote units;
- receiving the digitized radio frequency spectrum at the plurality of digital remote units;
- converting the digitized radio frequency spectrum to analog radio frequency signals;
- and
- transmitting the analog radio frequency signals via a main radio frequency antenna at each of the plurality of digital remote units;
- wherein the digital host unit includes:
- an optical receiver;
- a clock and bit recovery circuit coupled to the optical receiver;
- and
- a demultiplexer coupled to the clock and bit recovery circuit.
9 more elements
A method of performing point-to-multipoint digital radio frequency transport, the method comprising:
- receiving radio frequency signals at a digital host unit;
- converting the radio frequency signals to a digitized radio frequency spectrum;
- optically transmitting a first digitized radio frequency spectrum to a first plurality of digital remote units and at least one digital expansion unit;
- receiving the digitized radio frequency spectrum at the first plurality of digital remote units;
- converting the digitized radio frequency spectrum to analog radio frequency signals at each of the first plurality of digital remote units;
- receiving the digital radio frequency signals at the at least one digital expansion unit;
- optically transmitting a second digitized radio frequency spectrum to a second plurality of digital remote units;
- receiving the second digitized radio frequency spectrum at the second plurality of digital remote units;
- converting the second digitized radio frequency spectrum to analog radio frequency signals at each of the second plurality of digital remote units;
- and
- transmitting the analog radio frequency signals via a main radio frequency antenna at each of the first and second plurality of digital remote units;
- wherein the digital host unit includes:
- an optical receiver;
- a clock and bit recovery circuit coupled to the optical receiver;
- and
- a demultiplexer coupled to the clock and bit recovery circuit.
13 more elements
A digital radio frequency transport system, comprising:
- a digital host unit;
- and
- at least two digital remote units coupled to the digital host unit, wherein the at least two digital remote units each include:
- a main radio frequency antenna;
- a duplexer coupled to the main radio frequency antenna which receives radio frequency signals in the reverse path and transmits radio frequency signals in the forward path;
- a radio frequency to digital converter coupled to the duplexer in the reverse path;
- a digital to radio frequency converter coupled to the duplexer in the forward path;
- a multiplexer chip set coupled to the radio frequency to digital converter in the reverse path and the digital to radio frequency converter in the forward path;
- an optical transmitter coupled to an output of the multiplexer chip set;
- and
- an optical receiver coupled to an input of the multiplexer chip set;
- wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units;
- wherein the digital host unit includes:
- at least two optical receivers each coupled to one of the at least two digital remote units;
- at least two clock and bit recovery circuits each coupled to an output of one of the at least two optical receivers, and
- at least two demultiplexers each coupled to an output of one of the at least two clock and bit recovery circuits.
13 more elements
A digital radio frequency transport system, comprising:
- a digital host unit, wherein the digital host unit includes:
- a radio frequency to digital converter;
- a multiplexer coupled to an output of the radio frequency to digital converter;
- a plurality of optical transmitters coupled to an output of the multiplexer
- a first local oscillator coupled to an input of the radio frequency to digital converter;
- a reference oscillator coupled to an input of the first local oscillator;
- a second local oscillator coupled to an output of the reference oscillator;
- a digital to radio frequency converter coupled to an output of the second local oscillator;
- a channel summer coupled to an input of the digital to radio frequency converter;
- a plurality of demultiplexers coupled to the channel summer;
- a plurality of clock and bit recovery circuits, wherein each of the plurality of clock and bit recovery circuits are coupled to one of each of the plurality of demultiplexers;
- and
- a plurality of optical receivers, wherein each of the plurality of optical receivers are coupled to one of each of the plurality of clock and bit recovery circuits;
- at least two digital remote units each coupled to one of the plurality of optical receivers, wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units.
11 more elements
A digital radio frequency transport system, comprising:
- a digital host unit, wherein the digital host unit includes a channel summer;
- at least one digital expansion unit coupled to the digital host unit;
- and
- at least two digital remote units coupled to the digital host unit, wherein the digital host unit includes shared circuitry that performs bi-directional simultaneous digital radio frequency distribution between the digital host unit and the at least two digital remote units;
- wherein the digital host unit includes:
- an optical receiver;
- a clock and bit recovery circuit coupled to the optical receiver;
- and
- a demultiplexer coupled to the clock and bit recovery circuit.
6 more elements
Dependencies are inferred from the claim text.