Point-to-multipoint digital radio frequency transport
First Claim
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1. 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.
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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.
310 Citations
79 Claims
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1. A digital radio frequency transport system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
a main radio frequency antenna;
a duplexer coupled to the main radio frequency antenna;
a radio frequency to digital converter coupled to an output of the duplexer;
a multiplexer coupled to an output of the radio frequency to digital converter; and
an optical transmitter coupled to an output of the multiplexer.
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18. A digital radio frequency transport system, comprising:
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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. - View Dependent Claims (19, 20, 21, 22, 23)
a duplexer coupled to the main radio frequency antenna;
a radio frequency to digital converter coupled to an output of the duplexer;
a multiplexer coupled to an output of the radio frequency to digital converter; and
an optical transmitter coupled to an output of the multiplexer.
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20. The system of claim 19, wherein the digital to radio frequency converter includes a digital to analog converter.
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21. The system of claim 19, wherein the radio frequency converter includes an analog to digital converter.
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22. The system of claim 19, wherein the at least two digital remote units each further comprise a programmable logic circuit coupled to an output of the radio frequency to digital converter and a reference oscillator coupled between the programmable logic circuit and the clock and bit recovery circuit, wherein the programmable logic circuit monitors the system for error conditions and reports error modes.
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23. The system of claim 22, wherein the at least two digital remote units each further comprise a synthesizer circuit coupled to an output of the programmable logic device and a first and a second local oscillator coupled to a first and a second output, respectively, of the synthesizer.
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24. A digital radio frequency transport system, comprising:
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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. - View Dependent Claims (25, 26)
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27. A digital radio frequency transport system, comprising:
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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. - View Dependent Claims (28, 29, 30)
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31. A digital radio frequency transport system, comprising:
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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. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 49, 50, 51, 52, 53)
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42. A digital radio frequency transport system, comprising:
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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. - View Dependent Claims (43, 44, 45)
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46. A digital radio frequency transport system, comprising:
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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. - View Dependent Claims (47, 48)
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54. A method of performing multipoint-to-point digital radio frequency transport, the method comprising:
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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. - View Dependent Claims (55, 56)
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57. A method of performing point-to-multipoint digital radio frequency transport, the method comprising:
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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. - View Dependent Claims (58, 59, 60, 61)
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62. A method of performing point-to-multipoint digital radio frequency transport, the method comprising:
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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.
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63. A digital radio frequency transport system, comprising:
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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. - View Dependent Claims (64, 65, 66, 67, 68, 69, 70)
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71. A digital radio frequency transport system, comprising:
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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. - View Dependent Claims (72, 73, 74, 75, 76, 77, 78)
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 an 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.
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73. The system of claim 72, wherein the at least two digital remote units each further comprise:
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a duplexer coupled to the main radio frequency antenna;
a radio frequency to digital converter coupled to an output of the duplexer;
a multiplexer coupled to an output of the radio frequency to digital converter; and
an optical transmitter coupled to an output of the multiplexer.
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74. The system of claim 73, wherein the digital to radio frequency converter includes a digital to analog converter.
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75. The system of claim 73, wherein the radio frequency converter includes an analog to digital converter.
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76. The system of claim 73, wherein the at least two digital remote units each further comprise a programmable logic circuit coupled to an output of the radio frequency to digital converter and a reference oscillator coupled between the programmable logic circuit and the clock and bit recovery circuit, wherein the programmable logic circuit monitors the system for error conditions and reports error modes.
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77. The system of claim 76, wherein the at least two digital remote units each further comprise a synthesizer circuit coupled to an output of the programmable logic device and a first and a second local oscillator coupled to a first and a second output, respectively, of the synthesizer.
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78. The system of claim 71, wherein the at least two digital remote units each comprise:
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a main radio frequency antenna;
a duplexer coupled to the main radio frequency antenna;
a radio frequency to digital converter coupled to an output of the duplexer;
a multiplexer coupled to an output of the radio frequency to digital converter; and
an optical transmitter coupled to an output of the multiplexer.
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79. A digital radio frequency transport system, comprising:
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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.
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Specification