Point-to-multipoint digital radio frequency transport
DC CAFCFirst Claim
Patent Images
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 of digitized radio frequency signals between the digital host unit and the at least two digital remote units;
wherein the digital host unit digitally sums the digitized radio frequency signals received at the digital host unit.
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Accused Products
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.
219 Citations
81 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 of digitized radio frequency signals between the digital host unit and the at least two digital remote units; wherein the digital host unit digitally sums the digitized radio frequency signals received at the digital host unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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 of digitized radio frequency signals between the digital host unit and the at least two digital remote units; wherein the digital host unit digitally sums the digitized radio frequency signals received at the digital host unit. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. 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; digitally summing the multiple digital radio frequency signals together; and converting the summed multiple 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. - View Dependent Claims (26, 27)
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28. 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, using a shared analog-to-digital converter, the radio frequency signals to a digitized radio frequency spectrum; optically transmitting the digitized radio frequency spectrum output by the shared analog-to-digital converter 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. - View Dependent Claims (29, 30, 31, 32)
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33. 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.
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34. 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 of digitized radio frequency signals between the digital host unit and the at least two digital remote units; wherein the digital host unit digitally sums the digitized radio frequency signals received at the digital host unit. - View Dependent Claims (35)
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36. A digital radio frequency transport system, comprising:
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a digital host unit, wherein the digital host unit includes a channel summer to digitally sum digitized RF signals received at the digital host; 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.
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37. A first unit comprising:
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an interface to communicatively couple the first unit to a plurality of second units using at least one communication medium, wherein the plurality of second units are located remotely from the first unit; an analog-to-digital unit to digitize a downstream analog radio frequency signal produced for radiation from an antenna in order to produce downstream digital RF samples; a digital-to-analog unit to convert a stream of summed upstream digital RF samples to a replicated upstream analog radio frequency signal; and a digital summer to produce each of the summed upstream digital RF samples by digitally summing respective upstream digital RF samples received from the plurality of second units; wherein the upstream digital RF samples received from the plurality of second units have an associated resolution; wherein the digital summer has a resolution that is greater than the resolution associated with the digitized radio frequency signals being digitally summed; and wherein the first unit communicates at least a portion of the downstream digital RF samples to the plurality of second units. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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45. A system for bi-directional radio frequency signal distribution system comprising:
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a host unit; and a plurality of other units communicatively coupled to the host unit using at least one communication medium, wherein the plurality of other units are located remotely from the host unit; wherein the host unit comprises; an interface to communicatively couple the host unit to the plurality of other units using the at least one communication medium; an analog-to-digital unit configured to digitize an original downstream analog radio frequency signal produced for radiation from a respective antenna in order to produce downstream digital RF samples; a digital-to-analog unit configured to convert a stream of summed upstream digital RF samples to a replicated upstream analog radio frequency signal; and a digital summer to produce each of the summed upstream digital RF samples by digitally summing respective upstream digital RF samples received from the plurality of other units; wherein the host unit communicates at least a portion of the downstream digital RF samples to the plurality of other units; wherein each of the other units digitizes an original upstream analog radio frequency signal produced for radiation from a respective antenna in order to produce the upstream digital RF samples, at least a portion of which are communicated to the host unit, wherein the upstream digital RF samples have an associated resolution; and wherein each of the other units convert the downstream digital RF samples received thereat to a replicated downstream analog radio frequency signal; and wherein the digital summer has a resolution that is greater than the resolution associated with the upstream digital RF samples being summed. - View Dependent Claims (46, 47, 48, 49, 50)
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51. A method comprising, at a first unit that is communicatively coupled to a plurality of second units, performing the following:
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digitizing a downstream analog radio frequency signal produced for radiation from an antenna in order to produce downstream digital RF samples; communicating at least a portion of the downstream digital RF samples to the plurality of second units, wherein the plurality of second units are located remotely from the first unit; receiving from the plurality of second units respective upstream digital RF samples, wherein the upstream digital RF samples have an associated resolution; digitally summing respective upstream digital RF samples received from the plurality of second units in order to produce each of a stream of summed upstream digital RF samples, wherein the respective upstream digital RF samples received from the plurality of second units are digitally summed with a resolution greater than the resolution of the upstream digital RF samples being summed; converting the stream of summed upstream digital RF samples to a replicated upstream analog radio frequency signal.
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52. A first unit comprising:
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an interface configured to communicatively couple the first unit to a plurality of second units using at least one communication medium, wherein the first unit is configured to use the interface to communicate to the plurality of second units downstream digital RF samples produced from a downstream analog radio frequency signal produced for radiation from an antenna and wherein the plurality of second units are located remotely from the first unit; a power distribution interface configured to provide power to at least one of the plurality of second units; and a digital-to-analog unit configured to convert a stream of summed upstream digital RF samples to a replicated upstream analog radio frequency signal; and wherein each of the summed upstream digital RF samples is produced by digitally summing respective upstream digital RF samples received from the plurality of second units; wherein the upstream digital RF samples received from the plurality of second units have an associated resolution; and wherein the upstream digital RF samples are digitally summed with a resolution that is greater than the resolution associated with the upstream digital RF samples being digitally summed. - View Dependent Claims (53, 54, 55, 56, 57)
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58. A system for bi-directional radio frequency signal distribution comprising:
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a host unit; and a plurality of other units communicatively coupled to the host unit using at least one communication medium, wherein the plurality of other units are located remotely from the host unit; wherein the host unit comprises; an interface configured to communicatively couple the host unit to the plurality of other units using the at least one communication medium, wherein the host unit is configured to use the interface to communicate to the plurality of other units downstream digital RF samples produced from an original downstream analog radio frequency signal produced for radiation from a respective antenna; a power distribution interface to provide power to at least one of the plurality of other units; a digital-to-analog unit configured to convert a stream of summed upstream digital RF samples to a replicated upstream analog radio frequency signal; and a digital summer to produce each of the summed upstream digital RF samples by digitally summing respective upstream digital RF samples received from the plurality of other units; wherein each of the other units digitizes an original upstream analog radio frequency signal produced for radiation from a respective antenna in order to produce the upstream digital RF samples, at least a portion of which are communicated to the host unit, wherein the upstream digital RF samples have an associated resolution; wherein the digital summer has a resolution that is greater than the resolution of the upstream digital RF samples being summed; wherein each of the other units convert the downstream digital RF samples received thereat to a replicated downstream analog radio frequency signal; and wherein at least one of the other units is at least partially powered by power received from the host unit. - View Dependent Claims (59, 60, 61, 62, 63)
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64. A method comprising, at a first unit that is communicatively coupled to a plurality of second units, performing the following:
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digitizing an original downstream analog radio frequency signal produced for radiation from an antenna in order to produce downstream digital RF samples; communicating at least a portion of the downstream digital RF samples to the plurality of second units, wherein the plurality of second units are located remotely from the first unit; receiving from the plurality of second units respective upstream digital RF samples, the upstream digital RF samples having an associated resolution; digitally summing respective upstream digital RF samples received from the plurality of second units in order to produce each of a stream of summed upstream digital RF samples, wherein the respective upstream digital RF samples received from the plurality of second units are digitally summed with a resolution greater than the resolution of the upstream digital RF samples being summed; converting the stream of summed upstream digital RF samples to a replicated upstream analog radio frequency signal; and distributing power to at least one of the second units.
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65. A first unit comprising:
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an interface to communicatively couple the first unit to a plurality of second units using at least one communication medium, wherein the first unit uses the interface to communicate to the plurality of second units downstream digital RF samples produced from an original downstream analog radio frequency signal; and a digital-to-analog unit to convert a stream of summed upstream digital RF samples to a replicated upstream analog radio frequency; and wherein each of the summed upstream digital RF samples is produced by digitally summing respective upstream digital RF samples received from the plurality of second units; wherein the digital-to-analog unit comprises a digital-to-analog converter, a first mixer, and a second mixer; wherein the stream of summed upstream digital RF samples is converted to an analog signal by the digital-to-analog converter; wherein a signal derived from the analog signal is mixed with a first reference signal by the first mixer; wherein a signal derived from a signal output by the first mixer is mixed with a second reference signal by the second mixer; and wherein the second reference signal is generated by frequency dividing the first reference signal. - View Dependent Claims (66, 67, 68, 69)
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70. A system for bi-directional radio frequency signal distribution comprising:
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a host unit; and a plurality of other units communicatively coupled to the host unit using at least one communication medium; wherein the host unit comprises; an interface to communicatively couple the host unit to the plurality of other units using the at least one communication medium, wherein the host unit uses the interface to communicate to the plurality of other units downstream digital RF samples produced from an original downstream analog radio frequency signal; and a digital-to-analog unit to convert a stream of summed upstream digital RF samples to a replicated upstream analog radio frequency; and wherein each of the summed upstream digital RF samples is produced by digitally summing respective upstream digital RF samples received from the plurality of other units; wherein the digital-to-analog unit comprises a digital-to-analog converter, a first mixer, and a second mixer; wherein the stream of summed upstream digital RF samples is converted to an analog signal by the digital-to-analog converter; wherein a signal derived from the analog signal is mixed with a first reference signal by the first mixer; wherein a signal derived from a signal output by the first mixer is mixed with a second reference signal by the second mixer; wherein the second reference signal is generated by frequency dividing the first reference signal; wherein each of the other units digitizes an original upstream analog radio frequency in order to produce the upstream digital RF samples, at least a portion of which are communicated to the host unit; wherein each of the other units convert the downstream digital RF samples received thereat to a replicated downstream analog radio frequency; and wherein at least one of the other units is at least partially powered by power received from the host unit. - View Dependent Claims (71, 72, 73)
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74. A method comprising, at a first unit that is communicatively coupled to a plurality of second units, performing the following:
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digitizing an original downstream analog radio frequency signal in order to produce downstream digital RF samples; communicating at least a portion of the downstream digital RF samples to the plurality of second units; receiving from the plurality of second units respective upstream digital RF samples; digitally summing respective upstream digital RF samples received from the plurality of second units in order to produce each of a stream of summed upstream digital RF samples; converting the stream of summed upstream digital RF samples to an analog signal; mixing a signal derived from the analog signal is with a first reference signal to produce a first mixed signal; mixing a signal derived from a first mixed signal with a second reference signal; and generating the second reference signal by frequency dividing the first reference signal.
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75. A first unit comprising:
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an interface to communicatively couple the first unit to the plurality of second units using at least one communication medium; an analog-to-digital unit to digitize an original downstream analog radio frequency signal in order to produce downstream digital RF samples; a digital-to-analog unit to convert a stream of summed upstream digital RF samples to a replicated upstream analog radio frequency; and wherein the first unit produces each of the summed upstream digital RF samples by digitally summing respective upstream digital RF samples received from the plurality of second units; and wherein the first unit communicates at least a portion of the downstream digital RF samples to the plurality of second units; wherein sample rates used by the host unit and the other units are locked together. - View Dependent Claims (76, 77)
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78. A system for bi-directional radio frequency signal distribution system comprising:
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a host unit; and a plurality of other units communicatively coupled to the host unit using at least one communication medium; wherein the host unit comprises; an interface to communicatively couple the host unit to the plurality of other units using the at least one communication medium; an analog-to-digital unit to digitize an original downstream analog radio frequency signal in order to produce downstream digital RF samples; and a digital-to-analog unit to convert summed upstream digital RF samples to a replicated upstream analog radio frequency; and wherein the host unit produces each of the summed upstream digital RF samples by digitally summing respective upstream digital RF samples received from the plurality of other units; and wherein the host unit communicates at least a portion of the downstream digital RF samples to the plurality of other units; wherein each of the other units digitizes an original upstream analog radio frequency in order to produce the upstream digital RF samples, at least a portion of which are communicated to the host unit; wherein each of the other units convert the downstream digital RF samples received thereat to a replicated downstream analog radio frequency; and wherein sample rates used by the host unit and the other units are locked together. - View Dependent Claims (79, 80)
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81. A first unit comprising:
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means for communicatively coupling the first unit to a plurality of second units; means for digitizing an original downstream analog radio frequency signal in order to produce downstream digital RF samples; means for communicating at least a portion of the downstream digital RF samples to the plurality of second units; means for receiving from the plurality of second units respective upstream digital RF samples, the upstream digital RF samples having an associated resolution; means for digitally summing respective upstream digital RF samples received from the plurality of second units in order to produce each of a stream of summed upstream digital RF samples, wherein the means for digitally summing has a resolution that is greater than the resolution of the upstream digital RF samples being summed; and means for converting the stream of summed upstream digital RF samples to a replicated upstream analog radio frequency.
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Specification