System and method for calibration of a distributed amplifier system
First Claim
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1. A method, comprising:
- measuring RF losses at multiple frequencies in a first direction between a head end and a coverage node in a site by measuring output power from the head end and comparing that to input power on a plurality of coverage nodes as received from the coverage nodes for downlink loss;
generating gains and output power limits for each amplifier in each coverage node and the head end based on the measured RF losses;
further adjusting the generated gains and output power limits based on downlink signal strength of cellular signals at a donor antenna, the type of antenna used, the cable type, and the length of the RF cable going to each antenna;
monitoring the measured RF losses over time; and
further adjusting the generated gains and output power limits based on the monitoring.
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Abstract
A system and method in a distributed amplifier system for correcting for RF losses between head end and coverage nodes by measuring RF losses in both directions; generating gains for amplifiers in both the head ends and coverage nodes; generating maximum output power limits; and adjusting the generated gains and output power limits based on downlink signal strength of cellular signals at a donor antenna.
24 Citations
16 Claims
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1. A method, comprising:
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measuring RF losses at multiple frequencies in a first direction between a head end and a coverage node in a site by measuring output power from the head end and comparing that to input power on a plurality of coverage nodes as received from the coverage nodes for downlink loss; generating gains and output power limits for each amplifier in each coverage node and the head end based on the measured RF losses; further adjusting the generated gains and output power limits based on downlink signal strength of cellular signals at a donor antenna, the type of antenna used, the cable type, and the length of the RF cable going to each antenna; monitoring the measured RF losses over time; and further adjusting the generated gains and output power limits based on the monitoring. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A distributed amplifier system, comprising:
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a head end; and a plurality of coverage nodes distributed in a site and communicatively coupled to the head end; each coverage node including an amplifier and the head end including an amplifier; wherein the head end amplifier is configured to measure RF losses at multiple frequencies in a first direction between the head end and the coverage nodes by measuring output power from the head end and comparing that to input power on a plurality of coverage nodes as received from the coverage nodes for downlink loss; generate gains and output power limits for each amplifier in each coverage node and the head end based on the measured RF losses; further adjust the generated gains and output power limits based on downlink signal strength of cellular signals at a donor antenna, the type of antenna used, the cable type, and the length of the RF cable going to each antenna; a characterization unit configured to monitor the measured RF losses over time and wherein the head end amplifier is further configured to adjust the generated gains and output power limits based on the monitoring. - View Dependent Claims (9, 10, 11)
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12. A head end, comprising:
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a modem configured to communicatively couple to a plurality of nodes distributed in a site; and an amplifier; wherein each coverage node includes an amplifier; wherein the head end amplifier is configured to measure RF losses at multiple frequencies in a first direction between the head end and the coverage nodes by measuring output power from the head end and comparing that to input power on a plurality of coverage nodes as received from the coverage nodes via the modem for downlink loss; generate gains and output power limits for each amplifier in each coverage node and the head end based on the measured RF losses; and further adjust the generated gains and output power limits based on downlink signal strength of cellular signals at a donor antenna and locations of antennas relative to each other; and a characterization unit configured to monitor the measured RF losses over time and wherein the head end amplifier is further configured to adjust the generated gains and output power limits based on the monitoring. - View Dependent Claims (13, 14, 15)
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16. A coverage node, comprising:
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a modem configured to communicatively couple to a plurality of nodes distributed in a site; and an amplifier; wherein amplifier is configured to measure RF losses at multiple frequencies in a first direction between the head end and the coverage nodes by measuring output power from the head end and comparing that to input power on a plurality of coverage nodes as received from the coverage nodes via the modem for downlink loss; generate gains and output power limits for each amplifier in each coverage node and the head end based on the measured RF losses; and further adjust the generated gains and output power limits based on downlink signal strength of cellular signals at a donor antenna and locations of antennas relative to each other.
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Specification