Optical fiber-based distributed antenna systems, components, and related methods for calibration thereof
First Claim
1. A method of calibrating a wireless communication system, comprising:
- determining a total downlink loss for at least one communication downlink configured to transport electrical radio frequency (RF) signals from at least one base transceiver station (BTS) to a downlink BTS interface and to transport Radio-over-Fiber (RoF) signals converted by at least one optical interface module (01M) from the electrical RF signals to at least one remote antenna unit (RAU);
determining a downlink BTS loss from the total downlink loss;
calibrating a downlink BTS calibration gain in the downlink BTS interface based on the downlink BTS loss;
calibrating at least one RAU calibration gain in the at least one RAU as the total downlink loss minus the downlink BTS loss; and
injecting at least one downlink calibration signal over the at least one communication downlink,wherein the controller is configured to calibrate the at least one RAU calibration gain in the at least one RAU by setting the at least one RAU calibration gain in at least one attenuator in the at least one RAU.
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Accused Products
Abstract
Optical fiber-based wireless systems and related components and methods are disclosed. The systems support radio frequency (RF) communications with clients over optical fiber, including Radio-over-Fiber (RoF) communications. The systems may be provided as part of an indoor distributed antenna system to provide wireless communication services to clients inside a building or other facility. The communications can be distributed between a head end unit (HEU) that receives carrier signals from one or more service or carrier providers and converts the signals to RoF signals for distribution over optical fibers to end points, which may be remote antenna units (RAUs). In one embodiment, calibration of communication downlinks and communication uplinks is performed to compensate for signal strength losses in the system.
907 Citations
17 Claims
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1. A method of calibrating a wireless communication system, comprising:
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determining a total downlink loss for at least one communication downlink configured to transport electrical radio frequency (RF) signals from at least one base transceiver station (BTS) to a downlink BTS interface and to transport Radio-over-Fiber (RoF) signals converted by at least one optical interface module (01M) from the electrical RF signals to at least one remote antenna unit (RAU); determining a downlink BTS loss from the total downlink loss; calibrating a downlink BTS calibration gain in the downlink BTS interface based on the downlink BTS loss; calibrating at least one RAU calibration gain in the at least one RAU as the total downlink loss minus the downlink BTS loss; and injecting at least one downlink calibration signal over the at least one communication downlink, wherein the controller is configured to calibrate the at least one RAU calibration gain in the at least one RAU by setting the at least one RAU calibration gain in at least one attenuator in the at least one RAU. - View Dependent Claims (2, 3)
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4. A method of calibrating a wireless communication system, comprising:
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determining a total downlink loss for at least one communication downlink configured to transport electrical radio frequency (RF) signals from at least one base transceiver station (BTS) to a downlink BTS interface and to transport Radio-over-Fiber (RoF) signals converted by at least one optical interface module (OIM) from the electrical RF signals to at least one remote antenna unit (RAU); determining a downlink BTS loss from the total downlink loss; calibrating a downlink BTS calibration gain in the downlink BTS interface based on the downlink BTS loss for a plurality of BTS bands communicated to the at least one BTS; and automatically calibrating at least one RAU calibration gain in the at least one RAU for the plurality of BTS bands as the total downlink loss minus the downlink BTS loss, wherein the controller is configured to calibrate the at least one RAU calibration gain in the at least one RAU by setting the at least one RAU calibration gain in at least one attenuator. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A method of calibrating a wireless communication system, comprising:
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determining a total downlink loss for at least one communication downlink configured to transport electrical radio frequency (RF) signals from at least one base transceiver station (BTS) to a downlink BTS interface and to transport Radio-over-Fiber (RoF) signals converted by at least one of a plurality of optical interface modules (OIMs) from the electrical RF signals to at least one remote antenna unit (RAU); determining a downlink BTS loss from the total downlink loss; automatically calibrating a downlink BTS calibration gain in the downlink BTS interface based on the downlink BTS loss; calibrating at least one RAU calibration gain in the at least one RAU as the total downlink loss minus the downlink BTS loss; and determining a total uplink loss for at least one communication uplink configured to transport RoF signals from the at least one RAU converted to electrical RF signals by the at least one OIM to an uplink BTS interface. - View Dependent Claims (12, 13)
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14. A method of calibrating a wireless communication system, comprising:
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determining a total downlink loss for at least one communication downlink configured to transport electrical radio frequency (RF) signals from at least one base transceiver station (BTS) to a downlink BTS interface and to transport Radio-over-Fiber (RoF) signals converted by at least one optical interface module (OIM) from the electrical RF signals to at least one remote antenna unit (RAU); determining a downlink BTS loss from the total downlink loss; calibrating a downlink BTS calibration gain in the downlink BTS interface based on the downlink BTS loss; calibrating at least one RAU calibration gain in the at least one RAU as the total downlink loss minus the downlink BTS loss; determining a total uplink loss for at least one communication uplink configured to transport RoF signals from the at least one RAU converted to electrical RF signals by the at least one OIM to an uplink BTS interface; determining an uplink BTS loss from the total uplink loss; and calibrating an uplink BTS calibration gain in the uplink BTS interface based on the uplink BTS loss. - View Dependent Claims (15, 16, 17)
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Specification