OPTICAL FIBER-BASED DISTRIBUTED ANTENNA SYSTEMS, COMPONENTS, AND RELATED METHODS FOR CALIBRATION THEREOF
First Claim
1. A wireless communication system, comprising:
- a downlink base transceiver station (BTS) interface configured to receive downlink electrical radio frequency (RF) signals from at least one BTS;
at least one optical interface module (OIM) configured to;
receive and convert the downlink electrical RF signals from the downlink BTS interface into downlink Radio-over-Fiber (RoF) signals on at least one communication downlink; and
receive and convert uplink RoF signals from at least one remote antenna unit (RAU) into uplink electrical RF signals on at least one communication uplink;
an uplink BTS interface configured to receive and communicate the uplink electrical RF signals from the at least one communication uplink to the at least one BTS; and
a controller configured to;
inject at least one calibration signal over the at least one communication downlink;
calibrate at least one downlink gain in the at least one communication downlink based on a loss incurred in the at least one calibration signal in the at least one communication downlink;
cause the at least one calibration signal to be switched from the at least one communication downlink to the at least one communication uplink; and
calibrate at least one uplink gain in the at least one communication uplink based on a loss incurred in the at least one calibration signal in the at least one communication uplink.
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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 (IDAS) 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.
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Citations
23 Claims
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1. A wireless communication system, comprising:
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a downlink base transceiver station (BTS) interface configured to receive downlink electrical radio frequency (RF) signals from at least one BTS; at least one optical interface module (OIM) configured to; receive and convert the downlink electrical RF signals from the downlink BTS interface into downlink Radio-over-Fiber (RoF) signals on at least one communication downlink; and receive and convert uplink RoF signals from at least one remote antenna unit (RAU) into uplink electrical RF signals on at least one communication uplink; an uplink BTS interface configured to receive and communicate the uplink electrical RF signals from the at least one communication uplink to the at least one BTS; and a controller configured to; inject at least one calibration signal over the at least one communication downlink; calibrate at least one downlink gain in the at least one communication downlink based on a loss incurred in the at least one calibration signal in the at least one communication downlink; cause the at least one calibration signal to be switched from the at least one communication downlink to the at least one communication uplink; and calibrate at least one uplink gain in the at least one communication uplink based on a loss incurred in the at least one calibration signal in the at least one communication uplink. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A wireless communication system, comprising:
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a downlink base transceiver station (BTS) interface configured to receive downlink electrical radio frequency (RF) signals from at least one BTS; at least twelve (12) optical interface modules (OIM) each configured to; receive and convert the downlink electrical RF signals from the downlink BTS interface into downlink Radio-over-Fiber (RoF) signals on at least one of at least thirty-six (36) communication downlinks; and receive and convert uplink RoF signals from at least three (3) remote antenna units (RAUs) into uplink electrical RF signals on at least one of at least thirty-six (36) communication uplinks; an uplink BTS interface configured to receive and communicate the uplink electrical RF signals from the at least thirty-six (36) communication uplinks to the at least one BTS; and a controller configured to calibrate at least one downlink gain for each of the thirty-six (36) communication downlinks. - View Dependent Claims (19, 20)
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21. A wireless communication system, comprising:
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a downlink base transceiver station (BTS) interface configured to receive downlink radio frequency (RF) signals from at least one BTS; at least one optical interface module (OIM) configured to; receive the downlink RF signals from the downlink BTS interface for transmission as Radio-over-Fiber (RoF) signals on at least one communication downlink; and receive uplink RoF signals from at least one remote antenna unit (RAU) for transmission as uplink RF signals on at least one communication uplink; an uplink BTS interface configured to receive and communicate the uplink RF signals from the at least one communication uplink to the at least one BTS; and a controller configured to; inject at least one calibration signal over the at least one communication downlink; calibrate at least one downlink gain in the at least one communication downlink based on a loss incurred in the at least one calibration signal in the at least one communication downlink; cause the at least one calibration signal to be switched from the at least one communication downlink to the at least one communication uplink; and calibrate at least one uplink gain in the at least one communication uplink based on a loss incurred in the at least one calibration signal in the at least one communication uplink. - View Dependent Claims (22, 23)
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Specification