REDUCING LEAKED DOWNLINK INTERFERENCE SIGNALS IN A REMOTE UNIT UPLINK PATH(S) IN A DISTRIBUTED ANTENNA SYSTEM (DAS)
First Claim
1. A wireless communication system, comprising:
- a plurality of remote units located on multiple floors of an infrastructure, each remote unit configured to receive optical communications signals and having at least one antenna;
a head-end equipment (HEE) communicatively coupled to the plurality of remote units over at least one downlink optical communications medium and at least one uplink optical communications medium;
wherein at least one remote unit among the plurality of remote units comprises a coupling device coupled to a downlink path configured to carry a downlink signal and an uplink path configured to carry an uplink signal, the coupling device configured to;
receive the downlink signal from the downlink path and provide the downlink signal to an antenna, wherein the downlink signal comprises at least one downlink communications signal and at least one downlink interference signal; and
provide the uplink signal to the uplink path, wherein the uplink signal comprises an uplink communications signal received from the antenna and the at least one downlink interference signal leaked from the downlink path to the uplink path; and
an interference control system communicatively coupled to the at least one remote unit among the plurality of remote units, the interference control system configured to;
provide the at least one downlink communications signal to the at least one remote unit over the at least one downlink optical communications medium;
receive the uplink signal from the at least one remote unit over the at least one uplink optical communications medium;
measure signal strength of the at least one downlink interference signal comprised in the uplink signal; and
generate and provide an adjustment control signal to an adjustment circuit in the at least one remote unit to reduce the at least one downlink interference signal in the uplink signal.
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Accused Products
Abstract
Methods and systems for reducing leaked downlink interference signals in a remote unit uplink path(s) in a distributed antenna system (DAS) are provided. In a remote antenna unit (RAU) disclosed herein, a downlink interference signal may be leaked from a downlink path to an uplink path in the RAU. In this regard, an adjustment circuit is provided in the downlink path of the RAU to suppress the downlink interference signal. A control system is provided in the DAS to monitor the leaked downlink interference signal and control the adjustment circuit in the RAU to minimize the leaked downlink interference signal in the uplink path. By providing the adjustment circuit in the RAU and the control system in the DAS to minimize the leaked downlink interference signal in the uplink path, it is possible to reduce interferences between downlink and uplink communications signals without increasing costs of the RAU.
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Citations
18 Claims
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1. A wireless communication system, comprising:
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a plurality of remote units located on multiple floors of an infrastructure, each remote unit configured to receive optical communications signals and having at least one antenna; a head-end equipment (HEE) communicatively coupled to the plurality of remote units over at least one downlink optical communications medium and at least one uplink optical communications medium; wherein at least one remote unit among the plurality of remote units comprises a coupling device coupled to a downlink path configured to carry a downlink signal and an uplink path configured to carry an uplink signal, the coupling device configured to; receive the downlink signal from the downlink path and provide the downlink signal to an antenna, wherein the downlink signal comprises at least one downlink communications signal and at least one downlink interference signal; and provide the uplink signal to the uplink path, wherein the uplink signal comprises an uplink communications signal received from the antenna and the at least one downlink interference signal leaked from the downlink path to the uplink path; and an interference control system communicatively coupled to the at least one remote unit among the plurality of remote units, the interference control system configured to; provide the at least one downlink communications signal to the at least one remote unit over the at least one downlink optical communications medium; receive the uplink signal from the at least one remote unit over the at least one uplink optical communications medium; measure signal strength of the at least one downlink interference signal comprised in the uplink signal; and generate and provide an adjustment control signal to an adjustment circuit in the at least one remote unit to reduce the at least one downlink interference signal in the uplink signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A wireless communication system, comprising:
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a plurality of remote units distributed throughout an infrastructure, each remote unit configured to receive optical communications signals and having at least one antenna; and a head-end equipment (HEE) communicatively coupled to the remote units and comprising; a signal generator coupled to at least one of the remote units over at least one downlink optical communications medium, the signal generator configured to generate and distribute at least one downlink communications signal to a downlink path in the at least one remoute unit over the at least one downlink optical communications medium; and a spectrum analyzer coupled to the at least one remote unit over at least one uplink optical communications medium, the spectrum analyzer configured to; receive an uplink signal from an uplink path in the at least one remote unit over the at least one uplink optical communications medium, wherein the uplink signal comprises at least one downlink interference signal leaked from the downlink path to the uplink path in the at least one remote unit; measure signal strength of the at least one downlink interference signal comprised in the uplink signal; and provide the measured signal strength of the at least one downlink interference signal to a process controller that is communicatively coupled to the spectrum analyzer and the signal generator; and wherein the process controller is configured to provide an adjustment control signal to the at least one remote to minimize the at least one downlink interference signal in the uplink signal based at least in part on the measured signal strength of the at least one downlink interference signal. - View Dependent Claims (15, 16, 17, 18)
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Specification