Offsetting unwanted downlink interference signals in an uplink path in a distributed antenna system (DAS)
First Claim
1. An interference signal offset circuit comprising:
- at least one offset signal generation circuit configured to;
receive a downlink signal in a downlink path, the downlink signal comprising at least one unwanted downlink interference signal; and
generate at least one uplink interference offset signal based on the received at least one unwanted downlink interference signal;
a signal summing circuit configured to;
receive an uplink signal in an uplink path, the uplink signal comprising a wanted uplink signal and the at least one unwanted downlink interference signal leaked from the downlink path to the uplink path;
receive the at least one uplink interference offset signal;
generate an output uplink signal based on the received uplink signal; and
combine the received at least one uplink interference offset signal with the received uplink signal to offset the at least one unwanted downlink interference signal from the output uplink signal; and
a control circuit configured to;
measure a power level of the at least one unwanted downlink interference signal;
receive the output uplink signal from the signal summing circuit; and
configure the at least one offset signal generation circuit to generate the at least one uplink interference offset signal based on the measured power level of the at least one unwanted downlink interference signal to offset the at least one unwanted downlink interference signal.
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Accused Products
Abstract
Offsetting unwanted downlink interference signals in an uplink path in a distributed antenna system (DAS) is disclosed. In this regard, in one example, an interference signal offset circuit is provided in an RAU to offset interference products leaked from a downlink path to an uplink path. An offset signal generation circuit is configured to generate at least one uplink interference offset signal based on the interference products leaked from the downlink path. A signal summing circuit is configured to combine the at least one uplink interference offset signal with an uplink signal received on the uplink path, thus offsetting the interference products in the uplink signal. By providing the interference signal offset circuit in the RAU to offset the interference products on the uplink path, it is possible to provide more implementation flexibility for the RAU without degrading the uplink signal.
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Citations
21 Claims
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1. An interference signal offset circuit comprising:
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at least one offset signal generation circuit configured to; receive a downlink signal in a downlink path, the downlink signal comprising at least one unwanted downlink interference signal; and generate at least one uplink interference offset signal based on the received at least one unwanted downlink interference signal; a signal summing circuit configured to; receive an uplink signal in an uplink path, the uplink signal comprising a wanted uplink signal and the at least one unwanted downlink interference signal leaked from the downlink path to the uplink path; receive the at least one uplink interference offset signal; generate an output uplink signal based on the received uplink signal; and combine the received at least one uplink interference offset signal with the received uplink signal to offset the at least one unwanted downlink interference signal from the output uplink signal; and a control circuit configured to; measure a power level of the at least one unwanted downlink interference signal; receive the output uplink signal from the signal summing circuit; and configure the at least one offset signal generation circuit to generate the at least one uplink interference offset signal based on the measured power level of the at least one unwanted downlink interference signal to offset the at least one unwanted downlink interference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of offsetting at least one unwanted downlink interference signal from an uplink signal comprising:
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receiving a downlink signal in a downlink path, wherein the downlink signal comprises at least one unwanted downlink interference signal; measuring a power level of the at least one unwanted downlink interference signal; generating at least one uplink interference offset signal based on the measured power level of the at least one unwanted downlink interference signal; receiving an uplink signal in an uplink path, wherein the uplink signal comprises a wanted uplink signal and the at least one unwanted downlink interference signal leaked from the downlink path to the uplink path; generating an output uplink signal based on the received uplink signal; and combining the at least one uplink interference offset signal with the received uplink signal to offset the at least one unwanted downlink interference signal in a clean output uplink signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A remote unit (RU), comprising:
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a downlink power amplifier configured to amplify a plurality of downlink communications signals received in a downlink path to generate a downlink signal in the downlink path, the downlink signal comprising at least one unwanted downlink interference signal; at least one antenna configured to transmit the downlink signal and receive an uplink signal; a coupling device communicatively coupled to the downlink power amplifier and the at least one antenna, wherein the coupling device is configured to; distribute the downlink signal received from the downlink path to the at least one antenna for transmission; and distribute the uplink signal received from the at least one antenna to an uplink path, the uplink signal comprising a wanted uplink signal and the at least one unwanted downlink interference signal leaked from the downlink path to the uplink path; and an interference signal offset circuit, comprising; at least one offset signal generation circuit configured to; receive the downlink signal comprising the at least one unwanted downlink interference signal; and generate at least one uplink interference offset signal based on the received at least one unwanted downlink interference signal; a signal summing circuit configured to; receive the uplink signal in the uplink path; receive the at least one uplink interference offset signal; generate an output uplink signal based on the received uplink signal; and combine the received at least one uplink interference offset signal with the received uplink signal to offset the at least one unwanted downlink interference signal from the output uplink signal; and a control circuit configured to; measure a power level of the at least one unwanted downlink interference signal; receive the output uplink signal from the signal summing circuit; and configure the at least one offset signal generation circuit to generate the at least one uplink interference offset signal based on the measured power level of the at least one unwanted downlink interference signal to offset the at least one unwanted downlink interference signal. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification