최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0824660 (2015-08-12) |
등록번호 | US-9253003 (2016-02-02) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 8 인용 특허 : 671 |
Frequency shifting a communications signal(s) in a multiple frequency (multi-frequency) distributed antenna system (DAS) to avoid or reduce frequency interference is disclosed. Related devices, methods, and DASs are disclosed. Non-limiting examples of frequency interference include frequency band in
Frequency shifting a communications signal(s) in a multiple frequency (multi-frequency) distributed antenna system (DAS) to avoid or reduce frequency interference is disclosed. Related devices, methods, and DASs are disclosed. Non-limiting examples of frequency interference include frequency band interference and frequency channel interference. As a non-limiting example, frequency interference in a multi-frequency DAS may result from non-linearity of a signal processing component generating an out-of-band harmonic of a first, in-use communications signal in a first frequency band, within different frequency band(s) of other in-use communications signal(s). To avoid or reduce such interference, embodiments disclosed herein involve predicting frequency interference that may result from processing received, in-use communications signals in multiple frequency bands to be distributed in a multi-frequency DAS. Frequency shifting is performed to avoid or reduce any interfering signal products produced from the signal processing of any in-use communications signals, from interfering in the frequencies of other in-use communications signals.
1. A multiple frequency (multi-frequency) distributed antenna system (DAS), comprising: a central unit configured to: receive a combined uplink multi-frequency communications signal from a plurality of remote units;receive a first downlink communications signal in at least one first frequency range
1. A multiple frequency (multi-frequency) distributed antenna system (DAS), comprising: a central unit configured to: receive a combined uplink multi-frequency communications signal from a plurality of remote units;receive a first downlink communications signal in at least one first frequency range and a second downlink communications signal in at least one second frequency range different from the at least one first frequency range; anddistribute the first downlink communications signal as an output first downlink communications signal to a first downlink communications signal path output and the second downlink communications signal as an output second downlink communications signal to a second downlink communications signal path output;the central unit comprising: a combiner communicatively coupled to the first downlink communications signal path output and the second downlink communications signal path output, the combiner configured to combine the output first downlink communications signal and the output second downlink communications signal into a combined downlink multi-frequency communications signal; andthe plurality of remote units each configured to: receive the combined downlink multi-frequency communications signal from the central unit and distribute the combined downlink multi-frequency communications signal from the central unit to at least one client device;receive a first uplink communications signal in at least one first frequency range and a second uplink communications signal in at least one second frequency range different from the at least one first frequency range; anddistribute the first uplink communications signal as an output first uplink communications signal to a first uplink communications signal path output and the second uplink communications signal as an output second uplink communications signal to a second uplink communications signal path output;each of the plurality of remote units comprising: a combiner communicatively coupled to the first uplink communications signal path output and the second uplink communications signal path output, the combiner configured to combine the output first uplink communications signal and the output second uplink communications signal into a combined uplink multi-frequency communications signal;a frequency interference prediction system, comprising: a first communications signal path, comprising: a first frequency shifting circuit configured to frequency shift at least one first communications signal among the first downlink communications signal and the first uplink communications signal from a first frequency to a shifted first communications signal at a shifted first frequency based on a first frequency control signal;a second communications signal path configured to provide at least one second communications signal among the second downlink communications signal and the second uplink communications signal as an output second communications signal to a second communications signal path output among the second downlink communications signal path output and the second uplink communications signal path output; anda controller configured to: predict frequency interference in a combined multi-frequency communications signal among the combined downlink multi-frequency communications signal and the combined uplink multi-frequency communications signal;if frequency interference is predicted in the combined multi-frequency communications signal:determine the shifted first frequency to shift the at least one first communications signal in the combined multi-frequency communications signal; andset the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency. 2. The multi-frequency DAS of claim 1, wherein the frequency interference prediction system comprises: a communications signal interface, comprising: a first communications signal interface configured to receive the at least one first communications signal in the at least one first frequency range; anda second communications signal interface configured to receive the at least one second communications signal in the at least one second frequency range different from the at least one first frequency range. 3. The multi-frequency DAS of claim 1, wherein: the controller is configured to: predict the frequency interference in the combined multi-frequency communications signal based on a first interfering signal product generated from signal processing of the at least one first communications signal in the multi-frequency DAS, interfering in the at least one second frequency range of the at least one second communications signal; andif frequency interference from the first interfering signal product is predicted in the combined multi-frequency communications signal, the controller is configured to determine the shifted first frequency to shift the at least one first communications signal in the combined multi-frequency communications signal so that the first interfering signal product does not interfere with the at least one second frequency range of the at least one second communications signal. 4. The multi-frequency DAS of claim 1, wherein: the controller is configured to: predict the frequency interference in the combined multi-frequency communications signal, based on a second interfering signal product generated from signal processing of the at least one second communications signal in the multi-frequency DAS interfering in the at least one first frequency range of the at least one first communications signal; andif frequency interference from the second interfering signal product is predicted in the combined multi-frequency communications signal, the controller is configured to determine the shifted first frequency to shift the at least one first communications signal in the combined multi-frequency communications signal so that the second interfering signal product does not interfere with the at least one first frequency range of the at least one first communications signal. 5. The multi-frequency DAS of claim 3, wherein the second communications signal path comprises a second frequency shifting circuit configured to frequency shift the at least one second communications signal from a second frequency to a shifted second communications signal at a shifted second frequency based on a second frequency control signal. 6. The multi-frequency DAS of claim 3, further comprising a first selector circuit configured to selectively provide the at least one first communications signal or the shifted first communications signal as an output first communications signal to a first communications signal path output, in response to a first selector control signal; the controller further configured to, if frequency interference is predicted in the combined multi-frequency communications signal, generate the first selector control signal to cause the first selector circuit to provide the shifted first communications signal as the output first communications signal to the first communications signal path output. 7. The multi-frequency DAS of claim 6, further comprising a second selector circuit configured to selectively provide the at least one second communications signal or a shifted second communications signal as the output second communications signal to the second communications signal path output, in response to a second selector control signal. 8. The multi-frequency DAS of claim 7, wherein: if frequency interference from the first interfering signal product generated from signal processing of the at least one first communications signal in the multi-frequency DAS is predicted in the combined multi-frequency communications signal, the controller is further configured to generate the second selector control signal to cause the second selector circuit to provide the at least one second communications signal as the output second communications signal to the second communications signal path output. 9. The multi-frequency DAS of claim 5, wherein the controller is further configured to: predict frequency interference in the combined multi-frequency communications signal based on a second interfering signal product generated from signal processing of the at least one second communications signal in the multi-frequency DAS, interfering in the at least one first frequency range of the at least one first communications signal;if frequency interference from the second interfering signal product is predicted in the combined multi-frequency communications signal: determine the shifted second frequency to shift the at least one second communications signal based on the predicted frequency interference in the combined multi-frequency communications signal so that the second interfering signal product does not interfere with the at least one first frequency range of the at least one first communications signal. 10. The multi-frequency DAS of claim 3, wherein: the at least one first communications signal is in a first frequency band;the at least one second communications signal is in a second frequency band;the first frequency shifting circuit is configured to frequency shift the at least one first communications signal from the first frequency band to the shifted first communications signal at a shifted first frequency band based on the first frequency control signal; andthe controller is configured to: predict frequency band interference in the combined multi-frequency communications signal, based on the first interfering signal product generated from signal processing of the at least one first communications signal in the multi-frequency DAS interfering in the second frequency band of the at least one second communications signal;if the frequency band interference from the first interfering signal product is predicted in the combined multi-frequency communications signal, set the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency outside of the second frequency band of the at least one second communications signal. 11. The multi-frequency DAS of claim 10, wherein the controller is configured to: predict the frequency band interference in the combined multi-frequency communications signal by being configured to: calculate at least one first spurious interfering signal product generated from signal processing of the at least one first communications signal in the multi-frequency DAS; anddetermine if a frequency of the at least one first spurious interfering signal product is contained in the second frequency band of the at least one second communications signal; andif the frequency of the at least one first spurious interfering signal product is contained in the second frequency band of the at least one second communications signal, the controller is configured to set the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency outside of the second frequency band of the at least one second communications signal. 12. The multi-frequency DAS of claim 4, wherein: the at least one first communications signal is in a first frequency band;the at least one second communications signal is in a second frequency band;the first frequency shifting circuit is configured to frequency shift the at least one first communications signal from the first frequency band to the shifted first communications signal at a shifted first frequency band based on the first frequency control signal; andthe controller is configured to: predict frequency band interference in the combined multi-frequency communications signal based on the second interfering signal product generated from signal processing of the at least one second communications signal in the multi-frequency DAS, interfering in the first frequency band of the at least one first communications signal;if the frequency band interference from the second interfering signal product is predicted in the combined multi-frequency communications signal, set the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency outside of a frequency of the second interfering signal product and outside of the second frequency band of the at least one second communications signal. 13. The multi-frequency DAS of claim 12, wherein the controller is configured to: predict the frequency band interference in the combined multi-frequency communications signal by being configured to: calculate at least one second spurious interfering signal product generated from signal processing of the at least one second communications signal in the multi-frequency DAS; anddetermine if a frequency of the at least one second spurious interfering signal product is contained in the first frequency band of the at least one first communications signal; andif the frequency of the at least one second spurious interfering signal product is contained in the first frequency band of the at least one first communications signal, the controller is configured to set the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency outside of the frequency of the second interfering signal product and outside of the second frequency band of the at least one second communications signal. 14. The multi-frequency DAS of claim 3, wherein: the at least one first communications signal is in at least one first frequency channel;the at least one second communications signal is in at least one second frequency channel;the first frequency shifting circuit is configured to frequency shift the at least one first communications signal from the at least one first frequency channel to the shifted first communications signal at a shifted first frequency channel based on the first frequency control signal; andthe controller is configured to: predict frequency channel interference in the combined multi-frequency communications signal based on the first interfering signal product generated from signal processing of the at least one first communications signal in the multi-frequency DAS, interfering in the at least one second frequency channel of the at least one second communications signal;if the frequency channel interference from the first interfering signal product is predicted in the combined multi-frequency communications signal, set the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency channel outside of the at least one second frequency channel of the at least one second communications signal. 15. The multi-frequency DAS of claim 4, wherein: the at least one first communications signal is in at least one first frequency channel;the at least one second communications signal is in at least one second frequency channel;the first frequency shifting circuit is configured to frequency shift the at least one first communications signal from the at least one first frequency channel to the shifted first communications signal at a shifted first frequency channel based on the first frequency control signal; andthe controller is configured to: predict frequency channel interference in the combined multi-frequency communications signal based on the second interfering signal product generated from signal processing of the at least one second communications signal in the multi-frequency DAS, interfering in the at least one first frequency channel of the at least one first communications signal;if the frequency channel interference from the second interfering signal product is predicted in the combined multi-frequency communications signal, set the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency channel outside of a frequency of the second interfering signal product and outside of the at least one second frequency channel. 16. The multi-frequency DAS of claim 1, wherein the frequency interference prediction system is disposed in the central unit. 17. The multi-frequency DAS of claim 1, wherein the frequency interference prediction system is disposed in at least one remote unit among the plurality of remote units. 18. The multi-frequency DAS of claim 1, wherein the controller is further configured to provide a synchronization control signal based on the first frequency control signal in the combined multi-frequency communications signal. 19. The multi-frequency DAS of claim 18, wherein the central unit is further configured to combine the combined downlink multi-frequency communications signal with the synchronization control signal into a combined downlink signal. 20. The multi-frequency DAS of claim 19, wherein at least one remote unit among the plurality of remote units is further configured to separate the combined downlink signal into the combined downlink multi-frequency communications signal and the synchronization control signal. 21. The multi-frequency DAS of claim 18, wherein at least one remote unit among the plurality of remote units is further configured to combine the first uplink communications signal with the synchronization control signal into a combined uplink signal. 22. The multi-frequency DAS of claim 21, wherein the central unit is further configured to separate the combined uplink signal into the first uplink communications signal and the synchronization control signal. 23. The multi-frequency DAS of claim 1, further comprising an electrical-to-optical converter configured to convert the combined multi-frequency communications signal into an optical combined multi-frequency communications signal. 24. The multi-frequency DAS of claim 1, wherein the first frequency shifting circuit comprises: a first synthesizer configured to receive the first frequency control signal and generate a first mixing frequency signal based on the received first frequency control signal; anda first mixer configured to receive the first mixing frequency signal and the at least one first communications signal, and mix the first mixing frequency signal with the at least one first communications signal to generate the shifted first communications signal. 25. The multi-frequency DAS of claim 1 installed in an indoor building.
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