Node unit of distributed antenna system
First Claim
Patent Images
1. A node unit of a distributed antenna system, comprising:
- a signal input/output unit configured to receive m uplink signals from m lower node units and output the m uplink signals, where m is a positive integer greater than 1;
a multiplexer configured to generate a single uplink signal by selectively outputting any one of the m uplink signals at an interval of a predetermined output time;
a filter configured to output an image eliminated signal by eliminating an image signal from the single uplink signal; and
a down-sampler configured to output a transmission target uplink signal by converting a sampling rate of the image eliminated signal to correspond to a sampling rate of any one of the m uplink signals.
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Abstract
The inventive concept relates to a distributed antenna system (DAS), and more particularly, to an uplink signal transmission operation of each of node units constituting a DAS. A node unit of a DAS includes a signal input/output unit configured to receive m uplink signals from m lower node units and output the m uplink signals, and a multiplexer configured to generate a single uplink signal by selectively outputting any one of the m uplink signals at an interval of a predetermined output time. Accordingly, it is possible to provide a DAS capable of processing and outputting, as one signal, uplink signals received from a plurality of remote units, without any error.
10 Citations
11 Claims
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1. A node unit of a distributed antenna system, comprising:
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a signal input/output unit configured to receive m uplink signals from m lower node units and output the m uplink signals, where m is a positive integer greater than 1; a multiplexer configured to generate a single uplink signal by selectively outputting any one of the m uplink signals at an interval of a predetermined output time; a filter configured to output an image eliminated signal by eliminating an image signal from the single uplink signal; and a down-sampler configured to output a transmission target uplink signal by converting a sampling rate of the image eliminated signal to correspond to a sampling rate of any one of the m uplink signals. - View Dependent Claims (2, 3)
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4. A remote unit of a distributed antenna system, comprising:
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a converter configured to convert a terminal signal received from a mobile communication terminal into a first uplink signal and output the first uplink signal; and a multiplexer configured to generate a single uplink signal by selectively outputting any one of the first uplink signal and a second uplink signal at an interval of a predetermined output time, wherein the second uplink signal is received from a lower node unit; a filter configured to output an image eliminated signal by eliminating an image signal from the single uplink signal; and a down-sampler configured to output a transmission target uplink signal by converting a sampling rate of the image eliminated signal to correspond to a sampling rate of any one of the first uplink signal and the second uplink signal. - View Dependent Claims (5, 6)
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7. A node unit of a distributed antenna system, comprising:
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a first signal processing unit configured to receive first uplink signals and generate a first transmission target uplink signal by selectively outputting any one of the first uplink signals at an interval of a predetermined output time; a second signal processing unit configured to receive second uplink signals and generate a second transmission target uplink signal by selectively outputting any one of the second uplink signals at the interval of the output time; and a third signal processing unit configured to receive the first transmission target uplink signal and the second transmission target uplink signal and generate a third transmission target uplink signal by selectively outputting any one of the first transmission target uplink signal and the second transmission target uplink signal at the interval of the output time, wherein at least one of the first signal processing unit, the second signal processing unit, and the third signal processing unit includes; a multiplexer configured to generate a corresponding single uplink signal by selectively outputting any one of corresponding received uplink signals at the interval of the output time; a filter configured to output an image eliminated signal by eliminating an image signal from the corresponding single uplink signal; and a down-sampler configured to output a corresponding transmission target uplink signal by converting a sampling rate of the image eliminated signal to correspond to a sampling rate of any one of the corresponding received uplink signals. - View Dependent Claims (8, 9, 10, 11)
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Specification