TdDD switching control apparatus of the distributed antenna system
First Claim
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1. A distributed antenna system in which a head-end unit shares a TDD (Time Division Duplex) switching signal with a plurality of remote units, the distributed antenna system comprising:
- the head-end unit comprising;
an FEM (Front-End Module) configured to receive an input signal from a base station and perform noise-filtering of the input signal, to adjust a power level of the input signal, and to generate a power level-adjusted signal from the input signal;
a Tsync detector configured to detect a synchronization signal from the power level-adjusted signal;
a switching signal generator configured to generate a DL/UL (Down Link/Up Link) switching signal by using the power level-adjusted signal and the synchronization signal;
an OOK (On-Off Keying) modulator configured to modulate a carrier signal based on the DL/UL switching signal and to thereby generate an OOK-modulated analog signal;
a combiner configured to generate a combined signal by combining the power level-adjusted signal with the OOK-modulated analog signal; and
a photoelectric conversion unit configured to convert the combined signal into an optical signal, anda plurality of remote units, connected to the head-end unit via optical fibers, each comprising;
a photoelectric conversion unit configured to convert the optical signal into an electric signal to thereby generate the combined signal;
an OOK (On-Off Keying) demodulator configured to demodulate the combined signal to thereby generate the DL/UL switching signal;
a switching signal delay control unit configured to apply a delay to the DL/UL switching signal for compensating a hardware delay and to thereby output compensated DL/UL switching signal; and
a radio frequency (RF) unit configured to transmit a DL signal or a UL signal by using the compensated DL/UL switching signal.
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Abstract
A TDD (Time Division Duplex) switching control apparatus in a DAS (Distributed Antenna System) is provided. The present disclosure in some embodiments provides an apparatus, in a TDD switching control of a distributed antenna system, for transmitting a switching signal by using correlation property between a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal) and a property of a matched filter.
6 Citations
12 Claims
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1. A distributed antenna system in which a head-end unit shares a TDD (Time Division Duplex) switching signal with a plurality of remote units, the distributed antenna system comprising:
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the head-end unit comprising; an FEM (Front-End Module) configured to receive an input signal from a base station and perform noise-filtering of the input signal, to adjust a power level of the input signal, and to generate a power level-adjusted signal from the input signal; a Tsync detector configured to detect a synchronization signal from the power level-adjusted signal; a switching signal generator configured to generate a DL/UL (Down Link/Up Link) switching signal by using the power level-adjusted signal and the synchronization signal; an OOK (On-Off Keying) modulator configured to modulate a carrier signal based on the DL/UL switching signal and to thereby generate an OOK-modulated analog signal; a combiner configured to generate a combined signal by combining the power level-adjusted signal with the OOK-modulated analog signal; and a photoelectric conversion unit configured to convert the combined signal into an optical signal, and a plurality of remote units, connected to the head-end unit via optical fibers, each comprising; a photoelectric conversion unit configured to convert the optical signal into an electric signal to thereby generate the combined signal; an OOK (On-Off Keying) demodulator configured to demodulate the combined signal to thereby generate the DL/UL switching signal; a switching signal delay control unit configured to apply a delay to the DL/UL switching signal for compensating a hardware delay and to thereby output compensated DL/UL switching signal; and a radio frequency (RF) unit configured to transmit a DL signal or a UL signal by using the compensated DL/UL switching signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, in a distributed antenna system, for sharing a TDD (Time Division Duplex) switching signal between a head-end unit and a plurality of remote units, the method comprising:
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by the head-end unit, receiving the input signal from the base station and performing noise-filtering of the input signal, adjusting a power level of the input signal, and generating a power level-adjusted signal from the input signal; by the head-end unit, detecting a synchronization signal from the power level-adjusted signal; by the head-end unit, generating a DL/UL (Down Link/Up Link) switching signal by using the power level-adjusted signal and the synchronization signal; by the head-end unit, generating an OOK-modulated analog signal by modulating a carrier signal based on the DL/UL switching signal; by the head-end unit, generating a combined signal by combining the power level-adjusted signal with the OOK-modulated analog signal; by the head-end unit, converting the combined signal into an optical signal, by each of the plurality of remote units, converting the optical signal into an electric signal to generate the combined signal; by each of the plurality of remote units, demodulating the combined signal to generate the DL/UL switching signal; by each of the plurality of remote units, applying a delay to the DL/UL switching signal for compensating a hardware delay and thereby outputting a compensated DL/UL switching signal; and by each of the plurality of remote units, transmitting a DL signal or a UL signal by using the compensated DL/UL switching signal. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification