Distributed antenna system
First Claim
1. A distributed antenna system, comprising:
- a master unit interfaced with a wireless communications network that performs a bidirectional simultaneous frequency distribution of a wireless signal; and
remote units coupled to the master unit that each perform a wireless transmission or reception of a split radio frequency signal to or from terminals located within a coverage area,wherein the master unit and the remote units transmit or receive digital radio frequency signals in a wavelet transform domain,wherein the master unit determines whether the digital radio frequency signals, transmitted by the remote units, are normal through distribution pattern or characteristics of wavelet coefficients of the digital radio frequency signals based on the digital radio frequency signals which are transformed to a wavelet domain, and merges the digital radio frequency signals, andwherein the master unit calculates and merges a weighted sum of each radio frequency signal, of which a weight changes, according to whether the digital radio frequency signals are normal.
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Accused Products
Abstract
A technology related to a distributed antenna system is disclosed. In an exemplary embodiment, a distributed antenna system may include a master unit and a plurality of remote units. The master unit may be interfaced with a wireless communications network and perform a bidirectional simultaneous digital radio frequency distribution of a wireless signal. The plurality of remote units may be each coupled to the master unit, and each perform a wireless transmission or reception of a split radio frequency signal to or from terminals located within a coverage. The master unit and the plurality of remote units may transmit or receive digital radio frequency signals in a wavelet transform domain. The master unit may determine whether the digital radio frequency signal, transmitted by each of the remote units, is normal, and merge the digital radio frequency signals.
33 Citations
11 Claims
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1. A distributed antenna system, comprising:
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a master unit interfaced with a wireless communications network that performs a bidirectional simultaneous frequency distribution of a wireless signal; and remote units coupled to the master unit that each perform a wireless transmission or reception of a split radio frequency signal to or from terminals located within a coverage area, wherein the master unit and the remote units transmit or receive digital radio frequency signals in a wavelet transform domain, wherein the master unit determines whether the digital radio frequency signals, transmitted by the remote units, are normal through distribution pattern or characteristics of wavelet coefficients of the digital radio frequency signals based on the digital radio frequency signals which are transformed to a wavelet domain, and merges the digital radio frequency signals, and wherein the master unit calculates and merges a weighted sum of each radio frequency signal, of which a weight changes, according to whether the digital radio frequency signals are normal. - View Dependent Claims (2, 3, 4)
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5. A master unit in a distributed antenna system, the master unit comprising:
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a wavelet signal processor configured to transform, to a digital radio frequency signal in a wavelet domain, a radio frequency signal coming from a mobile communications network; a signal splitter configured to split the transformed digital radio frequency signal into a plurality of digital radio frequency signals; a signal merger configured to merge, in the wavelet domain, the plurality of digital radio frequency signals, which are received from remote units, into a merged digital radio frequency signal; an inverse-wavelet signal processor configured to perform an inverse-wavelet transform on the merged digital radio frequency signal, which is transformed into a radio frequency signal and output to a mobile communications network; and a merge controller configured to determine whether signals among the plurality of digital radio frequency signals, transmitted by the remote units, are normal through distribution pattern or characteristics of wavelet coefficients of the radio frequency signals based on the plurality of digital radio frequency signals which are transformed to the wavelet domain, control the merge performed by the signal merger, and merge a weighted sum of each of the plurality of digital radio frequency signals of which a weight changes according to whether a corresponding radio frequency signal is normal. - View Dependent Claims (6, 7)
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8. A remote unit in a distributed antenna system, the remote unit comprising:
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an upper transceiver configured to transmit or receive digital radio frequency signals in a wavelet domain to or from an upper node; an inverse-wavelet signal processor configured to perform an inverse-wavelet transform on the digital radio frequency signals, which are output from the upper transceiver, and which are transformed into a split radio frequency signal and output to an antenna; a wavelet signal processor configured to transform the radio frequency signal, which is received from the antenna, to a wavelet domain, which is output to the upper transceiver; a state determiner configured to determine whether the digital radio frequency signals, which are transmitted by remote units, are normal through distribution pattern or characteristics of wavelet coefficients of the digital radio frequency signals based on the digital radio frequency signals which are transformed to the wavelet domain; a lower transceiver configured to transmit or receive a digital radio frequency signal, among the digital radio frequency signals, to or from a lower node; a signal splitter configured to split the digital radio frequency signal, which is received from the upper transceiver, to an inverse-wavelet signal processor and a lower transceiver; and a signal merger configured to merge the digital radio frequency signals, which are output from the wavelet signal processor and output from the lower transceiver, into a merged digital radio frequency signal, and output the merged digital radio frequency signal to the upper transceiver. - View Dependent Claims (9, 10, 11)
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Specification