Distributed antenna system

A master unit in a distributed antenna system, the master unit comprising:

• a wavelet signal processor transforming, to a wavelet domain, a radio frequency signal coming from a mobile communications network;
• a signal splitter splitting the digital radio frequency signal, transformed to a wavelet domain, into a plurality of digital radio frequency signals;
• and
• a signal merger merging digital radio frequency signals in a wavelet domain, which are received from a plurality of remote units;
• an inverse-wavelet signal processor performing an inverse-wavelet transform on the merged digital radio frequency signal, which is then transformed to a radio frequency signal and output to a mobile communications network;
• and
• a merge controller determining whether the digital radio frequency signal, transmitted by each of the remote units, is normal or abnormal based on the digital radio frequency signal transformed to a wavelet domain, and control the merge in the signal merger.

A remote unit in a distributed antenna system, the remote unit comprising:

• an upper transceiver transmitting or receiving digital radio frequency signals in a wavelet domain to or from an upper node;
• an inverse-wavelet signal processor performing an inverse-wavelet transform on the digital radio frequency signals, output from the upper transceiver, which is then transformed to a split radio frequency signal and output to an antenna;
• a wavelet signal processor transforming the radio frequency signal, received from the antenna, to a wavelet domain, which is then output to the upper transceiver
• a lower transceiver transmitting or receiving the digital radio frequency signal to or from a lower node;
• a signal splitter splitting the digital radio frequency signal, received from the upper transceiver, to an inverse-wavelet signal processor and a lower transceiver;
• a signal merger merging the digital radio frequency signals, which are output from the wavelet signal processor and output from the lower transceiver, and output the merged digital radio frequency signal to the upper transceiver;
• and
• a state determiner determining whether the digital radio frequency signal, transmitted by each of the remote units, is normal based on the digital radio frequency signal transformed to the wavelet domain.