Headend device of distributed antenna system and signal processing method thereof

Abstract

A headend device includes a spectrum analysis unit configured to analyze a frequency spectrum of a plurality of base station signals to detect characteristic information of the plurality of the base station signals, a control unit configured to generate a control signal to control a power of the plurality of the base station signals on the basis of the characteristic information detected, and a plurality of RF units configured to receive at least one of the plurality of the base station signals and adjust the power of the base station signals received according to the control signal and output the power-adjusted base station signals.

What is claimed is: 
     
         1 . A transmission resource management sub-system of a distributed antenna system, the sub-system comprising at least one processor to implement:
 an analysis unit configured to analyze a plurality of base station signals inputted to the distributed antenna system to detect bandwidths of the plurality of base station signals; and   a control unit configured to calculate a proportional relation between the bandwidths of the plurality of base station signals, and generate a control signal for controlling power levels of the plurality of base station signals based on the proportional relation.   
     
     
         2 . The transmission resource management sub-system of  claim 1 , wherein the control signal is a signal for controlling the power levels of the plurality of base station signals so that the power levels of the plurality of base station signals correspond to a power level of a base station signal having a minimum bandwidth among the plurality of base station signals in accordance with the proportional relation. 
     
     
         3 . The transmission resource management sub-system of  claim 1 , wherein the bandwidths of the plurality of base station signals are channel bandwidths of the plurality of base station signals. 
     
     
         4 . The transmission resource management sub-system of  claim 1 , wherein at least two of the plurality of base station signals are signals complying with different communication standards. 
     
     
         5 . The transmission resource management sub-system of  claim 1 , wherein the analysis unit and the control unit are integrated into a headend device of the distributed antenna system. 
     
     
         6 . The transmission resource management sub-system of  claim 5 , wherein the headend device is configured to generate power-adjusted base station signals by adjusting the power levels of the plurality of base station signals based on the control signal, generate a combined signal by combining the power-adjusted base station signals, and output the combined signal. 
     
     
         7 . The transmission resource management sub-system of  claim 5 , wherein the analysis unit receives the plurality of base station signals from the headend device of the distributed antenna system. 
     
     
         8 . The transmission resource management sub-system of  claim 1 , wherein the analysis unit receives the plurality of base station signals from a plurality of base stations. 
     
     
         9 . A transmission resource management sub-system of a distributed antenna system, the sub-system comprising at least one processor to implement:
 an analysis unit configured to analyze a plurality of base station signals inputted to the distributed antenna system to detect input power values and a number of channels of the plurality of base station signals; and   a control unit configured to calculate a normalized factor using a sum of the input power values of the plurality of base station signals and a sum of the number of channels of the plurality of base station signals, calculate power adjustment values for each of the plurality of base station signals using the normalized factor, and generate a control signal for controlling power levels of the plurality of base station signals to correspond to the power adjustment values.   
     
     
         10 . The transmission resource management sub-system of  claim 9 , wherein control unit calculates the normalized factor by dividing the sum of the input power values of the plurality of base station signals by the sum of the number of channels of the plurality of base station signals. 
     
     
         11 . The transmission resource management sub-system of  claim 9 , wherein the control unit calculates the power adjustment values for each of the plurality of base station signals by multiplying the input power of the plurality of base station signals by the normalized factor. 
     
     
         12 . The transmission resource management sub-system of  claim 9 , wherein at least two of the plurality of base station signals are signals complying with different communication standards. 
     
     
         13 . The transmission resource management sub-system of  claim 9 , wherein the analysis unit and the control unit are integrated into a headend device of the distributed antenna system. 
     
     
         14 . The transmission resource management sub-system of  claim 13 , wherein the headend device is configured to generate power-adjusted base station signals by adjusting the power levels of the plurality of base station signals based on the control signal, generate a combined signal by combining the power-adjusted base station signals, and output the combined signal. 
     
     
         15 . The transmission resource management sub-system of  claim 13 , wherein the analysis unit receives the plurality of base station signals from the headend device of the distributed antenna system. 
     
     
         16 . The transmission resource management sub-system of  claim 9 , wherein the analysis unit receives the plurality of base station signals from a plurality of base stations.