System, a device and a method for adjusting signal strength in a distributed amplifier system

Abstract

The invention discloses a system comprising a first device and a plurality of second device. The system comprises a first device and a plurality of second devices. The first device comprises a receiver, a spectrum analyzer, a controller and a transmitter. The receiver receives, from at least one antenna, a plurality of signals with different signal strengths from different sources. The spectrum analyzer is communicatively coupled to the receiver and obtains strengths of the plurality of received signals. The controller is communicatively coupled to the spectrum analyzer and adjusts a radiation feature of one of at least one antenna to minimize a difference of the strengths between a plurality of received signals after adjustment. The transmitter transmits the received signals after adjustment to a plurality of second devices distributed within a site. The plurality of second devices transmit the plurality of received signals after adjustment within the site.

I/We claim: 
     
         1 . A device comprising:
 a receiver configured to receive, from at least one antenna, a plurality of signals with different signal strengths from different sources;   a spectrum analyzer communicatively coupled to the first receiver and configured to determine whether the strengths of the plurality of received signals are within a predetermined range;   a controller communicatively coupled to the first spectrum analyzer and configured to adjust a radiation feature of some or all of at least one antenna by aiming at least one antenna away from the close tower or direct the at least one antenna at the far away tower such that the strengths of the plurality of received signals are within the predetermined range.   
     
     
         2 . The device of  claim 1  further comprising:
 a transmitter configured to transmit the received signals after adjustment to a plurality of second devices distributed within a site. 
 
     
     
         3 . The device of  claim 1 , wherein
 the controller is also configured to adjust the radiation feature of one of the antenna such that the difference of strengths of the plurality of received signals after adjustment are within a predetermined scope.   
     
     
         4 . The device of  claim 1 , wherein the plurality of signals are across a plurality of frequency bands, and
 the spectrum analyzer is also configured to obtain both a maximum strength and a minimum strength of each frequency band; and   the controller is also configured to adjust the radiation feature of some or all of the at least one antenna such that the strengths of the plurality of received signals after adjustment in each of the plurality of frequency bands are within the predetermined range.   
     
     
         5 . The device of  claim 1  further comprising:
 an alarm unit communicatively coupled to the spectrum analyzer and configured to generate an alarm signal if the spectrum analyzer detects that a change of the strengths of the plurality of received signals exceed a predetermined threshold. 
 
     
     
         6 . The device of  claim 1 , wherein the radiation feature of at least one antenna comprises directions of at least one antenna. 
     
     
         7 . The device of  claim 1 , wherein the radiation feature of at least one antenna comprises locations of at least one antenna. 
     
     
         8 . The device of  claim 1 , further comprising a filter configured to adjust gain of at least one of the strengths of the plurality of received signals such that the strengths of the plurality of received signals after adjustment are within the predetermined range. 
     
     
         9 . The device of  claim 1 , wherein the controller remotely adjusts a radiation feature of some or all of at least one antenna such that the strengths of a plurality of received signals after adjustment are within the predetermined range. 
     
     
         10 . The device of  claim 1 , wherein the plurality of signals are from different network operators. 
     
     
         11 . A device comprising:
 a receiver configured to receive, from at least one antenna communicatively coupled to the device, a plurality of signals with different signal strengths from different sources;   a spectrum analyzer communicatively coupled to the receiver and configured to obtain strengths of the plurality of received signals are within a predetermined range by looking at all of the signals across the band to help determine what antenna position will result in the flattest signal on all frequencies;   a controller communicatively coupled to the spectrum analyzer and configured to determine an adjustment indication according to the strength   wherein the device further comprises a filter configured to adjust some or all of the gain of at least one of the strengths of the plurality of received signals according the adjustment indication such that the strengths of the plurality of received signals after adjustment are within the predetermined range.   
     
     
         12 . The device of  claim 11  further comprising a transmitter configured to transmit the received signals after adjustment to a plurality of second devices distributed within a site. 
     
     
         13 . The device of  claim 11 , wherein the filter includes a radio frequency (RF) filter configured to adjust gain of some or all of at least one of the strengths of the plurality of received signals. 
     
     
         14 . The device of  claim 11 , wherein the filter includes a synthesizer configured to select a part of the plurality of received signals within a predetermined frequency range. 
     
     
         15 . The device of  claim 11 , wherein the filter further comprises a digital signal processing (DSP) unit configured to filter the plurality of signals. 
     
     
         16 . The device of  claim 11  further comprising:
 an alarm unit configured to generate an alarm signal if the spectrum analyzer detects that a change of the strengths of the plurality of received signals exceed a predetermined threshold. 
 
     
     
         17 . The device of  claim 11 , wherein the radiation feature of at least one antenna comprises directions of at least one antenna. 
     
     
         18 . The device of  claim 11 , wherein the radiation feature of at least one antenna comprises locations of at least one antenna. 
     
     
         19 . A method comprising:
 receiving, from at least one antenna, a plurality of signals with different signal strengths from different sources;   determining whether the strengths of the plurality of received signals are within a predetermined range; and   adjusting gain, with a filter, of some or all of at least one of the strengths of the plurality of received signals such that the strengths of the plurality of received signals after adjustment are within the predetermined range.   
     
     
         20 . The method of  claim 19 , wherein adjusting the gain of at least one of the strengths of the plurality of received signals includes selecting a part of the plurality of received signals within a predetermined frequency range.