Apparatus and method for removing signal interference in a local radio communication device mounted in a mobile terminal

Abstract

Disclosed is a method for removing signal interference in a local radio communication device mounted in a mobile terminal. The method comprises receiving information on a channel in use from the mobile terminal in session; determining based on the received channel information whether a harmonic component of a channel frequency used by the mobile terminal belongs to a frequency band used by the local radio communication device; and assigning a channel in a frequency band with none of the harmonic component among the frequency band used by the local radio communication device as a channel of the local radio communication device, when the harmonic component of the channel frequency used by the mobile terminal belongs to the frequency band used by the local radio communication device.

1 . An apparatus for removing signal interference in a Bluetooth radio device mounted in a mobile terminal, comprising: 
 a duplexer connected to an antenna of the mobile terminal;    a power amplifier in a transmitter of the mobile terminal; and    a filter interposed between the duplexer and the power amplifier, for reducing a third harmonic component of mobile terminal's transmission frequency, which causes signal interference during communication between Bluetooth radio devices.    
   
   
       2 . The apparatus as claimed in  claim 1 , wherein the filter comprises a low-pass filter for passing a frequency lower than the third harmonic band of the mobile terminal's transmission frequency, which causes signal interference during the Bluetooth communication.  
   
   
       3 . The apparatus as claimed in  claim 1 , wherein the filter comprises a band rejection filter for reducing the third harmonic component of the mobile terminal's transmission frequency, which causes signal interference during the Bluetooth communication.  
   
   
       4 . An apparatus for removing signal interference in a Bluetooth radio device mounted in a mobile terminal, comprising: 
 an antenna; and    a duplexer connected to the antenna, for separating a transmission signal from a reception signal, the duplexer having an attenuation characteristic of reducing a third harmonic component of a mobile terminal's transmission frequency, which causes signal interference during Bluetooth communication.