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

A method for removing signal interference in a Bluetooth radio device mounted in a CDMA (Code Division Multiple Access) mobile terminal, comprising the steps of:

• receiving information of an occupied channel from the CDMA mobile terminal in session;
• determining whether a third harmonic component of the occupied channel frequency of the CDMA mobile terminal in session overlaps with a hopping frequency where the Bluetooth radio device is to hop;
• and
• hop-shifting to a hopping frequency different from the overlapped hopping frequency, when the third harmonic component overlaps with the hopping frequency.

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.