Patent ID: 7280811

Claim:
A multimode wireless terminal comprising: a first wireless transmitter-receiver unit which conducts communication with a first wireless network system; a second wireless transmitter-receiver unit which conducts communication with a second wireless network system; a communication processor unit connected to said first and second wireless transmitter-receiver units; and an antenna switch unit which separates a received signal supplied from an antenna into components according to frequency bands, distributing the components to said first and second wireless transmitter-receiver units, and outputting transmission signals supplied from said first and second wireless transmitter-receiver units to the antenna, wherein, while conducting communication with the second wireless network system via said second wireless transmitter-receiver unit, said communication processor unit monitors a level of a signal received from the first wireless network system via said first wireless transmitter-receiver unit, and wherein said communication processor unit determines whether the level monitoring is interfered with by the transmission signal, on the basis of a relation between a transmission frequency supplied to the second wireless network system and a reception frequency supplied from the first wireless network system, and if interference occurs, said communication processor unit changes circuit characteristics of said first or second wireless transmitter-receiver unit and thereby suppresses the interference, said first wireless transmitter-receiver unit comprises an amplifier which amplifies the received signal supplied from said antenna switch unit, a variable output local oscillator, and a frequency mixer which mixes an output of said amplifier with a local oscillator signal output from said variable output local oscillator, and said communication processor unit controls an output level of said variable output local oscillator, and thereby suppresses the interference.