Patent ID: 6510308
Filing Date: 2003-01-21
Classification: H04B

Abstract:
A mobile communication device, comprising:a first sub-unit for receiving input signals at a predetermined input level; a second sub-unit including an antenna for transmitting output signals at an output level that is large compared to said input level of said first sub-unit; a branch off unit adapted to branch off a part of said output signal before said antenna of said second sub-unit; and an interference suppression unit adapted to receive said branched off part of said output signal and to derive an interference compensation signal therefrom through attenuation and subsequent phase shifting for subsequent supply to a superposition unit which is adapted to receive said input signal of said first sub-unit; wherein said first sub-unit is a positioning system receiver unit for receiving a signal for a localization, said second sub-unit is a mobile communication system unit for outputting a transmission signal according to a related communication standard, and said interference suppression unit includes: a controllable attenuator tunable according to said attenuation/amplification of said output signal after branch off between said branch off unit and said superposition unit; and a controllable phase shifter tunable according to said phase shift of said output signal after branch off between said branch off unit and said superposition unit such that said signal level at said output of said superposition unit is minimized, wherein one or both of said controllable attenuator and said controllable phase shifter are tuned to compensate for time variant external influences through minimizing said signal level at the output of said superpositioning unit using a signal strength indicator implemented using a detector diode at the input of the first sub-unit.