Digital Compensation of Cross-Modulation Distortion in Multimode Transceivers

In a multimode transceiver, the transmitter for one communication standard induces a large interference on the receiver for another one. When this large interference passes through the inherently nonlinear receiver Front-End (FE), it introduces Cross- Modulation (CM) distortion. Increasing the FE linearity to lower the CM distortion leads to unacceptable power consumption for a handheld device. Considering the continuous increase of digital computation power governed by Moore´s law an attractive alternative approach is to digitally compensate for the CM distortion. An existing CM compensation method is tailored to single-mode transceivers and requires an auxiliary FE. By using the locally available transmitted interference in the multimode transceiver, we propose a CM compensation method which requires no additional analog hardware. Hence the power consumption and complexity of the multimode transceiver will be reduced significantly.