| 摘要 |
This application is concerned with reducing interference caused to a receiver due to passive intermodulation (PIM) products. A received signal (C3 + I3) is affected by interference (I3, Fig. 1) resulting from non-linear products of components of a first transmit signal (C1, Fig. 1) and a components of a second transmit signal (C2, Fig. 1). A simulated interference signal 46 comprising at least one simulated non-linear product term is generated and used to cancel the interference. Generation of the simulated interference signal involves first producing a complex composite baseband signal, A, comprising baseband versions 40, 42 of at least the first signal and the second signal, and then applying one or more non-linear functions 74 to the composite signal. The first and second baseband signals are shifted in frequency 70 to ensure there is no overlap between a frequency range of the first baseband signal and a frequency range of the second baseband signal. |
