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Modern radio systems and transceivers utilize carrier aggregation (CA) tomeet the demands for higher and higher data rates. However, the adoption of CAin the existing Long Term Evolution (LTE)-Advanced and emerging 5G New Radio(NR) mobile networks, in case of frequency division duplexing (FDD), may incurself-interference challenges with certain band combinations. More specifically,the nonlinear distortion products of the transmit signals or component carriers(CCs), stemming from the passive radio frequency (RF) front-end components ofthe transceiver, can appear in one or more of the configured receiver bands,potentially leading to the receiver desensitization. In this paper, we presentadvanced baseband equivalent signal models for such passive intermodulation(PIM) distortion viewed from the RX point of view, considering also potentialmemory effects in the PIM generation. Then, building on these signal models, adigital self-interference cancellation technique operating in the transceiverdigital front-end is presented. The performance of the proposed solution isevaluated with real-life RF measurements for LTE-Advanced type user equipment(UE) with dual CC inter-band CA, demonstrating excellent suppressionproperties. The findings in this work indicate that digital cancellation is afeasible approach for improving the receiver sensitivity of mobile devices thatmay be prone to RF front-end induced PIM challenges.

Digital Cancellation of Passive Intermodulation in FDD Transceivers