Air-Induced PIM Cancellation in FDD MIMO Transceivers
Lampu, Vesa; Anttila, Lauri; Turunen, Matias; Fleischer, Marko; Hellmann, Jan; Valkama, Mikko (2022)
Lampu, Vesa
Anttila, Lauri
Turunen, Matias
Fleischer, Marko
Hellmann, Jan
Valkama, Mikko
2022
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202205104605
https://urn.fi/URN:NBN:fi:tuni-202205104605
Kuvaus
Peer reviewed
Tiivistelmä
In this letter, air-induced passive intermodulation (PIM) modeling and cancellation schemes are presented in a multiple-input multiple-output (MIMO) frequency-division duplexing (FDD) transceiver context. PIM is distortion generated by nonlinear passive devices either within the transmitter chain or outside the transceiver system, as is the case in air-induced PIM. In FDD systems, the PIM products may lie on the receiver band, thus possibly desensitizing the receiver chain. Unlike previous PIM cancellation works, we consider a challenging rank-2 dual-carrier MIMO transceiver scenario, with two spatially multiplexed signals per component carrier (CC). Stemming from the PIM modeling, we first present a cancellation method based on a complete set of identified basis functions (BFs). Additionally, to relax the processing complexity, we propose an alternative canceller solution with a reduced number of BFs, inspired by the problem modeling. RF measurements conducted with real-life equipment indicate favorable PIM suppression levels of up to 20 dB using both introduced techniques.
Kokoelmat
- TUNICRIS-julkaisut [16726]