Cascaded Models for Cancellation of Air-Induced Passive Intermodulation in MIMO Transceivers

Vesa Lampu, Lauri Anttila, Matias Turunen, Marko Fleischer, Jan Hellmann, Mikko Valkama

Tutkimustuotos: KonferenssiartikkeliScientificvertaisarvioitu

4 Lataukset (Pure)


This paper describes and proposes cascaded models for the identification and cancellation of air-induced passive intermodulation (PIM) in frequency division duplex (FDD) multiple-input multiple-output (MIMO) systems. The air-induced PIM is interference which stems from nearby metallic objects outside the transceiver system. Previous works on the topic have been targeting a limited subset of the possible scenarios present in such systems, namely 2x2 MIMO operation with two parallel streams and two component carriers (CCs), totaling four distinct signals. We demonstrate that the recently proposed cascaded model utilizing spline-interpolated lookup tables for nonlinearity modeling is capable of handling the aforementioned case with low computational cost, even when channels with memory effects are considered. Furthermore, we expand the 2x2 case to include more transmit streams and CCs and develop a multi-input Hammerstein-type model with polynomial basis functions and a global filter, and accompany it with a low-complexity gradient descent-based parameter adaptation to cancel PIM in such more evolved scenarios. We evaluate the performance of the developed canceller numerically, where favorable cancellation results are shown.
OtsikkoConference Record of the 57th Asilomar Conference on Signals, Systems and Computers, ACSSC 2023
ISBN (elektroninen)979-8-3503-2574-4
ISBN (painettu)979-8-3503-2575-1
DOI - pysyväislinkit
TilaJulkaistu - 2024
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaAsilomar Conference on Signals, Systems, and Computers - Pacific Grove, Yhdysvallat
Kesto: 29 lokak. 20231 marrask. 2023


NimiAsilomar Conference on Signals, Systems, and Computers proceedings
ISSN (painettu)1058-6393
ISSN (elektroninen)2576-2303


ConferenceAsilomar Conference on Signals, Systems, and Computers
KaupunkiPacific Grove


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