Behavioral Modeling and Linearization of Crosstalk and Memory Effects in RF MIMO Transmitters

• Published in: IEEE transactions on microwave theory and techniques Vol. 62; no. 4; pp. 810 - 823
• Main Authors: Amin, Shoaib, Landin, Per N., Handel, Peter, Rönnow, Daniel
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 1995; Amplifiers; Applied sciences; ARCHITECTURE; Behavioral modeling; Circuit properties; COMPENSATION; Crosstalk; digital pre-distortion (DPD); DIGITAL PREDISTORTION; Electric, optical and optoelectronic circuits; Electronic circuits; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; EN HW; Exact sciences and technology; Kernel; Mathematical model; Mean square errors; MIMO; multiple-input multiple-output (MIMO); nonlinear and linear crosstalk; NONLINEAR-SYSTEMS; P39; POLYNOMIALS; power amplifiers (PAs); POWER-AMPLIFIERS; PROCEEDINGS OF THE IEEE; Radio frequency; Radiocommunications; Telecommunications; Telecommunications and information theory; Transmitters; Transmitters. Receivers; V83; VOLTERRA; Performance evaluation; MIMO system; Crosstalk; Transmitter; Behavioral modeling; Power electronics; multiple-input multiple-output (MIMO); Adjacent channel; Behavior model; Modeling; Mean square error; nonlinear and linear crosstalk; RF; Behavioral analysis; power amplifiers (PAs); SISO system; Power amplifier; Memory effect; Signal distortion; Comparative study; Linearization; digital pre-distortion (DPD)
• ISSN: 0018-9480; 1557-9670; 1557-9670
• DOI: 10.1109/TMTT.2014.2309932

This paper proposes three novel models for behavioral modeling and digital pre-distortion (DPD) of nonlinear 2 × 2 multiple-input multiple-output (MIMO) transmitters in the presence of crosstalk. The proposed models are extensions of the single-input single-output generalized memory polynomial model. Three types of crosstalk effects were studied and characterized as linear, nonlinear, and nonlinear & linear crosstalk. A comparative study was performed with previously published models for the linearization of crosstalk in a nonlinear 2 × 2 MIMO transmitter. The experiments indicate that, depending on the type of crosstalk, the selection of the correct model in the transmitter is necessary for behavioral modeling and sufficient DPD performance. The effects of coherent and partially noncoherent signal generation on the performance of DPD were also studied. For crosstalk levels of -30 dB, the difference in the normalized mean square error and adjacent channel power ratio was found to be 3-4 dB between coherent and partially noncoherent signal generation.