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Integration of non-linear, radiation, and propagation CAD techniques for MIMO link design

Published online by Cambridge University Press:  14 December 2011

Vittorio Rizzoli
DEIS, University of Bologna, viale Risorgimento 2, 40136, Bologna.
Alessandra Costanzo*
DEIS – II School of Engineering, Cesena Campus, University of Bologna.
Diego Masotti
DEIS, University of Bologna, viale Risorgimento 2, 40136, Bologna.
Martino Aldrigo
DEIS, University of Bologna, viale Risorgimento 2, 40136, Bologna.
Francesco Donzelli
DEIS, University of Bologna, viale Risorgimento 2, 40136, Bologna.
Vittorio Degli Esposti
DEIS – II School of Engineering, Cesena Campus, University of Bologna.
Corresponding author: A. Costanzo Email:


The paper outlines an exhaustive computer-aided design (CAD) procedure for the circuit-level simulation of entire multi-input multi-output (MIMO) links. The multiple transmitting and receiving antennas are treated as multiport radiating systems characterized by electromagnetic (EM) analysis. The effects of mutual couplings in terms of the frequency-dependent near-field and far-field performance of each element are accounted for in a straightforward and rigorous way. The set of transmitters is treated as a unique non-linear system loaded by the multiport antenna, and is analyzed by non-linear circuit techniques. The same is done for the set of receivers. In order to establish the connection between transmitters and receivers, the radiated far-field is evaluated by EM analysis, and the field incident on each receiver antenna is computed by extending to the MIMO case an available ray tracing technique. EM theory is then used to describe the receiving array as a linear active multiport network. This technique allows analysis of several MIMO systems, exploiting different array element spatial locations and frequencies of operation in a straightforward and automatic way. Bit error rate (BER) computation and minimization are demonstrated at the circuit level.

Research Papers
Copyright © Cambridge University Press and the European Microwave Association 2011

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