Why Does the Kronecker Model Result in Misleading Capacity Estimates?

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Executive Summary

Many recent works that study the performance of Multi-Input Multi-Output (MIMO) systems in practice assume a Kronecker model where the variances of the channel entries, upon decomposition on to transmit and to receive eigen-bases, admit a separable form. Measurement campaigns, however, show that the Kronecker model results in poor estimates for capacity. Motivated by these observations, a channel model that does not impose a separable structure has been recently proposed and shown to fit the capacity of measured channels better. In this paper, the authors show that this recently proposed modeling framework can be viewed as a natural consequence of channel decomposition on to its canonical coordinates, the transmit and/or the receive eigen-bases.

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