MIMO SVD-Based Multiplexing With Imperfect Channel Knowledge

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Executive Summary

In narrowband Multiple-Input Multiple-Output (MIMO) communication systems with perfectly known Channel State Information (CSI), the Singular Value Decomposition (SVD) is commonly used to decompose the MIMO channel into independent single-input single-output sub-channels. In theory, optimal interference-free data multiplexing may then be carried out using the sub-channel power levels provided by the well-known water-filling solution. In practice, however, when finite codebooks are used and perfect CSI is unavailable, adaptations to power levels and bit-loading schemes are often needed to maintain reasonable performance.

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