Angular Domain Processing for MIMO Wireless Systems With Non-Uniform Antenna Arrays

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Executive Summary

Many recent works have proposed spatial channel models for MIMO applications in the 1 to 10 GHz band. However, recent attention has shifted to the 60 GHz regime where the opening up of the spectrum has created new opportunities for multi-antenna communications. With a broad focus on the 60 GHz regime, the authors revisit MIMO channel modeling in the classical setting and propose an angular domain decomposition of the channel in this paper. In the special case of non-uniform linear arrays, this proposal corresponds to non-uniformly partitioning the angular domain commensurate with the non-uniformity structure of the arrays and estimating the channel gains in each partition with a multi-window spectral estimator.

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