Differential Feedback in MIMO Communications: Performance with Delay and Real Channel Measurements

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Executive Summary

This paper studies the performance of the authors' recently proposed differential feedback scheme for Multi-Input-Multi-Output (MIMO) communication systems using real channel measurement data. The algorithm is applied to the channel correlation matrix exploiting geodesic curves and the intrinsic geometry of positive definite Hermitian matrices. The performance of this and a conventional non-differential feedback scheme are evaluated using real data and channel measurements obtained with the Eurecom MIMO OpenAir Sounder (EMOS). Additionally, the impact of having a delay in the feedback link is also studied in terms of a loss of performance in the communication through several simulations.

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