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Limited feedback based double-sided full-dimension MIMO for mobile backhauling

We consider wireless backhauling in mobile networks, employing large-scale full-dimension MIMO antenna arrays on both sides of the link. Our focus is on design strategies for transmit and receive antenna combiners, assuming FDD transmission and limited feedback operation. We investigate the performance of two competing philosophies: 1) An algebraic approach in which antenna combiners are calculated from explicit channel state information; 2) A geometric approach that utilizes implicit geometric information, such as, signal arrival/departure angles, to determine antenna combiners. We propose a geometric precoding approach that provides robustness with respect to user movement and investigate merits of both schemes.