Antenna Selection in Polarization Reconfigurable MIMO (PR-MIMO) Communication Systems

Seungcheol Oh, Andreas Molisch

Abstract:

Adaptation of a wireless system to the polarization
state of the propagation channel can improve reliability and
throughput. This paper in particular considers polarization
reconfigurable multiple-input multiple-output (PR-MIMO) systems, where both transmitter and receiver can change the (linear)
polarization orientation at each element of their antenna arrays.
We first introduce joint polarization pre-post coding to maximize
bounds on the capacity and the maximum eigenvalue of the
channel matrix. For this we first derive approximate closed form
equations of optimal polarization vectors at one link end, and
then use iterative joint polarization pre-post coding to pursue
joint optimal polarization vectors at both link ends. Next we
investigate the combination of PR-MIMO with hybrid antenna
selection (PR-HS-MIMO), which can achieve a remarkable improvement of channel capacity. Two novel schemes of elementwise and global polarization reconfiguration are presented for
PR-HS-MIMO. Comprehensive simulation results indicate that
the proposed schemes provide 3 – 5 dB signal-to-noise ratio (SNR)
gain in PR-MIMO and concomitant improvements of channel
capacity in PR-HS-MIMO.