A Low-Complexity Subarray-Based UCCA for Robust LoS MIMO Communications

In line-of-sight (LoS) communication environments, geometrical placement and adjustment of antennas are crucial to improving achievable rates while ensuring robust communication performances for varying transmission distances between transmitter and receiver. In this paper, hence, we propose a novel low-complexity subarray-based uniform circular concentric array (UCCA) selection technique for robust line-of-sight (LoS) MIMO communication systems. In particular, we dynamically control the allocated power to each antenna of UCCA at the transmitter while the conventional schemes only consider the radius and the relative rotation angle of UCCA. Through extensive computer simulations, we show that the proposed subarray-based UCCA selection technique significantly outperforms the conventional scheme in terms of achievable rate and robustness for varying transmission distances in practical LoS MIMO communication environments.