Experimental Study on MIMO Performance of Modulated Scattering Antenna Array in Indoor Environment

The modulated scattering antenna array (MSAA) is composed of one normal antenna element and several modulated scattering elements (MSEs). In this report, a 2-element MSAA is used as the receiving antenna in 2 × 2 multiple input multiple output (MIMO) system. MIMO performance of MSAA with various array spacing is measured to investigate the relation between the array spacing and the MIMO performance of the MSAA experimentally in the nonline-of-sight (NLOS) indoor environment. It is found that the error vector magnitude (EVM) and the channel capacity which reflect MIMO performance can be affected by the array spacing. The measured results of the MSAA were compared with that of twodipole antenna array at the same condition.