Spatial correlation beamforming scheme for MISO channel emulation

Temporal and spatial correlation are inherent mobile wireless channel characteristics that determine multiple-input multiple-output (MIMO) systems performance. Wireless test beds, which are developed to assess MIMO techniques under these realistic conditions, are usually placed in indoor laboratories where wireless channels are intrinsically quasi-static. In this paper we propose a methodology for emulating multiple-input single-output (MISO) channels with arbitrary distributions as well as spatial correlation characteristics. This methodology, based on time-varying beamforming, allow us to evaluate MISO techniques in controlled channel conditions. Moreover, it has been implemented and tested over a commercial MIMO test bed.