Measurement of Time-Varying MIMO Channels and Performance Evaluation of Spatial Multiplexing

MIMO spatial multiplexing is a key technology to increase channel capacity. The performance depends on channels including antenna characteristics. In eigenbeam space division multiplexing (E-SDM), not only a receiver but also a transmitter needs channel state information (CSI). The performance of an E-SDM system may degrade in timevarying environments because CSI at the transmitter is outdated. In this paper, we describe measurement of timevarying MIMO channels in an indoor environment. Using the measured data, we obtain channel auto-correlation and Doppler spectrum, and examine bit error rate (BER) performance of E-SDM.