Robust MIMO-OFDM E-SDM Systems With Low Complexity in Time-Varying Indoor Fading Environments

The performance of MIMO-OFDM E-SDM systems may be seriously degraded in time-varying fading environments due to a channel transition. In the paper, we propose two methods of channel extrapolation to compensate for the channel change. Futhermore, we also consider a method to reduce the amount of header signal and the computational complexity for the systems. We conducted MIMO measurement campaigns at a 5.2 GHz frequency band to evaluate the system performance. Simulation results based on the measured channel data show that robust bit-error rate performance can be obtained by using our channel prediction methods in both line-of-sight (LOS) and non- LOS environments. It is also shown that the method of reducing the amount of header signal and the computational complexity may be used in the practical implementation point of view.