Efficient SVD-Based Transmission Strategy against High-Speed Mobility in TDD MIMO Systems

The performance of a system, which uses singular value decomposition (SVD) over a multiple-input multiple-output (MIMO) channel, depends on the accuracy of the channel state information (CSI) at the transmitter and the receiver. And although, SVD-based transmission can be done without any feedback by utilizing the channel reciprocity in time-division duplex (TDD) systems, the CSI at the transmitter is always outdated in time-varying channels, especially in the high-speed mobility cases. As in such cases, a typical system employing conventional SVD-based transmission will suffer great degradation in both capacity and BER performance, due to the interference among the sub-channels. So, a more efficient SVD-based transmission strategy against high-speed mobility is proposed in this paper. Compared with other transmission schemes, the novel transmission scheme can achieve significant performance improvement with lower computation complexity. And the simulation results do indicate that the proposed scheme is more robust against the outdated CSI. Besides, the analysis of both signal to interference-plus-noise ratio (SINR) and computation complexity are provided.