A double differential space-frequency MIMO precoding scheme of LTE in high-speed railway environment

The next-generation LTE standards operating on high-speed trains faces the problems about fast time-selective and frequency-selective channel. Precoding relying on accurate channel information at the transmitter or receive feedback will be less effective in such scenarios. Based on WINNER D2a channel model for high-speed railway, double differential space- frequency precoding scheme is proposed. Double differential space-frequency block coding is introduced into frequency domain in an OFDM system. It does not require any channel state information, with low complexity and antenna diversity gains at the transceiver. More importantly, the scheme should be robust to handle doppler shift It's shown that the proposed scheme keeps good performance in the WINNER D2a channel for high-speed railway.