Time–space MIMO system with faster-than-nyquist signaling in frequency-selective fading channel

The time–space receive transformation (TSRT) is proposed to increased the achievable rate of the time–space multiple-input-multiple-output (MIMO) system (where the signals received at different time instants and spatial spots are jointly processed) with faster-than-Nyquist (FTN) signaling (where the symbol rate is higher than the Nyquist rate) in the frequency-selective fading channel. It is shown that for the TSRT base MIMO system with FTN signaling, the interference from other blocks can be ineffective so that its achievable rate increases with the ratio of the symbol rate to the Nyquist rate and can reach the maximal information rate of the time–space MIMO system. It is also shown that with FTN signaling, the achievable rate of the TSRT base MIMO system is larger than that of the trailing-zeros based MIMO system and the OFDM based MIMO system, and the ratio of the symbol rate to the Nyquist rate increases this advantage.