Faster-than-Nyquist (FTN) signaling is a non-orthogonal transmission technique, which has the potential to provide significant spectral efficiency improvement. This paper studies the capacity of FTN signaling for both frequency-flat and for frequency-selective multiple-input multiple-output (MIMO) channels. We show that precoding in time and waterfilling in space is capacity achieving for frequency-flat MIMO FTN. For frequency-selective fading, joint waterfilling in time, space and frequency is required.

翻译：超超Nyquist(FTN)信号是一种非垂直传输技术,有可能显著提高光谱效率,本文研究FTN信号在频率缩放和频率选择性多输入多输出输出(MIMO)渠道的能力,我们显示,时间和空间填水预编码是频率缩放MIMO FTN的容量。对于频率选择性淡化,需要联合在时间、空间和频率上填水。