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 point-to-point single-input single-output (SISO) and multiple-input multiple-output (MIMO) channels. Although the capacity of SISO FTN was studied previously, due to some incomplete prerequisites, the exact capacity expression was not found. In this paper we resolve these issues for SISO FTN and generalize the result to MIMO FTN. We show that joint waterfilling in time and space is capacity achieving for MIMO FTN.

翻译：快速超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信号对点到点单投入单产出(SISO)和多投入多产出(MIMO)渠道的能力,虽然以前曾研究过SISO FTN的能力,但由于一些不完全的先决条件,没有找到确切的能力表达方式。本文为SISO FTN解决这些问题,并将结果归纳为MIMO FTN。我们显示,联合在时间和空间中填水是MIMO FTN实现的能力。