  Faster-than-Nyquist (FTN) signaling is an attractive transmission technique
which accelerates data symbols beyond the Nyquist rate to improve the spectral
efficiency; however, at the expense of higher computational complexity to
remove the introduced intersymbol interference (ISI). In this work, we
introduce a novel FTN signaling transmission technique, named coordinate
interleaved FTN (CI-FTN) signaling that exploits the ISI at the transmitter to
generate constructive interference for every pair of the counter-clockwise
rotated binary phase shift keying (BPSK) data symbols. In particular, the
proposed CI- FTN signaling interleaves the in-phase (I) and the quadrature (Q)
components of the counter-clockwise rotated BPSK symbols to guarantee that
every pair of consecutive symbols has the same sign, and hence, has
constructive ISI. At the receiver, we propose a low-complexity detector that
makes use of the constructive ISI introduced at the transmitter. Simulation
results show the merits of the CI-FTN signaling and the proposed low-complexity
detector compared to conventional Nyquist and FTN signaling.
