Symbol-by-symbol detection for faster-than-Nyquist signaling aided with frequency-domain precoding

Faster-than-Nyquist signaling is a promising waveform scheme in the fifth generation mobile communications for achieving higher spectrum efficiency. However, the FTN-caused intentional intersymbol interference will make the dectection process more complex. In this paper, a new precoding scheme is proposed for faster-than-Nyquist (FTN) signaling system aiming at reducing the burden of the receiver. Aided with the proposed frequency-domain precoding at the transmitter, the receiver can estimate the transmitted symbols by performing the symbol-by-symbol detection, which reduces the detection complexity dramatically. Moreover, the proposed precoding method can be applied into the high-order modulation directly, such as M-PSK or M-QAM. Further, the performance of proposed precoding scheme for FTN is verified and tested. Numerical results demonstrate that the proposed precoding scheme can not only realize symbol-by-symbol detection without bit-error-rate (BER) loss but also not broaden the spectrum of FTN signal at the transmitter.