Reconstruction-based receiver of FTN signaling at fixed sampling rate

Abstract

Faster-than-Nyquist (FTN) signaling has attracted increasing attentions for its high spectral efficiency. The FTN signaling changes the packing ratios to improve the data rate, which unavoidably induces the intersymbol interference (ISI). Moreover, the FTN signaling requires variable symbol rates which change with the packing ratios. A number of low-complexity detection methods have been employed in the FTN signaling. However, these methods based on the variable sampling rates challenge the receiver of FTN signaling. In particular, the variable sampling rates lead more complexity in the timing synchronization. We propose a receiver based on signal reconstruction to detect FTN signal at fixed rate. The receiver adopts an interpolator to recover the signal from the samples taken at fixed rate. With the simulations, the samples taken at fixed rate would not suffer information loss and the bit error rate (BER) performance of the receiver can approach the traditional way. In particular, our receiver can be used in the adaptive transmission system based on FTN signaling flexibly for the fixed-sampling scheme can simplify the process of the channel estimation.