Abstract
Faster-than-Nyquist (FTN) signaling is regarded as a potential candidate for improving data rate and spectral efficiency of 5G new radio (NR). However, complex detectors have to be utilized to eliminate the inter symbol interference (ISI) introduced by time-domain packing and the inter carrier interference (ICI) introduced by frequency-domain packing. Thus, the exploration of low complexity transceiver schemes and detectors is of great importance. In this paper, we consider a discrete Fourier transform (DFT) block transmission for multi-carrier FTN signaling, i.e., DBT-MC-FTN. With the aid of DFTs/IDFTs and frequency domain windowing, time- and frequency domain packing can be implemented flexibly and efficiently. At the receiver, the inherent ISI and ICI can be canceled via a soft successive interference cancellation (SIC) detector. The effectiveness of the detector is verified by the simulation over the additive white Gaussian noise channel and the fading channel. Furthermore, based on the characteristics of the efficient architecture of DFT-MC-FTN, two pilot-aided channel estimation schemes, i.e., time-division-multiplexing DBT-MC-FTN symbol-level pilot, and frequency-division-multiplexing subcarrier-level pilot within the DBT-MC-FTN symbol, respectively, are also derived. Numerical results show that the proposed channel estimation schemes can achieve high channel estimation accuracy.
Highlights
In order to meet the unprecedented requirement for high-data-rate transmission and to achieve higher spectral efficiency, non-orthogonal transmission techniques in time- and/or frequency domain have attracted worldwide attention in the academia and the industry, especially during the standardization process of the 5G new radio (NR) [1]
The mixed interference experienced at the DBT-MC-FTN receiver is composed of the inter-symbol interference (ISI) induced by the fading channel and the ISI/inter carrier interference (ICI) introduced by time-frequency packing
When it turns to the DBT-MC-FTN system with two-dimensional packing, there are off-diagonal elements in Heq due to the ISI/ICI introduced by time/frequency domain packing and ICI introduced by the filter trailing
Summary
In order to meet the unprecedented requirement for high-data-rate transmission and to achieve higher spectral efficiency, non-orthogonal transmission techniques in time- and/or frequency domain have attracted worldwide attention in the academia and the industry, especially during the standardization process of the 5G new radio (NR) [1]. [14] proposes the discrete Fourier transform (DFT) based block transmission for faster-than-Nyquist signaling (DBT-FTN) scheme where the implementation complexity of DBT-FTN system can be reduced significantly by DFT based signal generation and frequency-domain equalization (FDE) in the transmitter and receiver, respectively. A low complexity two-dimensional compression scheme called DFT based block transmission for multicarrier faster-Than-Nyquist (DBT-MC-FTN) signaling is proposed. We first propose a DFT based block transmission for multicarrier FTN signaling scheme, i.e., DBT-MC-FTN, where the two-dimensional compression in both time-domain and frequency-domain can be realized efficiently by adjusting the operation parameters. CP-based channel frequency domain equalization and soft SIC detector are deployed respectively to eliminate the ISI and ICI introduced by the channel and the two-dimensional packing in the DBT-MC-FTN signaling.
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