On the practical benefits of faster-than-Nyquist signaling

Le, Chung; Schellmann, Malte; Fuhrwerk, Martin; Peissig, Jürgen

doi:10.1109/atc.2014.7043385

Cited by 23 publications

(4 citation statements)

References 12 publications

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“…between 0.8 dB and 1.1 dB gain. This result confirms the gain in terms of PAPR offered by some FTN configurations given by [5]. The three 8-PSK FTN configurations have the same spectral efficiency with different roll-off/compression parameters.…”

Section: Faster-than-nyquist Benefitssupporting

confidence: 82%

Trade-off between spectral efficiency increase and PAPR reduction when using FTN signaling: Impact of non linearities

Lucciardi¹,

Thomas

Boucheret

et al. 2016

2016 IEEE International Conference on Communications (ICC)

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Faster-than-Nyquist (FTN) signaling appears as an attractive method to improve spectral efficiency at the price of an increased complexity at the receiver. The receiver generally implements a turbo-equalization/detection scheme to benefit from all the promises of the FTN signaling. However, this is not the only limitation we have to deal with. Indeed, compressing in the time domain impact the emitted signal and it usually results in an increase of the envelope fluctuations. This leads to an inherent multi-objectives trade-off between performance, targeted spectral efficiency and limited Peak to Average Power Ratio (PAPR). The last aspect is crucial when considering a satellite communication link due to non-linear amplification effects that can occur on-board the satellite. Usually, FTN studies focus on spectral efficiency increase for a fixed modulation order, trying to trade-off between performance and PAPR properties. In this paper, we show that, for a given asymptotic spectral efficiency, we can compress low order modulations to increase the spectral efficiency of these schemes while controlling the PAPR increase to achieve a better PAPR than the non compressed scheme with a higher modulation order. Thus, for the same asymptotic spectral efficiency, we can achieve 1 dB gain in terms of PAPR and 2 dB gain in Bit Error Rate (BER) performances for a coded 8-PSK FTN system compared to a coded 16-APSK. For the same BER performances, the asymptotic spectral efficiency gain obtained in linear context is over 20 %, higher when nonlinearities are taken into account.

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Section: Faster-than-nyquist Benefitssupporting

confidence: 82%

Trade-off between spectral efficiency increase and PAPR reduction when using FTN signaling: Impact of non linearities

Lucciardi¹,

Thomas

Boucheret

et al. 2016

2016 IEEE International Conference on Communications (ICC)

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“…Moreover, LPE results in a broadening in the transition band and part of the spectra breaches the SEM. It is well understood that FTNS is capable of improving the system capacity without leasing additional frequency spectrum [3], [5]. Therefore, the spectral broadening contradicts the philosophy of the FTNS and neutralizes the FTN gain by a certain amount.…”

Section: B Psd and Average Power Analysismentioning

confidence: 99%

“…In (35b), we assume that R h,f is positive definite. 5 (35c) follows from the singular value decomposition (SVD) of matrix R h,f , i.e., R h,f = UΛ h U H , where U is a unitary matrix and Λ h is a diagonal matrix having the eigenvalues λ n n = 0, 1, . .…”

Section: B Ce Mse Analysis and Pilot Sequence Designmentioning

confidence: 99%

Joint Precoding and Pre-Equalization for Faster-Than-Nyquist Transmission Over Multipath Fading Channels

Wen

Liu

et al. 2022

IEEE Trans. Veh. Technol.

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Faster-than-Nyquist signaling (FTNS) has emerged as a promising technique to increase communication capacity in bandwidth-limited channels. However, the presence of FTNinduced inter-symbol interference (FTN-ISI) in the received observations, is detrimental to channel estimation (CE) and data detection in terms of computational complexity and performance. This paper copes with these problems by incorporating linear pre-equalization (LPE) and composite precoding formed by linear spectral precoding and Tomlinson-Harashima precoding (THP), into the FTNS. Specifically, LPE completely pre-equalizes the FTN-ISI, while spectral precoding resolves the LPE-caused signal spectral broadening by introducing proper artificial ISI, which is pre-equalized by THP. Channel-induced ISI, as the only ISI component in the observations, is estimated and equalized using the classical frequency-domain low-complexity schemes. We show that there are four advantages of the LPE-aided CE over the CE designed for the FTN transmissions without FTN-ISI preequalization, namely lower pilot overhead, simpler yet optimal pilot sequence design, lower mean-squared error of CE, and more robust against the FTN-ISI. Simulation results show that our scheme improves the performance of CE and detection, compared to existing FTN frequency-domain CE and equalization schemes.

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“…Unfortunately, since the serious intersymbol interference (ISI) and intercarrier interference (ICI) introduced by time packing and frequency packing in MFTN signaling, current researches about MFTN mainly focus on spectral efficiency and signal detection algorithms [10]- [13]. For example, a soft input and soft output (SISO) frequency domain equalization detection algorithm was proposed in [10].…”

Section: Introductionmentioning

confidence: 99%

Low-Complexity Partial Transmit Sequence Methods Using Dominant Time-Domain Samples for Multicarrier Faster-Than-Nyquist Signaling

2019

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In Multicarrier faster-than-Nyquist (MFTN) systems, one of the most important problems of MFTN signaling is high peak-to-average power ratio (PAPR). In this paper, partial transmit sequence (PTS) method is adopted to resolve this problem, and we focus on reducing the computational complexity of it. First, the PTS method combined with alternative signal (AS) is introduced to overcome the overlapping structure of MFTN signaling. Then, due to the dominant time-domain samples of MFTN signaling are used, a new metric which can select dominant time-domain samples accurately is proposed. Based on that, two low-complexity PTS methods are proposed. To further reduce the computational complexity, by analyzing the position distribution of sample with peak power, part of the samples are removed from the procedure of calculating metric for selecting dominant time-domain samples. Simulation results confirm that the proposed low-complexity PTS methods can effectively reduce computational complexity without degrading the PAPR reduction performance. INDEX TERMS Multicarrier faster-than-Nyquist (MFTN), peak-to-average power ratio (PAPR), partial transmit sequence (PTS), dominant time-domain samples. AIJUN LIU received the B.S. degree in microwave communications and the M.S. and Ph.D. degrees in communications engineering and information systems from the

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On the practical benefits of faster-than-Nyquist signaling

Cited by 23 publications

References 12 publications

Trade-off between spectral efficiency increase and PAPR reduction when using FTN signaling: Impact of non linearities

Trade-off between spectral efficiency increase and PAPR reduction when using FTN signaling: Impact of non linearities

Joint Precoding and Pre-Equalization for Faster-Than-Nyquist Transmission Over Multipath Fading Channels

Low-Complexity Partial Transmit Sequence Methods Using Dominant Time-Domain Samples for Multicarrier Faster-Than-Nyquist Signaling

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