A Novel Low Complexity Faster-than-Nyquist (FTN) Signaling Detector for Ultra High-Order QAM

Faster-than-Nyquist (FTN) signaling is a promising non-orthogonal pulse modulation technique that can improve the spectral efficiency (SE) of next generation communication systems at the expense of higher detection complexity to remove the introduced inter-symbol interference (ISI). In this paper, w...

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Bibliographic Details
Published in:IEEE open journal of the Communications Society 2021, Vol.2, p.2566-2580
Main Authors: Ibrahim, Ahmed, Bedeer, Ebrahim, Yanikomeroglu, Halim
Format: Article
Language:English
Subjects:
ADMM
Communications systems
Complexity
Complexity theory
Computing time
Detectors
Estimation
faster-than-Nyquist (FTN) signaling
intersymbol interference (ISI)
Mathematical programming
Modulation
Phase shift keying
Polynomials
Pulse modulation
Quadrature amplitude modulation
Quadrature phase shift keying
Receivers
Sensors
sequence estimation
Signalling systems
ultra high-order QAM
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Summary:Faster-than-Nyquist (FTN) signaling is a promising non-orthogonal pulse modulation technique that can improve the spectral efficiency (SE) of next generation communication systems at the expense of higher detection complexity to remove the introduced inter-symbol interference (ISI). In this paper, we investigate the detection problem of ultra high-order quadrature-amplitude modulation (QAM) FTN signaling where we exploit a mathematical programming technique based on the alternating directions multiplier method (ADMM). The proposed ADMM sequence estimation (ADMMSE) FTN signaling detector demonstrates an excellent trade-off between performance and computational effort enabling successful detection and SE gains for QAM modulation orders as high as 64K (65,536). The complexity of the proposed ADMMSE detector is polynomial in the length of the transmit symbols sequence and its sensitivity to the modulation order increases only logarithmically. Simulation results show that for 16-QAM, the proposed ADMMSE FTN signaling detector achieves comparable SE gains to the generalized approach semidefinite relaxation-based sequence estimation (GASDRSE) FTN signaling detector, but at an experimentally evaluated much lower computational time. Simulation results additionally show SE gains for modulation orders starting from 4-QAM, or quadrature phase shift keying (QPSK), up to and including 64K-QAM when compared to conventional Nyquist signaling. The very low computational effort required makes the proposed ADMMSE detector a practically promising FTN signaling detector for both low order and ultra high-order QAM FTN signaling systems.
ISSN:2644-125X
2644-125X
DOI:10.1109/OJCOMS.2021.3126805