2021/07/01 by Ahmed Ibrahim, Ebrahim Bedeer, Ibrahim, Ahmed +3 · 1 citation
Engineering · #Advanced Power Amplifier Design #Advanced Wireless Communication Techniques #FOS: Computer and information sciences #FOS: Electrical engineering #Information Theory (cs.IT) #PAPR reduction in OFDM #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2107.00805
openalex publication_date 2021/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Faster-than-Nyquist (FTN) signaling is a promising non-orthogonal pulse\nmodulation technique that can improve the spectral efficiency (SE) of next\ngeneration communication systems at the expense of higher detection complexity\nto remove the introduced inter-symbol interference (ISI). In this paper, we\ninvestigate the detection problem of ultra high-order quadrature-amplitude\nmodulation (QAM) FTN signaling where we exploit a mathematical programming\ntechnique based on the alternating directions multiplier method (ADMM). The\nproposed ADMM sequence estimation (ADMMSE) FTN signaling detector demonstrates\nan excellent trade-off between performance and computational effort enabling\nsuccessful detection and SE gains for QAM modulation orders as high as 64K\n(65,536). The complexity of the proposed ADMMSE detector is polynomial in the\nlength of the transmit symbols sequence and its sensitivity to the modulation\norder increases only logarithmically. Simulation results show that for 16-QAM,\nthe proposed ADMMSE FTN signaling detector achieves comparable SE gains to the\ngeneralized approach semidefinite relaxation-based sequence estimation\n(GASDRSE) FTN signaling detector, but at an experimentally evaluated much lower\ncomputational time. Simulation results additionally show SE gains for\nmodulation orders starting from 4-QAM, or quadrature phase shift keying (QPSK),\nup to and including 64K-QAM when compared to conventional Nyquist signaling.\nThe very low computational effort required makes the proposed ADMMSE detector a\npractically promising FTN signaling detector for both low order and ultra\nhigh-order QAM FTN signaling systems.\n