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Back to Single-Carrier for Beyond-5G Communications above 90GHz : Novel Index Modulation techniques for low-power Wireless Terabits system in sub-THz bands

Abstract : Wireless Terabits per second (Tbps) link is needed for the new emerging data-hungry applications in Beyond 5G (B5G). Besides, the sub-THz bands are the next frontier for B5G due to scarce and limited bandwidth at lower frequencies. Even though a wider bandwidth and large-scale MIMO are envisioned, but the system and waveform design should consider the channel characteristics, technological limitations, and high RF impairments. Hence, we proposed to use an energy-efficient single carrier modulation with spectral-efficient Index Modulation (IM) and MIMO. First, Spatial Multiplexing (SMX) and Generalized Spatial Modulation (GSM) are studied. We reduced their optimal detection complexity by 99% and the spatial correlation effect on GSM. Then, we proposed dual-polarized (DP)-GSM that provides higher spectral efficiency (SE) via multi-dimensional IM and helps with the latter problem. Afterwards, we proposed the novel filter IM domain that generalizes most existing SISO schemes. We also proposed two novel schemes (Filter Shapes IM (FSIM) and Quadrature FSIM) with their optimal low complexity detectors and specialized equalizers to enhance SE and energy efficiency (EE). Striving for more SE/EE improvement, this IM domain is exploited in MIMO context. To conclude, the proposed SMX-FSIM is compared in sub-THz environment to the previous candidates. The results confirm that SMX-FSIM is the most promising solution for wireless Tbps due to its high SE/EE, robustness to RF impairments, low power consumption, and low complexity/cost with a linear receiver. Finally, the challenging filter bank design imposed by the filter IM domain is tackled by optimization to achieve better results.
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https://tel.archives-ouvertes.fr/tel-03155646
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Submitted on : Wednesday, February 9, 2022 - 8:08:08 PM
Last modification on : Wednesday, April 27, 2022 - 3:56:12 AM

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  • HAL Id : tel-03155646, version 3

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Majed Saad. Back to Single-Carrier for Beyond-5G Communications above 90GHz : Novel Index Modulation techniques for low-power Wireless Terabits system in sub-THz bands. Signal and Image processing. CentraleSupélec, 2020. English. ⟨NNT : 2020CSUP0009⟩. ⟨tel-03155646v3⟩

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