Improved Security Schemes for LTE Power Wireless Private Communication System

Li, Wei; Dai, Yong; Li, Rui; Li, Yang; Fan, Jin; Wang, Dayang; Cai, Hao

doi:10.1109/iceiec49280.2020.9152240

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…where Λ 2 p = ω(ω − ω * pi )/ω 2 A is the usual ion polarization term, ω * pi is the thermal ion diamagnetic drift frequency, the Alfvén frequency is ω A = v A /qR, and Λ 2 nc is the neoclassical enhancement term due to thermal-ion compression. Assuming that the mode frequency ω is lower than the thermal-ion bounce and transit frequencies, Λ 2 nc is then given by [21,[44][45][46]]…”

Section: Theoretical Analysismentioning

confidence: 99%

‘BAAE’ instabilities observed without fast ion drive

et al. 2020

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The instability that was previously identified (Gorelenkov 2009 Phys. Plasmas 16 056107) as a fast-ion driven beta-induced Alfvén-acoustic eigenmode (BAAE) in DIII-D was misidentified. In a dedicated experiment, low frequency modes (LFMs) with characteristic ‘Christmas light’ patterns of brief instability linked to the safety factor evolution occur in plasmas with electron temperature T e ≳ 2.1 keV but modest beta. To isolate the importance of different driving gradients on these modes, the electron cyclotron heating (ECH) power and 80 keV, sub-Alfvénic neutral beams are altered for 50–100 ms durations in reproducible discharges. Although beta-induced Alfvén eigenmodes and reversed-shear Alfvén eigenmodes stabilize when beam injection ceases (as expected for a fast-ion driven instability), the LFMs that were called BAAEs persist. Data mining reveals that characteristic LFM instabilities can occur in discharges with no beam heating but strong ECH. A large database of over 1000 discharges shows that LFMs are only unstable in plasmas with hot electrons but modest overall beta. The experimental LFMs have low frequencies (comparable to diamagnetic drift frequencies) in the plasma frame, occur near the minimum of the safety factor q min, and appear when q min is close to rational values. Theoretical analysis suggests that the LFMs are a low frequency reactive instability of predominately Alfvénic polarization.

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Section: Theoretical Analysismentioning

confidence: 99%

‘BAAE’ instabilities observed without fast ion drive

et al. 2020

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“…Our investigation is motivated by the following new sporadic example that has been found by Shuxing Li [13] who gave his permission to publish it here. Example 6.1 The set S := x, x 3 : x ∈ F 8 is formally self dual under the trace pairing (x, y), (a, b) = (−1) Tr(ax+by) .…”

Section: Formally Self Dual Sets From Vectorial Boolean Functionsmentioning

confidence: 99%

Formal self duality

Kölsch

Schüler

2021

Cryptogr. Commun.

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We study the notion of formal self duality in finite abelian groups. Formal duality in finite abelian groups has been proposed by Cohn, Kumar, Reiher and Schürmann. In this paper we give a precise definition of formally self dual sets and discuss results from the literature in this perspective. Also, we discuss the connection to formally dual codes. We prove that formally self dual sets can be reduced to primitive formally self dual sets similar to a previously known result on general formally dual sets. Furthermore, we describe several properties of formally self dual sets. Also, some new examples of formally self dual sets are presented within this paper. Lastly, we study formally self dual sets of the form $\{(x,F(x)) \ : \ x\in {\mathbb {F}}_{2^{n}}\}$ { ( x , F ( x ) ) : x ∈ F 2 n } where F is a vectorial Boolean function mapping ${\mathbb {F}}_{2^{n}}$ F 2 n to ${\mathbb {F}}_{2^{n}}$ F 2 n .

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“…To validate our previous conclusions about the influence of the electron temperature gradient induced by magnetic islands on the QCM excitation, we have done the linear stability analysis using Extended Fluid Code (ExFC) [46] with input experimental profiles in shot 31306 (including n e , T e , T i and q. Since there was no measurement from the charge exchange recombination spectroscopy diagnostic in ohmic plasmas, we used the T i profile right after the NBI was launched.).…”

Section: Properties Of Qcmsmentioning

confidence: 99%

Modulation of the trapped electron driven turbulence by <i>m</i>/<i>n</i>=2/1 tearing mode in the core of HL-2A plasmas

Jiang

Zhong

et al. 2020

Nucl. Fusion

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Turbulent fluctuations within a quasi-coherent frequency range (peak frequency of ∼130 kHz, ∆f ≈ tens of kHz) are modulated by the rotation of low frequency tearing modes in the core of HL-2A ohmic plasmas. The quasi-coherent modes (QCMs) emerge outside the island boundary as the island O-point passes by in the large island cases (W > 4.5 cm), where the local electron temperature profile is steepened. Statistical analysis shows that for the QCM excitation, a threshold value of temperature gradient is identified and the QCM is solely observed in low density discharges, consistent with the linear ohmic confinement regime. These experimental evidence suggests that the observed QCMs are driven by the trapped electron mode, in agreement with linear stability calculations. Cross-correlation analysis reveals that the QCMs have long-range poloidal correlations and radially propagate outwards. Besides, the bispectral analysis indicates: (i) there exists non-linear coupling between the tearing mode and micro-turbulence, most significantly in the QCM frequency range; (ii) the QCMs nonlinearly couple by themselves to excite the second harmonic, whereas no non-linear interaction is observed between the QCMs and ambient turbulence.

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Improved Security Schemes for LTE Power Wireless Private Communication System

Cited by 4 publications

References 9 publications

‘BAAE’ instabilities observed without fast ion drive

‘BAAE’ instabilities observed without fast ion drive

Formal self duality

Modulation of the trapped electron driven turbulence by <i>m</i>/<i>n</i>=2/1 tearing mode in the core of HL-2A plasmas

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