Long‐range Loran‐C ground‐wave propagation prediction based on adaptive moving window finite‐difference time‐domain method with compute unified device architecture parallel computing techniques

Zhou, Lili; Mu, Zhonglin; Pu, Yurong; Xi, Xiaoli

doi:10.1049/iet-map.2014.0312

Cited by 12 publications

(2 citation statements)

References 20 publications

(32 reference statements)

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“…The use of moving window with a pulse excitation source limits processing to the sliding area with the most energy. It is a promising way to accelerate simulations over electrically large domains, with examples including tunnels [55], modelling wave propagation over the ocean [56] (40 m in three dimensions), and the prediction of Loran-C 100 kHz Gaussian modulated pulse ground wave along 400 km long path [57].…”

Section: Large-scale Applicationsmentioning

confidence: 99%

Viability of Numerical Full-Wave Techniques in Telecommunication Channel Modelling

Novak

2020

J. commun. softw. syst. (Online)

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In telecommunication channel modelling the wavelength is small compared to the physical features of interest, therefore deterministic ray tracing techniques provide solutions that are more efficient, faster and still within time constraints than current numerical full-wave techniques. Solving fundamental Maxwell's equations is at the core of computational electrodynamics and best suited for modelling electrical field interactions with physical objects where characteristic dimensions of a computing domain is on the order of a few wavelengths in size. However, extreme communication speeds, wireless access points closer to the user and smaller pico and femto cells will require increased accuracy in predicting and planning wireless signals, testing the accuracy limits of the ray tracing methods. The increased computing capabilities and the demand for better characterization of communication channels that span smaller geographical areas make numerical full-wave techniques attractive alternative even for larger problems. The paper surveys ways of overcoming excessive time requirements of numerical full-wave techniques while providing acceptable channel modelling accuracy for the smallest radio cells and possibly wider. We identify several research paths that could lead to improved channel modelling, including numerical algorithm adaptations for large-scale problems, alternative finite-difference approaches, such as meshless methods, and dedicated parallel hardware, possibly as a realization of a dataflow machine.

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Section: Large-scale Applicationsmentioning

confidence: 99%

Viability of Numerical Full-Wave Techniques in Telecommunication Channel Modelling

Novak

2020

J. commun. softw. syst. (Online)

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“…Many people have used MW-FDTD to solve the EM propagation problem. Yang Xiaoshuan has done a research on EMP propagation in tunnel with MW-FDTD [1], Lili Zhou has done a research on longrange ground-wave propagation with MW-FDTD [2].…”

Section: Introductionmentioning

confidence: 99%

Application of MW-FDTD to simulate the EM wave propagation over ocean with OpenCL

Duan

Sun

Zhao

et al. 2016

2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Elect

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To simulate the EM wave propagation over ocean with FDTD, large memory and large computational quantity is needed. To reduce the memory usage, moving-window FDTD (MW-FDTD) is involved. By moving the calculation window which includes most energy of the EM wave, the necessary memory is much less than traditional FDTD method. To increase the simulation speed, an AMD R7 260X GPU is used and OpenCL is used as the GPU programming interface.The simulation acceleration ratio can be over 10 while the simulation code of a 4-core CPU is compiled with OpenMP.The FFT method is used to model oceans specified with a certain wind speed and a wind direction.

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Analysis of Cross-Rate Interference Cancelation by Use of a Novel Phase Code Interval in Loran Navigation System

Bayat

Madani

2017

J Inst Navig

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This work concentrates on improving performance of the Loran system with rejection of cross-rate interference (CRI) by the use of a new phase code interval, the so-called Bayat Phase Code Interval (BPCI), and on the signal in the frequency domain. Indeed, interference will be canceled by removing the common spectral lines between main and interference chains in all integer coefficients of the greatest common divisor frequency of two code intervals. In addition, all interference originating from sky waves that have delay greater than 700 μs is removed by employing both the presented phase code and averaging algorithm. The results demonstrate that if the design is desirable, in the sense that the inverse of the greatest common divisor of BPCI of the considered chain with adjacent interfering chains is equal to an integer multiple of 0.5 kHz, then the proposed BPCI rejects all of the spectral lines of the undesired chain.

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Long‐range Loran‐C ground‐wave propagation prediction based on adaptive moving window finite‐difference time‐domain method with compute unified device architecture parallel computing techniques

Cited by 12 publications

References 20 publications

Viability of Numerical Full-Wave Techniques in Telecommunication Channel Modelling

Viability of Numerical Full-Wave Techniques in Telecommunication Channel Modelling

Application of MW-FDTD to simulate the EM wave propagation over ocean with OpenCL

Analysis of Cross-Rate Interference Cancelation by Use of a Novel Phase Code Interval in Loran Navigation System

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