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CoMP-transmission-based energy-efficient scheme selection algorithm for LTE-A systems

Journal of Southeast University(English Edition) 2015年第3期31卷 297-303页

作者：童恩龚淑蕾潘志文尤肖虎东南大学移动通信国家重点实验室南京210096 南京大学电子科学与工程学院南京210013

In order to achieve higher system energy efficiency （EE）,a new coordinated multipoint （CoMP）-transmission-based scheme selection energy saving （CTSES）algorithm is proposed for downlink homogeneous cellular *** problem is formulated as an optimization of maximizing system EE,under the constraints of the data rate requirement and the maximum transmit *** problem is decomposed into power allocation and alternative scheme selection *** power allocation is calculated for CoMP-JT （joint transmission）and CoMP-CS （coordinated scheduling） transmissions,and the scheme with higher EE is chosen. Since the optimal problem is a nonlinear fractional optimization problem for both CoMP transmission schemes, the problem is transformed into an equivalent problem using the parametric method. The optimal transmit power and optimal EE are obtained by an iteration algorithm in CoMP-JT and CoMP-CS *** results show that the proposed algorithm offers obvious energy-saving potential and outperforms the fixed CoMP transmission *** the condition of the same maximum transmit power limit,the empirical regularity of user distribution for scheme choice is presented, and using this regularity, the computational complexity can be reduced.

关键词： energy efficiency green radio coordinated multipoint scheme selection nonlinear fractional programming

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An approach for choosing discretization schemes and grid size based on the convection-diffusion equation

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Applied Mathematics and Mechanics(English Edition) 2018年第6期39卷 877-890页

作者： Lin ZHOU Zhenghong GAO Yuan GAO School of Aeronautics Northwestern Polytechnical University

A new approach for selecting proper discretization schemes and grid size is presented. This method is based on the convection-diffusion equation and can provide insight for the Navier-Stokes equation. The approach mainly addresses two aspects, i.e., the practical accuracy of diffusion term discretization and the behavior of high wavenum- ber disturbances. Two criteria are included in this approach. First, numerical diffusion should not affect the theoretical diffusion accuracy near the length scales of interest. This is achieved by requiring numerical diffusion to be smaller than the diffusion discretization error. Second, high wavenumber modes that *** smaller than the length scales of interest should not be amplified. These two criteria provide a range of suitable scheme combinations for convective flux and diffusive flux and an ideal interval for grid spacing. The effects of time discretization on these criteria are briefly discussed.

关键词： convection-diffusion equation cell ReynOlds number diffusion term accu-racy high wavenumber mode scheme selection

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Analysis and Comparison of Slope-cutting Widening schemes in Highway Reconstruction and Expansion Project Based on MIDAS Software

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Journal of Architectural Research and Development 2024年第2期8卷 75-83页

作者： Zhiqiang Qiu Yun Shi Lei Jiang China Merchants Chongqing Communications Technology Research&Design Institute Co. Ltd.Chongqing 400067China

In this paper,the geological condition of the right-side slope of the K114+694–K115+162 section of Yong-tai-wen Expressway is investigated and analyzed with the results showing that the strength of rock mass is the main contributor to the stability of the ***,two widening schemes are proposed,which are the steep slope with strong support and the gentle slope with general support *** static/slope module of MIDAS GTS finite element analysis software and the strength reduction method were used to compare the two *** results show that the steep slope with a strong support scheme has obvious advantages in land requisition,environmental protection,and safety and is more suitable for reconstructing and expanding the highway slope.

关键词： Highway reconstruction and expansion Slope excavation MIDAS GTS scheme selection

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