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Downlink CoMP Resource Allocation Based on Limited Backhaul Capacity

China Communications 2016年第4期13卷 38-48页

作者： LI Zhuoming LIU Yuqi ZHANG Yu WU Wei School of Electronics and Information Engineering Harbin Institute of Technology Harbin China 150001 School of Computer Science and Technology Harbin Institute of Technology Harbin China 150001

Coordinated Multi-Point(CoMP) transmission is put forward in the Long Term Evolution-Advanced(LTE-A) system to improve both average and cell-edge throughput. In this paper, downlink CoMP(DL-CoMP) resource allocation scheme based on limited backhaul capacity is designed to take a tradeoff between system throughput and fairness. Resource allocation of proportional fairness based on querying table is proposed. It updates RB allocation matrix when center cell has completed resource allocation and delivers the matrix to adjacent cells for their own RB allocation. Furthermore, Water-Filling algorithm based on adaptive water level(AWF) is used for power allocation to boost system fairness. In this paper, performance of downlink CoMP based on limited backhaul capacity and single-point transmission is contrasted, and results indicate that CoMP dramatically enhances system throughput and spectral efficiency. Moreover, AWF power allocation scheme obtains higher system fairness than conventional Water-Filling(WF) algorithm, although it gets slightly lower system throughput. Finally, this paper discussed that the system performance is partially affected by the percentage of CoMP resource.

关键词： semi-dynamic cooperative set selection fixed resource partition query table proportional fairness adaptive water-filling

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Wireless positioning and path tracking for a mobile platform in greenhouse

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International Journal of Agricultural and Biological Engineering 2021年第1期14卷 216-223页

作者： Lijian Yao Dong Hu Chao Zhao Zidong Yang Zhao Zhang School of Engineering Zhejiang A&F UniversityHangzhou 311300China Department of Agricultural and Biosystems Engineering North Dakota State UniversityFargoND 58102USA

In order to realize intelligent greenhouse,an automatic navigation method for a mobile platform based on ultra-wideband(UWB)positioning technology was proposed and validated in this *** time difference of arrival(TDOA)approach was used to monitor and track the UWB positioning to obtain the localization information of the mobile platform working in a *** applying polynomial fitting for positioning error correction,the system accuracy was within 5 mm.A fuzzy controller model was constructed by incorporating the lateral and heading deviations as input variables and the steering angle of front wheel as the output variable.A fuzzy rule was established based on domain knowledge,as well as the steering angle of front wheel offline query table,which was applied to alleviate the calculative load of the *** results confirmed that the automatic navigation method proposed in this study performed satisfactorily,with a steady-state error ranging from 41 mm to 79 mm when tracking straight line,and an average error of 185 mm and an average maximum error of 532 mm when tracking *** addition,the maximum error occurred at the polygonal corner which could meet the needs of driving on the narrow road in the *** method proposed in this study provides a new systematic approach for the research of greenhouse automatic navigation.

关键词： wireless positioning ultra-wideband path tracking positioning error correction fuzzy control query table mobile platform greenhouse

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