Study on Fault Feature Extraction of Rolling Bearing Based on Improved WOA-FMD Algorithm by Guangfei Jia, Yanchao Meng

“…Therefore, a fault feature extraction method based on improved whale optimization algorithm is proposed to optimize feature modal decomposition parameters. …”
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Dynamic power control scheme for C-V2X communication with channel inversion by Jieping ZHAI, Xiaolan LIU, Hailin XIAO

“…In cellular vehicle-to-everything（C-V2X）system, V2V（vehicle-to-vehicle）-based communication utilizes the spectrum resource of cellular users（CUE）to reduce the load of base stations, and thus realize partial near-field V2V communication.Although the V2V-based communication can improve the transmission rate of system, it causes co-frequency interference.To solve the problem, a dynamic power control scheme with channel inversion was proposed.In this scheme, channel inversion power control on V2V users（VUE）was performed to compensate the truncation interruption caused by limited transmission power in the non-truncated area, where the co-frequency interference between cellular users and V2V users was solved through dynamic power control.Furthermore, the optimal dual solution of objective function was obtained by Lagrange multiplier method and the optimal power allocation was carried out for cellular users and V2V users by bisection method, which met the rate requirements of all cellular users.Finally, the total transmission rate of V2V users was maximized.Numerical simulation results were shown that when the total outage probability of V2V users was 0.866, the proposed scheme was promoted by 48%.…”
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A GNSS Anti-jamming Technology of UAV for Geological Hazard Monitoring by ZHANG Yonggang, ZHOU Chaorong, SHEN Feng

“…The extended steering vector is overlapped as the constraint of the optimal adaptive filtering criterion. Based on which, the optimal weight vector is solved to reduce the loss of BOC signal when the space-time filter suppresses jamming. …”
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Resource allocation strategies for improved mayfly algorithm in cognitive heterogeneous cellular network by Damin ZHANG, Yi WANG, Chengcheng ZOU, Peiwen ZHAO, Linna ZHANG

“…Aiming at the optimization of uplink resource allocation in cognitive heterogeneous cellular networks, a resource allocation algorithm based on improved discrete mayfly algorithm was proposed.In the cognitive heterogeneous cellular network model, the power control strategy was introduced to control the interference suppression of transmitted power, and the improved discrete mayfly algorithm was used to optimize and solve the optimal distribution scheme based on the user’s quality of service (QoS) requirements and interference threshold constraints to maximize the energy efficiency (EE).In order to improve the convergence rate and search ability of the mayfly algorithm, the dynamic adaptive weights of incomplete Gamma and Beta distribution functions and the golden sine position updating strategy were introduced.The simulation results show that the closed-loop power control based on SINR can dynamically adjust the transmitting power of users and effectively restrain the interference between users.The GSWBMA has good optimization efficiency and convergence performance to solve the resource allocation problem, effectively improve the energy efficiency of the system and the transmission rate of users, and ensure the QoS requirements of users.…”
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Cache Assignment for a Flexible Mobile User in Wireless Heterogeneous Networks by Mohammad Hossein Amerimehr, Parisa Eslami, Nahid Amani, sara Efazati

“…Moreover, in the system model, the interference and the mobility of users are considered. …”
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Joint power control and user grouping for uplink power domain non-orthogonal multiple access by Bilal Ur Rehman, Mohammad Inayatullah Babar, Arbab Waheed Ahmad, Hesham Alhumyani, Gamil Abdel Azim, Rashid A. Saeed, Sayed Abdel Khalek

“…Owing to the combinatorial nature of the underlying optimization problem involving user pairing/grouping scheme, power control and decoding order, the computational complexity in determining optimal and sub-optimal solutions remains considerably high. …”
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Power allocation of hybrid spectrum sharing based on the spatial location by Yan CAI, Jing ZHANG, Hong-bo ZHU

“…Considering the different location of sec-ondary user, the interference received by primary receiver was analyzed and the work regions of the overlay and underlay were deduced under the primary user average interference constraint. …”
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Pilot scheduling algorithm based on cell classification-cross entropy for massive MIMO by Yinhui YU, Heng ZHOU, Ying YANG, Hao PAN, Jiapeng REN

“…Pilot scheduling problem belongs to the arrangement optimization problem, and the algorithm computational complexity of greedy algorithm to search the optimal solution is greatly. …”
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Pilot scheduling algorithm based on cell classification-cross entropy for massive MIMO by Yinhui YU, Heng ZHOU, Ying YANG, Hao PAN, Jiapeng REN

“…Pilot scheduling problem belongs to the arrangement optimization problem, and the algorithm computational complexity of greedy algorithm to search the optimal solution is greatly. …”
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Differentiated GNSS Baseband Jamming Suppression Method Based on Classification Decision Information by Zhongliang Deng, Zhichao Zhang, Xiangchuan Gao, Peijia Liu

“…Traditional generic suppression methods struggle to achieve global optimization tailored to specific interference mechanisms. …”
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Collaborative Relay Beamforming Based on Minimum Power for M2M Devices in Multicell Systems by Xiaoning Zhang, Da Wang, Lin Bai, Chen Chen

“…However, in themulticell system multiple M2M type devices at the edge of a cell may suffer from the strong interference that consists of the intercell interference from other cells and the intracell interference from other M2M devices in the local cell. …”
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Beam Discovery Signal-Based Beam Selection in Millimeter Wave Heterogeneous Networks by Bo Yin, Yanbo Chen, Zufan Zhang, Mengjun Wang, Shaohui Sun

“…In addition, in mmWave heterogeneous networks with densely deployed small cells, strong interference beams are determined through inter-cell cooperation, and orthogonal codes are allocated to the optimal beams and strong interference beams to reduce beam interference from adjacent cells. …”
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Minimization of Outage Probability using Joint Channel and Power Assignment in Dual and Multi Hop Cognitive Radio Ad Hoc Networks by Majid Shakeri, Nahid Ardalani, Pouya Derakhshan

“…The main goal is to minimize the outage probability and increasing the length of your network life time, while simultaneously observing the transmission power constraints and the threshold of interference with the primary user. This problem was solved using the standard technique of solving convex optimization problem and weighted bipartite matching. …”
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Minimum Variance Distortionless Response Beamformer with Enhanced Nulling Level Control via Dynamic Mutated Artificial Immune System by Tiong Sieh Kiong, S. Balasem Salem, Johnny Koh Siaw Paw, K. Prajindra Sankar, Soodabeh Darzi

“…Minimum variance distortionless response (MVDR) beamforming is capable of determining the weight vectors for beam steering; however, its nulling level on the interference sources remains unsatisfactory. Beamforming can be considered as an optimization problem, such that optimal weight vector should be obtained through computation. …”
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A neural dynamics model prediction-based adaptive control system for AUV formation control by Jiwen ZHANG, Bo XU, Chuyan WANG, Zhaoyang WANG

“…Active and inhibitory sources are created to solve the local optimization problem of potential field methods. When paired with optimal control, dynamic obstacle avoidance, formation control, and predicted tracking are accomplished. …”
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Increasing reaming depth enhances implant stability while minimizing bone strain by Monil Karia, Ruben Doyle, Adam Reynolds, Jonathan Jeffers, Justin Cobb

“…Polar gaps were measured using optimal trackers. Results: Compared to a true hemispherical cavity, enhancing the reaming depth significantly increased the primary stability of the implant (p < 0.001) while reducing both the periacetabular strain and strain deterioration for both 1 mm and 2 mm interference fit components. …”
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A Novel Model for Calculating Uplink-Downlink Spectral Efficiency in Cooperative Communication MIMO Systems by Mohammad Reza Pouryeganeh, Azim Fard, Mohammad Bagher Tavakoli

“…Therefore, using the minimum mean-squared-error (MMSE) technique, we have removed the need for optimal elimination of interference between SU and relay service provider or primary user (PU). …”
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Resource Allocation for Two-Way Relay Network Based on Cognitive Radio by Shuang Liang, Shouyi Yang, Wanming Hao

“…The resource allocation issue for sensing-based spectrum opportunistic access and sensing-based spectrum sharing access in two-way relay cognitive network with imperfect spectrum sensing was discussed.Different from the traditional resource allocation methods for two-way relay network,new algorithm jointly considering sensing time and transmission power in secondary system.Under the condition of the sensing time and the transmission power,the maximal throughput of the secondary system can be obtained.To protect the primary user effectively from interference,the average interference power constraint in each hop was considered.The total transmission power constraint of the secondary system is also considered.The proposed algorithms can acquire the optimal sensing time and power allocation under imperfect spectrum sensing for the sensing-based spectrum opportunistic access and sensing-based spectrum sharing access.Finally,the performance of the two schemes was compared and the effectiveness of the proposed algorithm was verified.…”
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Resource Allocation for Two-Way Relay Network Based on Cognitive Radio by Shuang Liang, Shouyi Yang, Wanming Hao

“…The resource allocation issue for sensing-based spectrum opportunistic access and sensing-based spectrum sharing access in two-way relay cognitive network with imperfect spectrum sensing was discussed.Different from the traditional resource allocation methods for two-way relay network,new algorithm jointly considering sensing time and transmission power in secondary system.Under the condition of the sensing time and the transmission power,the maximal throughput of the secondary system can be obtained.To protect the primary user effectively from interference,the average interference power constraint in each hop was considered.The total transmission power constraint of the secondary system is also considered.The proposed algorithms can acquire the optimal sensing time and power allocation under imperfect spectrum sensing for the sensing-based spectrum opportunistic access and sensing-based spectrum sharing access.Finally,the performance of the two schemes was compared and the effectiveness of the proposed algorithm was verified.…”
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Spatio-frequency domain opportunistic access in CR-MIMO system based on primary transmission mode information by Zhao LI, Jian-dong LI, Li-yuan XIAO

“…An opportunistic spatio-frequency access (OSFA) strategy for CR-MIMO system was designed.When spectrum holes exist,cognitive service was implemented applying overlay approach.While there was no idle spectrum available,primary transmission mode information (PTMI) and inter-system interference channel information were exploited.And cognitive service was implemented using underlay approach.The method utilizes both spatial correlation and eigenmode transmission gain in spatial resource quality aluation.Consequently,selection diversity of both authorized channel and cognitive eigenmode was achieved.Moreover,PTMI based signal processing reduced the antenna requirement for cognitive system as well as the power loss of cognitive signal.Simulation results indicate that the proposed method could achieve significant improvement of cognitive service and near-optimal cognitive throughput on the premise that no interference is imposed on the primary.…”
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