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United Algorithm for Dynamic Subcarrier, Bit and Power Allocation in OFDM System

Gao Huanqin,Feng Guangzeng,Zhuqi

Strategic Study of CAE 2006, Volume 8, Issue 3,   Pages 62-65

Abstract:

A realtime united algorithm for dynamic subbcarrier, bit and power allocation according to the change of channel (UA) is presented in this paper, which can be used into the down-link of multi-user orthogonal frequency division multiplexing (OFDM) system. With the algorithm the total transmission power is the minimum while the data rate of each user and the required BER performance can be achieved. Comparing to the subcarrier allocation algorithm (WSA) , the simulation results show that the algorithm presented in this paper has better performance while both have equal calculating complexity.

Keywords： OFDM     Wong's subcarrier allocation (WSA)     UA    

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认知中继三跳网络联合优化 Article

澄 赵,万良 王,信威 姚,双华 杨

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 2,   Pages 253-261 doi: 10.1631/FITEE.1601414

Abstract: 认知中继网络中，传输的吞吐量和传输距离一直是衡量性能的重要指标。现有的研究多数都集中在两跳网络的优化，但其也存在着传输距离不长，只能进行单项传输等缺点。本文提出了一种新的使用认知中继的三跳网络传输方案，通过三阶段的传输过程，实现了次级用户之间的双向传输。同时，引入了叠加编码技术来处理网络中双接收节点的情况。本文将这个三阶段的联合优化问题转化为一个非线性的优化问题，并进行了求解。仿真结果表明，本文提出的优化方法可以在不增加中继跳数的情况下，延长主用户传输距离，并同时提高次级用户的传输吞吐量。

Keywords： 解码转发；三跳；认知中继网络；时间功率分配；叠加编码    

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A Study on Resource Fairness Scheduling Algorithms forthe OFDMA Systems

Zhang Dongmei,Chen Youyun,Cai Yueming

Strategic Study of CAE 2007, Volume 9, Issue 6,   Pages 77-81

Abstract:

The paper studied the radio resource fairness scheduling for Orthogonal Frequency Division Multiplexing Multiple Access (OFDMA) systems which was supporting several different services. After deeply analyzing a classical resource scheduling algorithm,  which maximize the worst user's capacity,  an improved algorithm which can evidently enhance the fairness performance was proposed.  Simulation results show that the improved algorithm can keep a better fairness performance under different application environment,  and can more strictly guarantee the required data rate for different service.

Keywords： OFDMA     radio resource scheduling     sub-carrier allocation     power allocation    

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Supermodular interference suppression game for multistatic MIMO radar networks and multiple jammers with multiple targets Research Article

Bin HE, Hongtao SU,aihebin19@163.com,suht@xidian.edu.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 4,   Pages 617-629 doi: 10.1631/FITEE.2000652

Abstract: To deal with the threat of the new generation of electronic warfare, we establish a non-cooperative countermeasure game model to analyze and interference suppression between multistatic multiple-input multiple-output (MIMO) radars and in this study. First, according to the strategy, a supermodular game framework with a fixed weight (FW) vector is constructed. At the same time, a constrained optimization model for maximizing the radar utility function is established. Based on the utility function, the best strategies for the radars and jammers are obtained. The existence and uniqueness of the Nash equilibrium (NE) of the are proved. A algorithm with FW is proposed which converges to the NE. In addition, we use adaptive methods to suppress cross-channel interference that occurs as direct wave interferences between the radars and jammers. A algorithm for joint and is also proposed. The algorithm can ensure the best , and also improves the interference suppression ability of the . Finally, the effectiveness and convergence of two algorithms are verified by numerical results.

Keywords： Supermodular game     Power allocation     Beamforming     MIMO radar     Multiple jammers    

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Training time minimization for federated edge learning with optimized gradient quantization and bandwidth allocation Research Article

Peixi LIU, Jiamo JIANG, Guangxu ZHU, Lei CHENG, Wei JIANG, Wu LUO, Ying DU, Zhiqin WANG,jiangjiamo@caict.ac.cn,gxzhu@sribd.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 8,   Pages 1247-1263 doi: 10.1631/FITEE.2100538

Abstract: Training a machine learning model with (FEEL) is typically time consuming due to the constrained computation power of edge devices and the limited wireless resources in edge networks. In this study, the problem is investigated in a quantized FEEL system, where heterogeneous edge devices send quantized gradients to the edge server via orthogonal channels. In particular, a stochastic quantization scheme is adopted for compression of uploaded gradients, which can reduce the burden of per-round communication but may come at the cost of increasing the number of communication rounds. The training time is modeled by taking into account the communication time, computation time, and the number of communication rounds. Based on the proposed training time model, the intrinsic trade-off between the number of communication rounds and per-round latency is characterized. Specifically, we analyze the convergence behavior of the quantized FEEL in terms of the optimality gap. Furthermore, a joint data-and-model-driven fitting method is proposed to obtain the exact optimality gap, based on which the closed-form expressions for the number of communication rounds and the total training time are obtained. Constrained by the total bandwidth, the problem is formulated as a joint quantization level and bandwidth allocation optimization problem. To this end, an algorithm based on alternating optimization is proposed, which alternatively solves the subproblem of through successive convex approximation and the subproblem of bandwidth allocation by bisection search. With different learning tasks and models, the validation of our analysis and the near-optimal performance of the proposed optimization algorithm are demonstrated by the simulation results.

Keywords： Federated edge learning     Quantization optimization     Bandwith allocation     Training time minimization    

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Tabu search based resource allocation in radiological examination process execution None

Chun-hua HE

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 3,   Pages 446-458 doi: 10.1631/FITEE.1601802

Abstract: Efficient resource scheduling and allocation in radiological examination process (REP) execution is a key requirement to improve patient throughput and radiological resource utilization and to manage unexpected events that occur when resource scheduling and allocation decisions change due to clinical needs. In this paper, a Tabu search based approach is presented to solve the resource scheduling and allocation problems in REP execution. The primary objective of the approach is to minimize a weighted sum of average examination flow time, average idle time of the resources, and delays. Unexpected events, i.e., emergent or absent examinations, are also considered. For certain parameter combinations, the optimal solution of radiological resource scheduling and allocation is found, while considering the limitations such as routing and resource constraints. Simulations in the application case are performed. Results show that the proposed approach makes efficient use of radiological resource capacity and improves the patient throughput in REP execution.

Keywords： Radiological examination process (REP)     Resource scheduling and allocation     Tabu search    

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Cost-effective resource segmentation in hierarchical mobile edge clouds Special Feature on Future Network-Research Article

Ming-shuang JIN, Shuai GAO, Hong-bin LUO, Hong-ke ZHANG

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 9,   Pages 1209-1220 doi: 10.1631/FITEE.1800203

Abstract: The fifth-generation (5G) network cloudification enables third parties to deploy their applications (e.g., edge caching and edge computing) at the network edge. Many previous works have focused on specific service strategies (e.g., cache placement strategy and vCPU provision strategy) for edge applications from the perspective of a certain third party by maximizing its benefit. However, there is no literature that focuses on how to efficiently allocate resources from the perspective of a mobile network operator, taking the different deployment requirements of all third parties into consideration. In this paper, we address the problem by formulating an optimization problem, which minimizes the total deployment cost of all third parties. To capture the deployment requirements of the third parties, the applications that they want to deploy are classified into two types, namely, computation-intensive ones and storage-intensive ones, whose requirements are considered as input parameters or constraints in the optimization. Due to the NP-hardness and non-convexity of the formulated problem, we have designed an elitist genetic algorithm that converges to the global optimum to solve it. Extensive simulations have been conducted to illustrate the feasibility and effectiveness of the proposed algorithm.

Keywords： Edge clouds     Edge computing     Edge caching     Resource segmentation     Virtual machine (VM) allocation    

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A novel PV sub-module-level power-balancing topology for maximum power point tracking under partial shading and mismatch conditions Article

Mustafa GOKDAG,Mehmet AKBABA

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 12,   Pages 1388-1396 doi: 10.1631/FITEE.1500322

Abstract: Partial shading and mismatch conditions among the series-connected modules/sub-modules suffer from a nonconvex power curve with multiple local maxima and decreased peak power for the whole string. Energy transfer between the sub-modules brings them to the same operating voltage, and this collective operation produces a convex power curve, which results in increased peak power for the string. The proposed topology benefits from the switched-capacitor (SC) converter concept and is an applica-tion for sub-module-level power balancing with some novelties, including stopping the switching in absence of shading, string-level extension, and a reduced number of power electronics components as compared to those in the literature. Reduction in the number of power electronics components is realized by the fact that two sub-modules share one SC converter. This leads to reduced power electronics losses as well as less cost and volume of the converter circuit. Insertion loss analysis of the topology is presented. The proposed topology is simulated in the PSpice environment, and a prototype is built for experimental verification. Both simulation and experimental results confirm the loss analysis. This proves that with the proposed topology it is possible to extract almost all the power available on the partially shaded string and transfer it to the load side.

Keywords： Sub-module-level maximum power point tracking (MPPT)     Differential power processing (DPP)     Distributed power converters     Switched-capacitor (SC) converters    

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Study on Rank Reversals in Liner Allocation Method

Zhang Ling,Zhou Dequn

Strategic Study of CAE 2008, Volume 10, Issue 2,   Pages 50-53

Abstract:

The problem that the liner allocation method can result in rank reversal is poin ted out. The concepts of sorting vectors and their relativity distribute ra tios are proposed to explain the causes of rank reversal. The improved liner al location method named sequence liner allocation method is analyzed to ensure ran k preservation. Finally the conclusion is validated with specific data.

Keywords： decision making     liner allocation method     rank reversal     rank preservation    

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The Realization of Time-Triggered Control Area Network

Lü Weijie,,Liu Luyuan,Wang Yixin

Strategic Study of CAE 2005, Volume 7, Issue 9,   Pages 40-43

Abstract:

The time-triggered architecture for CAN is analyzed. The implementation issue of time- triggered architecture based on 8052 single-chip processor and CAN controller SJA1000 is designed. The maximum number of transmission messages in basic cycle is given. And the scheduling capability is analyzed. The experiment is based on the automotive engine management, the result proves that using time-triggered architecture can not only manage the message transmission but also improve the bandwidth utilization.

Keywords： time-triggered     time synchronization     CANbus     distributed control systems    

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A novel method for extending the output power back-off range of an asymmetrical Doherty power amplifier Research Article

Mingyu LI, Xiaobing CHENG, Zhijiang DAI, Kang ZHONG, Tianfu CAI, Chaoyi HUANG

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 3,   Pages 470-479 doi: 10.1631/FITEE.2200250

Abstract: A novel method is proposed to extend the range of the . This study reveals that the OPBO range of the DPA can be extended by tuning the of the peaking stage away from infinity and changing the phase delay of the output matching network of the carrier power amplifier. Based on this theory, a large-OPBO-range high-efficiency asymmetrical DPA working band from 1.55 to 2.2 GHz (35% relative bandwidth) is designed to verify the proposed method. Experimental results show that the DPA operates from 1.6 to 2.1 GHz. The range of the measured efficiency is 42.2%–52.1% in the OPBO state and 47%–62.7% in the saturation state. The OPBO range is 11.1–13.2 dB.

Keywords： Doherty power amplifier (DPA)     Output power back-off (OPBO)     Output impedance     Network phase    

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Two Ways Pseudo Range Time Synchronization for Navigation Satellite Clock

Tan Shusen

Strategic Study of CAE 2006, Volume 8, Issue 12,   Pages 70-74

Abstract:

Aiming at the demand of time synchronization, the navigation satellite two-way clock pseudo range time synchronization was presented and the application of four basic synchronic ways were analysed in this paper. Comparing with other navigation satellite clock synchronization ways, this way was provided with advantages such as high precision, simplicity and light burden to equipment on satellite and so on. In the first section of the paper the meaning and status of time synchronization of navigation satellite clock were discussed. The error of the navigation satellite clock synchronization affects users' position and precision directly. In the second section two way pseudo range time synchronization theory was introduced, that is to get time error between two stations that is satisfied with the condition △tAB =-tBr-tAr. tAr and tBr are the time of A and B station( or satellite) that receives another station ( or satellite)'s transmitting signal. The difference between them is clock bias. In the third sections pseudo range time synchronization ways introduced. In the fourth, fifth and sixth section of the paper, two way radio pseudo range(TWRPr), two way laser pseudo range(TWLPr) ,two way satellite-relay pseudo range (TWSrPr), and two way earth-relay pseudo range ( TWErP) were analyzed respectively. TWRPr way was provided and RMS = 0.42 ns. TWSrPr three stations time synchronization result was RMS =1.75 ns. In the eighth section the precision that two ways pseudo range time synchronization can reach was summed up, that is TWRPr can reach 1.0 ns. The repeated precision of TWLPr can reach 0.1 ns, and can be used to evaluate the capability of atomic clock and validate the precision of other synchronization method.

Keywords： navigation satellite     pseudo range     time synchronization    

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COVID-19 Vaccine Allocation: Modeling Health Outcomes and Equity Implications of Alternative Strategies Article

Maddalena Ferranna, Daniel Cadarette, David E. Bloom

Engineering 2021, Volume 7, Issue 7,   Pages 924-935 doi: 10.1016/j.eng.2021.03.014

Abstract:

Given the scarcity of safe and effective COVID-19 vaccines, a chief policy question is how to allocate them among different sociodemographic groups. This paper evaluates COVID-19 vaccine prioritization strategies proposed to date, focusing on their stated goals; the mechanisms through which the selected allocations affect the course and burden of the pandemic; and the main epidemiological, economic, logistical, and political issues that arise when setting the prioritization strategy. The paper uses a simple, agestratified susceptible–exposed–infectious–recovered model applied to the United States to quantitatively assess the performance of alternative prioritization strategies with respect to avoided deaths, avoided infections, and life-years gained. We demonstrate that prioritizing essential workers is a viable strategy for reducing the number of cases and years of life lost, while the largest reduction in deaths is achieved by prioritizing older adults in most scenarios, even if the vaccine is effective at blocking viral transmission. Uncertainty regarding this property and potential delays in dose delivery reinforce the call for prioritizing older adults. Additionally, we investigate the strength of the equity motive that would support an allocation strategy attaching absolute priority to essential workers for a vaccine that reduces infectionfatality risk.

Keywords： Vaccine allocation     COVID-19     Equity     SEIR model    

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用于评估共同作者的学术贡献的第一和其他合作者信用分配模式 Article

Li WEIGANG

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 2,   Pages 180-194 doi: 10.1631/FITEE.1600991

Abstract: 共同作者学术贡献分配模式提供了固定或灵活的信用分配公式，并广泛应用于评估科学出版物共同作者的贡献。本文提出了一种新颖的“第一和其他（First and Others, F＆O）合作者”分配模式。通过引入调整参数α和权重β，使得信用分配具备以下新的属性：（1）通过修改公式（调整参数α）或强调单个作者贡献（调整权重β）体现学术贡献分配的灵活性和适用性；（2）将第一作者的贡献与其他作者分开计算，第二作者的贡献会根据文中提出相应定理和证明，揭示了“第一和其他（F＆O）合作者”分配模式新的特性，应是对文献计量学基本理论的贡献。F＆O模式亦可应用于“强调第一作者学术贡献”的策略。

Keywords： 文献计量学；共同作者合作信用；H指数；信息计量；学者信息。    

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A Multi-objective Optimization Decision-making Model for Project Time - resource Tradeoff Problem

Wang Xianjia,Wan Zhongping

Strategic Study of CAE 2005, Volume 7, Issue 2,   Pages 35-40

Abstract:

In the project scheduling and management, the time-resource tradeoff problem is to seek the objective of minimizing the project duration and the total consumed-resources cost under the requirement of the absolute due date of project, and determine an efficient project scheduling according to some precedence relationship and the renewable resource constraints. A new multi-objective optimization decision-making model with time-resource tradeoff problem is proposed, in which objective functions with conflict one another are defined as adaptive and adjustable between the project duration and the total consumed-resources cost in all period. A satisfied feasible solution can be obtained in the solution procedure by compromising and adjusting relationship between the project duration and the total consumed-resource cost. A numerical example is illustrated. In addition, some characteristics on this two-player game are given in the corresponding Lagrangian relaxation form associated with the resource constraints.

Keywords： project scheduling management     time-resource tradeoff     multiobject decision-making model     resource-constrained     project scheduling     Lagragian relaxation    

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Title Author Date Type Operation

United Algorithm for Dynamic Subcarrier, Bit and Power Allocation in OFDM System

Gao Huanqin,Feng Guangzeng,Zhuqi

Journal Article

认知中继三跳网络联合优化

澄 赵,万良 王,信威 姚,双华 杨

Journal Article

A Study on Resource Fairness Scheduling Algorithms forthe OFDMA Systems

Zhang Dongmei,Chen Youyun,Cai Yueming

Journal Article

Supermodular interference suppression game for multistatic MIMO radar networks and multiple jammers with multiple targets

Bin HE, Hongtao SU,aihebin19@163.com,suht@xidian.edu.cn

Journal Article

Training time minimization for federated edge learning with optimized gradient quantization and bandwidth allocation

Peixi LIU, Jiamo JIANG, Guangxu ZHU, Lei CHENG, Wei JIANG, Wu LUO, Ying DU, Zhiqin WANG,jiangjiamo@caict.ac.cn,gxzhu@sribd.cn

Journal Article

Tabu search based resource allocation in radiological examination process execution

Chun-hua HE

Journal Article

Cost-effective resource segmentation in hierarchical mobile edge clouds

Ming-shuang JIN, Shuai GAO, Hong-bin LUO, Hong-ke ZHANG

Journal Article

A novel PV sub-module-level power-balancing topology for maximum power point tracking under partial shading and mismatch conditions

Mustafa GOKDAG,Mehmet AKBABA

Journal Article

Study on Rank Reversals in Liner Allocation Method

Zhang Ling,Zhou Dequn

Journal Article

The Realization of Time-Triggered Control Area Network

Lü Weijie,,Liu Luyuan,Wang Yixin

Journal Article

A novel method for extending the output power back-off range of an asymmetrical Doherty power amplifier

Mingyu LI, Xiaobing CHENG, Zhijiang DAI, Kang ZHONG, Tianfu CAI, Chaoyi HUANG

Journal Article

Two Ways Pseudo Range Time Synchronization for Navigation Satellite Clock

Tan Shusen

Journal Article

COVID-19 Vaccine Allocation: Modeling Health Outcomes and Equity Implications of Alternative Strategies

Maddalena Ferranna, Daniel Cadarette, David E. Bloom

Journal Article

用于评估共同作者的学术贡献的第一和其他合作者信用分配模式

Li WEIGANG

Journal Article

A Multi-objective Optimization Decision-making Model for Project Time - resource Tradeoff Problem

Wang Xianjia,Wan Zhongping

Journal Article