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Towards the Deep Convergence of Communication and Computing in RAN: Scenarios, Architecture, Key Technologies, Challenges and Future Trends 被引量:2
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作者 Nan Li Qi Sun +5 位作者 Xiang Li Fengxian Guo Yuhong Huang Ziqi Chen Yiwei Yan Mugen Peng 《China Communications》 SCIE CSCD 2023年第3期218-235,共18页
To accommodate the diversified emerging use cases in 5G,radio access networks(RAN)is required to be more flexible,open,and versatile.It is evolving towards cloudification,intelligence and openness.By embedding computi... To accommodate the diversified emerging use cases in 5G,radio access networks(RAN)is required to be more flexible,open,and versatile.It is evolving towards cloudification,intelligence and openness.By embedding computing capabilities within RAN,it helps to transform RAN into a natural cost effective radio edge computing platform,offering great opportunity to further enhance RAN agility for diversified services and improve users’quality of experience(Qo E).In this article,a logical architecture enabling deep convergence of communication and computing in RAN is proposed based on O-RAN.The scenarios and potential benefits of sharing RAN computing resources are first analyzed.Then,the requirements,design principles and logical architecture are introduced.Involved key technologies are also discussed,including heterogeneous computing infrastructure,unified computing and communication task modeling,joint communication and computing orchestration and RAN computing data routing.Followed by that,a VR use case is studied to illustrate the superiority of the joint communication and computing optimization.Finally,challenges and future trends are highlighted to provide some insights on the potential future work for researchers in this field. 展开更多
关键词 RAN computing resource sharing com-munication and computing joint design
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Leader-following consensus protocols for formation control of multi-agent network 被引量:10
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作者 Xiaoyuan Luo Nani Han Xinping Guan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第6期991-997,共7页
Two protocols are presented,which can make agents reach consensus while achieving and preserving the desired formation in fixed topology with and without communication timedelay for multi-agent network.First,the proto... Two protocols are presented,which can make agents reach consensus while achieving and preserving the desired formation in fixed topology with and without communication timedelay for multi-agent network.First,the protocol without considering the communication time-delay is presented,and by using Lyapunov stability theory,the sufficient condition of stability for this multi-agent system is presented.Further,considering the communication time-delay,the effectiveness of the protocol based on Lyapunov-Krasovskii function is demonstrated.The main contribution of the proposed protocols is that,as well as the velocity consensus is considered,the formation control is concerned for multi-agent systems described as the second-order equations.Finally,numerical examples are presented to illustrate the effectiveness of the proposed protocols. 展开更多
关键词 CONSENSUS formation control leader-following com-munication time-delay multi-agent systems.
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Second-order consensus in networks of dynamic agents with communication time-delays 被引量:5
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作者 Bo Yang1,2, Huajing Fang3, and Hua Wang4 1. School of Navigation, Wuhan University of Technology, Wuhan 430063, P. R. China 2. Wuhan Second Ship Design and Research Institute, Wuhan 430064, P. R. China +1 位作者 3. Department of Control Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China 4. Department of Aerospace and Mechanical Engineering, Boston University, Boston MA02215, USA 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第1期88-94,共7页
This paper proposes second-order consensus protocols with time-delays and gives the measure of the robustness of the protocols to the time-delay existing in the network of agents with second-order dynamics. By employi... This paper proposes second-order consensus protocols with time-delays and gives the measure of the robustness of the protocols to the time-delay existing in the network of agents with second-order dynamics. By employing a frequency domain method, it is proven that the information states and their time derivatives of all the agents in the network achieve consensus asymptotically, respectively, for appropriate communication timedelay if the topology of weighted network is connected. Particularly, a tight upper bound on the communication time-delay that can be tolerated in the dynamic network is found. The consensus protocols are distributed in the sense that each agent only needs information from its neighboring agents, which reduces the complexity of connections between neighboring agents significantly. Numerical simulation results are provided to demonstrate the effectiveness and the sharpness of the theoretical results for second-order consensus in networks in the presence of communication time-delays. 展开更多
关键词 second-order consensus protocols dynamic networks algebraic graph theory frequency domain analysis com-munication constraints.
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Design and validation of real-time dynamic spectrum management in OFDM-based HNPLC systems 被引量:2
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作者 刘雯静 Guo Jingbo +1 位作者 Yan Yanxin Zhang Tongfei 《High Technology Letters》 EI CAS 2015年第4期379-387,共9页
Time-varying frequency selective attenuation and colored noises are unfavorable characteristics of power line communication(PLC) channels of the low voltage networks.To overcome these disadvantages,a novel real-time d... Time-varying frequency selective attenuation and colored noises are unfavorable characteristics of power line communication(PLC) channels of the low voltage networks.To overcome these disadvantages,a novel real-time dynamic spectrum management(DSM) algorithm in orthogonal frequency division multiplexing(OFDM)-based high-speed narrow-band power line communication(HNPLC) systems is proposed,and the corresponding FPGA circuit is designed and realized.Performance of the proposed DSM is validated with a large amount of network experiments under practical PLC circumstance.As the noise in each narrow subcarrier is approximately Gaussian,the proposed DSM adopts the BER/SER expression formulized via the AWGN channel to provide a handy and universal strategy for power allocation.The real-time requirement is guaranteed by choosing subcarriers in group and employing the same modulation scheme within each transmission.These measures are suitable for any modulation scheme no matter the system criterion is to maximize data rate or minimize power/BER.Algorithm design and hardware implementation of the proposed DSM are given with some flexible and efficient conversions.The DSM circuit is carried out with Xilinx KC705.Simulation and practical experiments validate that the proposed real-time DSM significantly improves system performance. 展开更多
关键词 real-time dynamic spectrum management high-speed narrowband power line com-munication (HNPLC) subcarrier grouping rate adaptive MULTI-CARRIER
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Clustering Approaches for Overhead Reduction over Coordinated Multiple Points Network-MIMO Downlink Systems
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作者 Xiao Shanghui Zhang Zhongpei Shi Zhiping 《China Communications》 SCIE CSCD 2010年第5期103-111,共9页
Owing to the potential for intercell cochannel interference mitigation and significant spectral efficiency improvement, coordinating transmission techniques by multiple radio access points have recently attracted a lo... Owing to the potential for intercell cochannel interference mitigation and significant spectral efficiency improvement, coordinating transmission techniques by multiple radio access points have recently attracted a lot of attention. In this paper, the system structure and mathematical signal model based on clustered structure are presented for multipoint coordinating downlink transmission, the clustered supercell configurations with static/dynamic approaches are discussed, and then optimal precod- ing design is provided for an accepted level of scheduling complexity and reduced signaling over- head. Some simulation results are given to evaluate the performance of different cell-clustering approaches, and to show that a clustered supercell size of 7 is a reasonable choice for clustered coordination with the given transmit power and the reduced feedback. 展开更多
关键词 overhead reduction clustering approa-ches SUPERCELL MIMO ss STEMS cooperative com-munication
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AN ADAPTIVE CDMA RAKE RECEIVER
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作者 薛国强 程时昕 《Journal of Southeast University(English Edition)》 EI CAS 1995年第2期37-43,共7页
A new adaptive RAKE receiver is proposed which uses pilot sig-nal for channel estimation in CDMA down link communications. The configuration of the system is presented and the performance is also evaluated forboth ada... A new adaptive RAKE receiver is proposed which uses pilot sig-nal for channel estimation in CDMA down link communications. The configuration of the system is presented and the performance is also evaluated forboth adaptive RAKE receiver and the non-adapti 展开更多
关键词 RAKE RECEIVER MOBILE COMMUNICATIONS systems CDMA com-munication
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Research of the Wireless Management System for Solar Street Lamp Based on NanoLOC AVR Module
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作者 张开如 莫伦伟 唐梅玉 《Journal of Measurement Science and Instrumentation》 CAS 2011年第1期55-59,共5页
In order to improve the service life of solar street lamp, it is necessary to manage the lamp's battery in the form of on-line detection via wireless communanication. A wireless managonent systean for solar street la... In order to improve the service life of solar street lamp, it is necessary to manage the lamp's battery in the form of on-line detection via wireless communanication. A wireless managonent systean for solar street lamp based on nanoLOC AVR nttlule is researched in this paper, the system can real-timely detect the solar street lamp's battery voltage, corrent, tonperature, internal resistance, residual capacity and so on. And the collected data is transmitted to computer' s management via wireless connnunication to achieve recording, storage, analysis and processing for various parameters. 展开更多
关键词 solar street lamp nanoLOC AVR module wireless com-munication
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Design of Time-Domain Equalizer in Elastic Wave Earth Channel
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作者 吕文红 张福斌 姜平香 《Journal of Measurement Science and Instrumentation》 CAS 2011年第4期353-357,共5页
In low-frequency elastic wave through-the-earth communication system,because of multipath transmission caused by characteristics of the layered earth,the time domain equalizer is different from other wireless communic... In low-frequency elastic wave through-the-earth communication system,because of multipath transmission caused by characteristics of the layered earth,the time domain equalizer is different from other wireless communication systems.A modified LMS algorithm of variable step size is proposed based on improvement of traditional LMS.On the base of principle and simulation analysis,the improved Least Mean Square(LMS)algorithm is analyzed and the performances are compared between the improved LMS algorithm and traditional LMS algorithm.In the improved algorithm,the contradiction between convergence speed and the steady-state error is considered at the same time.Therefore,the improved algorithm has good convergence properties and channel-tracking performance. 展开更多
关键词 Inter-Symbol Interference ISI adaptive equalization stratum channel through-the-earth com-munication system
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Improving microwave brightness temperature predictions based on Bayesian model averaging ensemble approach 被引量:1
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作者 Binghao JIA Zhenghui XIE 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2016年第11期1501-1516,共16页
The choices of the parameterizations for each component in a microwave emission model have significant effects on the quality of brightness temperature (Tb) sim- ulation. How to reduce the uncertainty in the Tb simu... The choices of the parameterizations for each component in a microwave emission model have significant effects on the quality of brightness temperature (Tb) sim- ulation. How to reduce the uncertainty in the Tb simulation is investigated by adopting a statistical post-processing procedure with the Bayesian model averaging (BMA) ensemble approach. The simulations by the community microwave emission model (CMEM) cou- pled with the community land model version 4.5 (CLM4.5) over China's Mainland are con- ducted by the 24 configurations from four vegetation opacity parameterizations (VOPs), three soil dielectric constant parameterizations (SDCPs), and two soil roughness param- eterizations (SRPs). Compared with the simple arithmetical averaging (SAA) method, the BMA reconstructions have a higher spatial correlation coefficient (larger than 0.99) than the C-band satellite observations of the advanced microwave scanning radiometer on the Earth observing system (AMSR-E) at the vertical polarization. Moreover, the BMA product performs the best among the ensemble members for all vegetation classes, with a mean root-mean-square difference (RMSD) of 4 K and a temporal correlation coefficient of 0.64. 展开更多
关键词 Bayesian model averaging (BMA) microwave brightness temperature com-munity microwave emission model (CMEM) community land model version 4.5 (CLM4.5)
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以“科学”的眼光在大众传播领域传播科学
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作者 黄璜 《传媒与教育》 2012年第3期14-17,共4页
科学的传播发展至今,已经超越了传统的科普传播方式,步入了崭新的传播环境下的对话模式中。科学传播必须还科学的本来面目,不仅仅进行科学知识、技能的传播,还有科学方法、科学精神、科学史的传播。大众传媒在科学传播中是除学校之外最... 科学的传播发展至今,已经超越了传统的科普传播方式,步入了崭新的传播环境下的对话模式中。科学传播必须还科学的本来面目,不仅仅进行科学知识、技能的传播,还有科学方法、科学精神、科学史的传播。大众传媒在科学传播中是除学校之外最重要的一级,无论是对科学事件的报道还是日常报道中,科学传播的理念都对普通受众有具体的指导意义,网络媒体在科学传播中更具有时代性的实践意义。 展开更多
关键词 科学传播(science communication) 对话模式(dialogue model) 大众传媒(mass com-munication)
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Short-Term Effects of Experimental Warming and Precipitation Manipulation on Soil Microbial Biomass C and N, Community Substrate Utilization Patterns and Community Composition 被引量:5
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作者 Guanlin LI Seongjun KIM +1 位作者 Minji PARK Yowhan SON 《Pedosphere》 SCIE CAS CSCD 2017年第4期714-724,共11页
Soil microorganisms are major drivers of soil carbon(C) cycling;however,the response of these microorganisms to climate change remains unclear.In the present study,we investigated how 18 months of multifactor climate ... Soil microorganisms are major drivers of soil carbon(C) cycling;however,the response of these microorganisms to climate change remains unclear.In the present study,we investigated how 18 months of multifactor climate treatments(warmed air temperature by 3℃ and decreased or increased precipitation manipulation by 30%) affected soil microbial biomass C and nitrogen(N),community substrate utilization patterns,and community composition.Decreased and increased precipitation significantly reduced microbial biomass C by 13.5% and 24.9% and microbial biomass N by 22.9% and 17.6% in unwarmed plots,respectively(P<0.01).Warming enhanced community substrate utilization by 89.8%,20.4%,and 141.4% in the natural,decreased,and increased precipitation plots,respectively.Particularly,warming significantly enhanced the utilization of amine and carboxylic acid substrates among all precipitation manipulation plots.Compared with the natural air temperature with natural precipitation treatment,other treatments affected fungal community richness by -0.9% to 33.6% and reduced the relative abundance of the dominant bacterial and fungal groups by 0.5% to 6.8% and 4.3% to 10.7%,respectively.The warming and/or precipitation manipulation treatments significantly altered Zygomycota abundance(P<0.05).Our results indicate that climate change drivers and their interactions may cause changes in soil microbial biomass C and N,community substrate utilization patterns,and community composition,particularly for the fungal community,and shifts in the microorganism community may further shape the ecosystems function. 展开更多
关键词 BACTERIAL community CLIMATE change COMMUNITY abundance COMMUNITY diversity COMMUNITY richness FUNGAL com-munity
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