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Distributed multi-agent Q-learning for joint channel allocation and power control in cognitive radio networks

Journal of Computational information systems 2012年第17期8卷 7071-7078页

作者： Boumediene, Latifa Gao, Zhenguo Liu, Sheng College of Automation Harbin Engineering University Harbin 150001 China Key Laboratory of System Control and Information Processing Ministry of Education Shanghai 200240 China State Key Lab. for Novel Software Technology Nanjing University Nanjing 210093 China

This paper deals with the resource allocation in completely distributed cognitive radio network. We propose a form of real-time multi-agent distributed reinforcement learning, which is known as Q-learning, to allow the cognitive radio to predict its transmit power and channel, in order for achieving a high quality of service without affecting the primary users. Simulation results reveal that the proposed approach is able to significantly reduce the interference to the licensed users while maintaining a high probability of successful transmission in a cognitive radio ad-hoc network. © 2012 Binary information Press.

关键词： Cognitive radio

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Traffic-Demand Dynamic Spectrum Access

Traffic-Demand Dynamic Spectrum Access

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International Conference on Wireless communications, Networking and Mobile Computing (WiCom)

作者： Xianzhong Xie Tong Zhou Xue-Tao Dong Li-Hua He National Defense Key Laboratory of Telecommunication System Information and Control Technology NO.36 Institute of CETC Jiaxing China Institute of personal communication MII Key lab on mobile communication CQUPT Chongqing China

Cognitive radio was deemed to an effective solution to the current shortage of spectrum resources. The most important part of the technique is open spectrum access. A naive spectrum allocation between CR users may lead to significant interference and reduce and reduce the usage of the spectrum. In this paper, we first develop a graph-theoretical model to characterize the different traffic demands between CR users by using interfere graph, on the basis of traditional lab.ling system we propose a Traffic-demand algorithm base on the graph theoretical model, which can support the different traffic demands of CR users that change with time. Experimental results show that when the traffic demands of CR users are limited and change with time, our algorithm can dramatically improve the fairness and produce high efficiency of the spectrum allocation.

关键词： Chromium Traffic control lab.ling Sensor arrays communication system traffic control Interference Resource management Bandwidth Helium Mobile communication

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Twice-Cooperative Spectrum Sensing in Cognitive Radio systems

Twice-Cooperative Spectrum Sensing in Cognitive Radio System...

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International Conference on Wireless communications, Networking and Mobile Computing (WiCom)

作者： Li-Hua He Xianzhong Xie Xue-Tao Dong Tong Zhou Institute of personal communication MII Key lab on mobile communication CQUPT Chongqing China National Defense Key Laboratory of Telecommunication System Information and Control Technology NO.36 Institute of CETC Jiaxing China

The sensing performance of local detection in cognitive radio systems will be degraded when the channel experience fading and shadowing, and hidden terminal problem is inevitable for the primary transmitter-sensing. To overcome this problem, cooperative spectrum sensing has been proposed. We propose a twice-cooperative sensing algorithm to improve the sensing performance. By comparing to the single-cooperative, the simulations show that the proposed algorithm can enhance the sensing performance and the proposed algorithm can also save the band width of the control channel.

关键词： Cognitive radio Fading Degradation Shadow mapping Statistics Wireless sensor networks Probability Helium Mobile communication lab.ratories

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Design and Implementation of an Linkage control system for Stage Visual Effect Equipment

Design and Implementation of an Linkage Control System for S...

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Culture-oriented Science & technology (ICCST), International Conference on

作者： Shilei Bai Yihan Suo Kai Xu Xiujun Tang Jiaxin Zhang School of Information and Communication Engineering Communication University of China Key Laboratory of Acoustic Visual Technology and Intelligent Control System Ministry of Culture and Tourism (Communication University of China) Beijing Key Laboratory of Modern Entertainment Technology (Communication University of China) State Key Laboratory of Media Convergence of Communication Beijing China

ISBN: (数字)9781728181387

ISBN: (纸本)9781728181394

In view of the problems of low equipment integration, difficult equipment operation, and high technical threshold existing in the current stage visual effect linkage control system, a highly integrated linkage control system for stage visual effect equipment, which is suitable for small and medium-sized performance venues, is proposed in this paper. This system can control the stage lighting and the playback of multi-channel and multi-format media content, and it is easy to control. The design scheme of the system is described in detail, and the feasibility of the system is verified through tests in this paper.

关键词： Visual effects Lighting Couplings control systems Libraries Software Process control

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The design of RF front-end chip for typhoon monitoring radiometer

The design of RF front-end chip for typhoon monitoring radio...

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International Conference on communication technology (ICCT)

作者： Zhiming Fang Zhiqun Cheng Tang Liu Jian Zhang Lili Dang Jian Yu Key Lab. of RF Circuit and System Education Ministry Hangzhou Dianzi University Hangzhou China Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Micro-system and Information Technology Shanghai

ISBN: (纸本)9781467370066

The paper presents the design and performance of a V-band radiometer MMIC with 0.1μm GaAs pHEMT technology. The circuit includes a frequency double LO chain and a resistive mixer. The resistive mixer with balance structure topology can improve the image-rejection ratio. Compared with other mixers, the sub-harmonic mixer can achieve high isolation. The typical isolation measured between LO to RF is almost 60dB. The measured conversion loss of the mixer is from 13dB to 15dB over RF frequency 50-60GHz. The bandwidth of IF reaches 1 GHz. The circuit also exhibits very good phase difference between I/Q within 90 ± 6°. The completed mixer show 25dB image-rejection ratio (IRR) over the whole band.

关键词： Radio frequency Frequency measurement PHEMTs Mixers Loss measurement Radiometry

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Nonreciprocal transmission through grating with magneto-optical substrate

Nonreciprocal transmission through grating with magneto-opti...

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Nanophotonics, Nanoelectronics and Nanosensor, N3 2013

作者： Zhu, Haibin Li, Feng Liu, Yajie Jiang, Chun Tang, Bin Zang, Xiaofei College of Mathematics Physics and Information Engineering Jiaxing University Jiaxing 314001 China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai 200240 China School of Mathematics and Physics Changzhou University Changzhou 213164 China Engineering Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai 200093 China

ISBN: (纸本)9781557529763

A double-layer grating structure is proposed, which can show nonreciprocal transmission in near-IR frequency range. The structure is composed of metallic grating with magneto-optical substrate. The nonreciprocity depends on both incidence angle and thickness of the substrate. With proper conditions, the nonreciprocity is as high as 57.6%. © OSA 2013.

关键词： Light transmission

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Association Between Timbre Perception Features and Fine-Grained Emotions in Film and Television Music

Association Between Timbre Perception Features and Fine-Grai...

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Culture-Oriented Science and technology (CoST), International Conference on

作者： Xiaomeng Ren Zhibin Su Wei Jiang Jingyu Liu State Key Laboratory of Media Convergence and Communication (Communication University of China) China Key Laboratory of Acoustic Visual Technology and Intelligent Control System Ministry of Culture and Tourism (Communication University of China) China School of Information and Communication Engineering (Communication University of China) China

ISBN: (数字)9798350380347

ISBN: (纸本)9798350380354

As an integral component of modern cultural works, the role of film and television music in artistic expression and emotional communication has become increasingly significant. Timbre, as a crucial attribute of music, has primarily been studied in terms of the influence of its fundamental objective parameters on coarse-grained emotions. However, there is a lack of in-depth exploration of the association between timbre perception features and fine-grained emotion. Consequently, this paper approaches from the perspective of timbre perception features and fine-grained emotions in film and television music. By conducting perceptual evaluation and subjective emotional annotation experiments, it analyzes the correlation between timbre perception features and fine-grained emotions, confirming that timbre perception features significantly influence musical emotions. Furthermore, a multivariate linear regression model was employed to construct a fine-grained emotion prediction model, which has demonstrated good predictive ability for most musical emotions. This research provides a new perspective on understanding the relationship between timbre and emotion in film and television music, offering a scientific basis for its creation and performance.

关键词： TV Costs Correlation Annotations Linear regression Predictive models Timbre

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Joint Depth Estimation and Semantic Segmentation with Adversarial Multi-task Network

Joint Depth Estimation and Semantic Segmentation with Advers...

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Culture-oriented Science & technology (ICCST), International Conference on

作者： Hui Ren Nan Gao Jia Li State Key Laboratory of Media Convergence of Communication Communication University of China Beijing China Key Laboratory of Acoustic Visual Technology and Intelligent Control System Communication University of China Beijing China School of Information and Communication Engineering Communication University of China Beijing China

ISBN: (数字)9781728181387

ISBN: (纸本)9781728181394

Some exiting works have explored the promotion between depth estimation and semantic segmentation. These works are usually based on convolutional neural networks, which extract compact features and map the relationship between input and output according to specific tasks. In this paper, we introduce a novel adversarial training strategy, that is, generator produces the semantic segmentation map and depth map, and then the discriminator can judge the authenticity of the synthesized color image, thereby supervising the output of the network during back propagation. We use the adversarial loss combined with the reconstruction loss function to supervise the model, and find that the adversarial loss function which is seen as a global supervision can further optimize the output. We use 200 color images from Kitti dataset with semantic segmentation ground truth as the training set, and train the network in an end-to-end manner. The experimental results show that the adversarial training method is well applied to the multi-task training combining semantic segmentation and depth estimation, and can further improve the quantitative performance of depth estimation.

关键词： Semantics Estimation Generative adversarial networks Generators Training Task analysis Mathematical model

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Equivalent Circuit Analysis of the Multi-Sheet-Beam Folded Waveguide Slow-wave Structure

Equivalent Circuit Analysis of the Multi-Sheet-Beam Folded W...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Ma, Yanan Lu, Fengying Zhang, Rui Wang, Yong Chinese Academy of Sciences The Key Lab. of Sci. and Technol. on High Pwr. Microwave Sources and Technol. Aerosp. Info. Res. Inst. China Electrical and Communication Engineering University of Chinese Academy of Sciences The School of Electronic China Southwest China Institute of Electronics Technology Key Laboratory of Avionic Information System Technology Chengdu610036 China

ISBN: (纸本)9798350375909

An equivalent circuit analysis method for the Folded Waveguide (FW) slow-wave structure based on Multi-Sheet-Beam (MSB) is investigated. Folded waveguide is a periodic slow-wave structure made entirely of metal. It is commonly used in travelling wave tubes (TWT) due to its simple coupling structure, robust mechanical design, and excellent heat dissipation capabilities. The MSB-FW slow-wave structure utilizes multiple sheet beams to increase amplification power, reduce single beam current density, shorten the length of the electron beam channel, and improve efficiency. Thus, the MSB-FW slow-wave structure contributes to the performance of the TWT especially in THz *** basic principle and working mechanism of the MSB-FW slow-wave structure are introduced firstly. Previous studies have been more detailed in the analysis of dual-pencil-beam or multi-pencil-beam. However, the analysis of Multi-Sheet-Beam has not yet been fully developed. Therefore, a method based on equivalent circuits to analyze the MSB-FW slow-wave structure is proposed. Based on microwave transmission line theory, the method has converted the MSB-FW slow-wave structure into equivalent microwave networks. Transmission line theory and microwave network analysis techniques are used for modelling and analysis. The equivalent circuit approach is used to analyze dispersion characteristics of MSB-FW slow-wave structure through rational selections of equivalent component parameters and *** results indicate that the dispersion curves obtained from the theoretical results and the simulation results are consistent. This verifies the accuracy and reliability of the equivalent circuit analysis method and lays a foundation for the design of MSB-FW TWT. © 2024 IEEE.

关键词： Slow wave structures

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The analysis of capacity in MIMO channels based on different conditions

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4th International Symposium on Computational Intelligence and Industrial Applications, ISCIIA 2010

作者： Sun, Jiyu Xie, Hong Yang, Mingji College of Information and Communication Engineering Harbin Engineering University Harbin Heilongjiang 150001 China Higher Educ. Key Lab. for Measuring and Contr. Technol. and Instrumentations of Heilongjiang Prov. College of Measurement-Control Tech. and Communications Engineering Harbin University of Science and Technology Harbin Heilongjiang 150040 China

ISBN: (纸本)9787121113154

The analysis and study on MIMO channels capacity is benifit to 4G network's construction and optimization in the future. On the condition of invariable coefficient of channels, MIMO channel capacity and its approximate expression in low SNR was deduced when equal transmit energy scheme was adopted. When waterfilling power algorithm was applied capacacity was also given in detail with CSI at the transmitter. The above two power allocation schemes were compared in the same enviroment by simulation: In the instance of power not being added, waterfilling algorithm is optimal but it is too complex on the operation;If the channel was Rayleigh i.i.d approximatively MIMO channel limit capacity expression was deduced. The tendency of change on ergodic capacity and outage capacity was simulated in various antenna configurations: ergodic capacity and outage capacity improved with rising number of transmit antennas and receive antennas.

关键词： Signal to noise ratio

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