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1. Deep Reinforcement Learning Based Content Caching in Wireless Networks | |||
GAO Huihui,ZHAO Zhongyuan | |||
Electrics, Communication and Autocontrol Technology 22 December 2020 | |||
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Abstract:Content caching is considered as an integral part of content management in wireless networks. In this paper, we studied the Deep Reinforcement Learning (DRL) based content caching scheme in wireless networks. First, an optimization problem that aims to minimize the total cost of content delivery is formulated. Second, a DRL-based algorithm is proposed to implement real time management of content caching and delivery, which can approach the optimal solution without iterations during each decision epoch. Finally, the simulation results are provided to evaluate the performance of our proposed scheme, which show that it can achieve lower cost than the existing content caching schemes. | |||
TO cite this article:GAO Huihui,ZHAO Zhongyuan. Deep Reinforcement Learning Based Content Caching in Wireless Networks[OL].[22 December 2020] http://en.paper.edu.cn/en_releasepaper/content/4753285 |
2. Dynamic and proactive caching in User-centric UDN | |||
Jiang Juzheng | |||
Electrics, Communication and Autocontrol Technology 21 May 2020 | |||
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Abstract:Wireless content caching has been considered as an efficient way to reduce the traffic and energy consumption in 5G networks. As a promising technology of 5G, User-centric UDN(UUDN) break through the traditional cellular architecture, allowing users served by a following AP group(APG) as the user moving. However, caching in UUDN faces fundamental challenges due to the frequent APG refreshing, irregular user moving and APs cooperation inner each APG. In this paper, we propose a dynamic prefetch method to solve the above questions. First, we use a hybrid Markov model to predict the user\'s future position. Then, we propose an algorithm to choose the prefetch point according to both the time dimension and the spatial dimension. In the end, we put forward a specific formula to calculate the size of prefetch content according to different user moving station. In conclusion, we propose an integrate prefetching process in UUDN network solving the problem of when, where and what content to prefetch. Simulation results show that the method we proposed could get a significantly improve than the popular based method and the forward prefetch method. | |||
TO cite this article:Jiang Juzheng. Dynamic and proactive caching in User-centric UDN[OL].[21 May 2020] http://en.paper.edu.cn/en_releasepaper/content/4752130 |
3. 2-D Pair-Matching Method for L-shaped Array Based on CS Theory | |||
YU Xiaoyou,JIANG Yalin | |||
Electrics, Communication and Autocontrol Technology 13 May 2020 | |||
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Abstract:To address the problems of high computational complexity and angle mismatch in 2-D DOA estimation using CS theory in the intelligent vehicle radar communication integrated system, this paper proposes a new method based on compressed sensing. Combined with the particularity of L-shaped array structure, this method firstly uses SVD processing to obtain a low-dimensional data matrix; secondly, defines the spatial synthesis angle for secondary dimensionality reduction; then uses the OMP algorithm and mathematical geometry to inversely obtain sparse parameters; finally, the subspace projection is used to achieve angle matching, so as to obtain the correct 2-D DOA estimation result. The theoretical derivation and experimental simulations show that this algorithm greatly reduces the computational complexity and improves the probability of pairing success. It also has obvious advantages for different SNR, array element number and snapshot number. | |||
TO cite this article:YU Xiaoyou,JIANG Yalin. 2-D Pair-Matching Method for L-shaped Array Based on CS Theory[OL].[13 May 2020] http://en.paper.edu.cn/en_releasepaper/content/4752071 |
4. Research on DOA Estimation Algorithm Based on Sparse Spatial Fusion | |||
YU Xiao-You,JIANG Ya-Lin | |||
Electrics, Communication and Autocontrol Technology 13 May 2020 | |||
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Abstract:The note on the theory of using the compressed sensing theory to estimate the angle of arrival of the array signal in the intelligent vehicle system based on radar-communication is the spatial sparse partitioning and the optimization of the sparse reconstruction algorithm. Different partitioning methods will result in different array flow patterns, and the construction of array flow patterns is the basis of algorithm estimation. At present, the establishment of the sparse model is simply based on the equal angle or the equal sinusoidal division method. However, in the normal and end-fire directions, the orthogonality of the two is different, and the estimation results are also different. To this end, this paper designs a spatial sparse partitioning model combining the equal sinusoidal and the equal angle division. The simulation shows that this model has certain advantages compared with the traditional division method. In addition, in order to optimize the performance of the SAMP algorithm in integrated systems, this paper proposes an improved matching tracking algorithm. Based on the SAMP algorithm, this algorithm sets strict comparison of residual values as termination conditions, and automatically adjusts the number of atoms in the candidate set through an adaptive process to achieve accurate signal reconstruction. The theoretical derivation and experimental simulations show that this algorithm has obvious benifits in terms of operation speed and reconstruction accuracy while maintaining the advantages of this original algorithm. | |||
TO cite this article:YU Xiao-You,JIANG Ya-Lin. Research on DOA Estimation Algorithm Based on Sparse Spatial Fusion[OL].[13 May 2020] http://en.paper.edu.cn/en_releasepaper/content/4751929 |
5. The Outage Behavior of Decode-and-Forward Relaying in Diffusion-Based Molecular Communication | |||
Cui Yanxu,Song Zhengxun,Lang Baihe,Guan Tianfu,Lin Jiaqian | |||
Electrics, Communication and Autocontrol Technology 08 April 2020 | |||
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Abstract:In this paper, the outage behavior of a decode-and-forward (DF) relaying network is studied in a two-hop diffusion-based molecular communication (MC) system. The MC system can be characterized by outage probability and outage events. Based on this event and probability, the robustness of the transmissions to fading is measured. Specifically, according to Shannon\'s capacity theorem and Fick\'s law, the outage probability of fading channels is investigated. The distribution characteristics of the channel gain is considered based on the proposed relaying system. The analysis of this article can be useful for the performance optimization of MC system. | |||
TO cite this article:Cui Yanxu,Song Zhengxun,Lang Baihe, et al. The Outage Behavior of Decode-and-Forward Relaying in Diffusion-Based Molecular Communication[OL].[ 8 April 2020] http://en.paper.edu.cn/en_releasepaper/content/4751511 |
6. A high-precision 3-D indoor positioning system based on artificial bee colony algorithm | |||
CHEN Wenxing,ZHANG Junyi | |||
Electrics, Communication and Autocontrol Technology 11 March 2020 | |||
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Abstract:In this paper, an original three-dimensional (3-D) indoor positioning system based on visible light communication (VLC) applying artificial bee colony (ABC) algorithm is proposed. ABC algorithm is an intelligent optimization algorithm that simulates swarm behavior, which has the advantages of pure principle, fewer control parameters, easy implementation, and strong global optimization ability. In the field of visible light positioning, some positioning systems that realize visible light positioning are based on a two-dimensional (2-D) plane, which is not applicable to actual scenarios. However, the ABC algorithm used in visible light positioning system can easily achieve real three-dimensional positioning with accuracy up to the millimeter level. Simulation results show that the average positioning error can reach about 2.6mm after 40 iterations at 1m height and the simulation considers the edge points. The result of track tracking simulation shows that the average error is 1.7mm and 90.4% of the sampling points have a positioning accuracy below 3.811mm. In addition, the convergence performance simulation shows that the average error can reach 3.8mm within 40 iterations under the SNR of 30dB, and the final average error is stable at 2.6mm. From the results, it turns out that the ABC algorithm is a promising method for indoor visible light localization. | |||
TO cite this article:CHEN Wenxing,ZHANG Junyi. A high-precision 3-D indoor positioning system based on artificial bee colony algorithm[OL].[11 March 2020] http://en.paper.edu.cn/en_releasepaper/content/4751152 |
7. A Modified Sub-cluster Head Stable Clustering Algorithm for Highly Dynamic Unmanned Aerial Vehicles | |||
Guo Yuchen,Zhang Xu | |||
Electrics, Communication and Autocontrol Technology 08 March 2020 | |||
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Abstract:In the UAV network, high-speed movement of nodes will cause frequent network topology updates, making network management more complex and increasing network maintenance overhead. Clustering can increase network capacity, achieve reuse of space resources, and reduce energy consumption overhead. The existing clustering algorithms are proposed for fixed wireless sensor network, mobile ad hoc network with limited mobility or special application such as vehicle network. It is necessary to continue doing the research that could cope with the rapid changes of the network extension caused by the high-speed movement for the UAV.This paper proposes a modified sub-cluster head stable clustering algorithm (SHSC) for highly dynamic unmanned aerial vehicles, which introduces an improved maximum speed similarity parameter when electing a cluster head, so that nodes with similar motion trends are formed the same cluster. The sub-cluster head node is added in each cluster, and becomes a new cluster head immediately when the original cluster head fails or the energy is too low. It is benefit for enhancing the stability of the network. By simulating verification, SHSC is 27% higher than weighted clustering algorithm (WCA) in terms of energy consumption, 22% higher than improved weighted clustering algorithm (IWCA), and 5% higher than optimized stable clustering algorithm (OSCA). In terms of network stability, it is 26% higher than WCA, 22% higher than IWCA, and 19% higher than OSCA. | |||
TO cite this article:Guo Yuchen,Zhang Xu. A Modified Sub-cluster Head Stable Clustering Algorithm for Highly Dynamic Unmanned Aerial Vehicles[OL].[ 8 March 2020] http://en.paper.edu.cn/en_releasepaper/content/4751103 |
8. Accurate ZigBee Wireless Sensor Indoor Localization System Based on PSO Algorithm | |||
ZHENG Ming,LIU Ming-Xin,LI Bei-Ming,XUE Wei | |||
Electrics, Communication and Autocontrol Technology 06 September 2019 | |||
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Abstract:This paper targets to estimate the distance between the blind node whose position is ambiguous in wireless sensor network and the anchor node whose position is known.And then,estimate location of the blind node according to the geometric relationship among nodes in indoor environments. an approach was used to estimate such a distance. The channel propagation model in indoor environments accord with log-normal shadowing model(LNSM),approach used PSO(Particle Swarm Optimization)) algorithm to improve LNSM model and estimates the distance according to improved LNSM and received signal strength indicator(RSSI).Then constructed a equation Based on the geometric relationship among nodes,solved the equation used Swarm intelligence algorithm,got best estimate of blind node' position. the approach achieved a mean absolute error less than 0.5m in a 10×10 Square test site. | |||
TO cite this article:ZHENG Ming,LIU Ming-Xin,LI Bei-Ming, et al. Accurate ZigBee Wireless Sensor Indoor Localization System Based on PSO Algorithm[OL].[ 6 September 2019] http://en.paper.edu.cn/en_releasepaper/content/4749584 |
9. Impact of potential barriers on soliton spectral tunneling in photonic crystal fiber | |||
LUO Yu-Pei,YANG Hua | |||
Electrics, Communication and Autocontrol Technology 15 April 2019 | |||
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Abstract:The paper reports the observation of the potential barriers’ influences on soliton spectral tunneling (SST) in photonics crystal fibers (PCFs) with three zero-dispersion wavelengths (ZDWs). The numerical simulations show that the generation of SST can be controlled well by regulating the parameters of the PCFs. Furthermore, the wave band and location of the switched solitons’ appearance can be controlled by adjusting the position of ZDWs. In addition, the leakage dispersive wave appears during this numerical simulations. This paper illustrate a new understanding of SST, it may provide some inspirations of applications in information security in the near future. | |||
TO cite this article:LUO Yu-Pei,YANG Hua. Impact of potential barriers on soliton spectral tunneling in photonic crystal fiber[OL].[15 April 2019] http://en.paper.edu.cn/en_releasepaper/content/4748462 |
10. All-Optical Format Conversion From PAM4 to QPSK Signal based on HNLF | |||
LI Qiankun,WANG Hongxiang | |||
Electrics, Communication and Autocontrol Technology 19 March 2019 | |||
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Abstract:An optical network intermediate node scheme with format conversion of PAM4-to-QPSK signal is first proposed and simulated numerically. The input PAM4 signal is first converted into the two binary phase-shift keying(BPSK) tributaries based on optical nonlinearity and vector addition. The output quadrature phase-shift keying(QPSK) is generated through vector addition between two BPSK tributaries. One sub-channel BPSK tributary can be extracted from input PAM4 signal directly by using optical nonlinearity and vector superposition. When input PAM4 signal is pre-distorted to be the distorted PAM4 signal by self-phase modulation(SPM), another sub-channel BPSK tributary can be extracted from the distorted PAM4 signal by using optical nonlinearuty and vector superposition. For an input 10 Gb/s PAM4 with optical signal-to noise ratio(OSNR) of 30dB, the output QPSK gets 1.8% decrease in error vector amplitude(EVM), 3 dB receiver OSNR improvement at the bit error rate(BER) of 0.001 because of SPM-based amplitude regeneration. The proposed node scheme can be applied an all-optical interconnection node between different optical networks where different modulation formats are utilized individually. | |||
TO cite this article:LI Qiankun,WANG Hongxiang. All-Optical Format Conversion From PAM4 to QPSK Signal based on HNLF[OL].[19 March 2019] http://en.paper.edu.cn/en_releasepaper/content/4747400 |
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