Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388414
T. Kojima, Shuri Fujiwara
One of the most important problems in helicopter satellite communications is the periodic blockage of the received signal caused by rotor blades. Code division multiplexing (CDM) has an implicit time diversity effect overcoming the periodic blockage. Performance of CDM employing Walsh-Hadamard code (WHCDM) under the periodic blockage environment is investigated in this paper. First, we show that a simple WHCDM scheme has the implicit time diversity effect by computer simulation. Next, a WHCDM scheme combined with explicit time diversity is proposed. The proposed scheme improves the bit error rate performance of the conventional time diversity scheme in high speed data transmission.
{"title":"Performance of Walsh-Hadamard code division multiplexing in helicopter satellite communications","authors":"T. Kojima, Shuri Fujiwara","doi":"10.1109/ATC.2015.7388414","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388414","url":null,"abstract":"One of the most important problems in helicopter satellite communications is the periodic blockage of the received signal caused by rotor blades. Code division multiplexing (CDM) has an implicit time diversity effect overcoming the periodic blockage. Performance of CDM employing Walsh-Hadamard code (WHCDM) under the periodic blockage environment is investigated in this paper. First, we show that a simple WHCDM scheme has the implicit time diversity effect by computer simulation. Next, a WHCDM scheme combined with explicit time diversity is proposed. The proposed scheme improves the bit error rate performance of the conventional time diversity scheme in high speed data transmission.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115969291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388302
Thien Huynh-The, O. Baños, Ba-Vui Le, Dinh-Mao Bui, Sungyoung Lee, Yongik Yoon, T. Le-Tien
Interactive activity recognition from the RGB videos still remains a challenge, therefore some existing approaches paid the attention to RGB-Depth video process to avoid problems relating to mutual occlusion and redundant human pose and to improve accuracy of skeleton extraction. From the single action to complex interaction activity, it is necessary an efficient model to describe the relationship of body components between multi-human objects. In this research, the authors proposed a hierarchical model based on the Pachinko Allocation Model for interaction recognition. Concretely, the joint features comprising joint distant and joint motion are calculated from the skeleton position and then support to topic modeling. The probabilistic models describing the flexible relationship between features - poselets - activities are generated by this model. Finally, the Binary Tree of Support Vector Machine is applied for classification. Compared with existing state-of-the-arts, the proposed method outperforms in overall classification accuracy (8-21% approximately) with the SBU Kinect Interaction Dataset.
{"title":"PAM-based flexible generative topic model for 3D interactive activity recognition","authors":"Thien Huynh-The, O. Baños, Ba-Vui Le, Dinh-Mao Bui, Sungyoung Lee, Yongik Yoon, T. Le-Tien","doi":"10.1109/ATC.2015.7388302","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388302","url":null,"abstract":"Interactive activity recognition from the RGB videos still remains a challenge, therefore some existing approaches paid the attention to RGB-Depth video process to avoid problems relating to mutual occlusion and redundant human pose and to improve accuracy of skeleton extraction. From the single action to complex interaction activity, it is necessary an efficient model to describe the relationship of body components between multi-human objects. In this research, the authors proposed a hierarchical model based on the Pachinko Allocation Model for interaction recognition. Concretely, the joint features comprising joint distant and joint motion are calculated from the skeleton position and then support to topic modeling. The probabilistic models describing the flexible relationship between features - poselets - activities are generated by this model. Finally, the Binary Tree of Support Vector Machine is applied for classification. Compared with existing state-of-the-arts, the proposed method outperforms in overall classification accuracy (8-21% approximately) with the SBU Kinect Interaction Dataset.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127992139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388331
Thien Huynh-The, O. Baños, Ba-Vui Le, Dinh-Mao Bui, Sungyoung Lee, Yongik Yoon, T. Le-Tien
An efficient foreground detection algorithm is presented in this work to be robust against consecutively illuminance changes and noise, and adaptive with dynamic speeds of motion in the background. The scene background is firstly modeled by a novel algorithm, namely Neighbor-based Intensity Correction, which identifies and modifies motion pixels extracted from the difference of the background and the current frame. Concretely the first frame is assumed as an initial background to be updated at each new coming frame based on the mechanism of the standard deviation value comparison. Two pixel windows used for standard deviation calculation are generated surrounding a corresponding motion pixel from the background and the current frame. The steadiness of the current background at the pixel-level is measured by a constantly updating factor to decide the usage of the algorithm or not. In the next stage, the foreground of the current frame are detected by the background subtraction scheme with an optimal Otsu threshold. This method is evaluated on various well-known datasets in the object detection and tracking area and then compared with recent approaches via some common quantitative measurements. From experimental results, the proposed method achieves the better results (approximately 5-20%) in term of the foreground detection accuracy.
{"title":"Background subtraction with neighbor-based intensity correction algorithm","authors":"Thien Huynh-The, O. Baños, Ba-Vui Le, Dinh-Mao Bui, Sungyoung Lee, Yongik Yoon, T. Le-Tien","doi":"10.1109/ATC.2015.7388331","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388331","url":null,"abstract":"An efficient foreground detection algorithm is presented in this work to be robust against consecutively illuminance changes and noise, and adaptive with dynamic speeds of motion in the background. The scene background is firstly modeled by a novel algorithm, namely Neighbor-based Intensity Correction, which identifies and modifies motion pixels extracted from the difference of the background and the current frame. Concretely the first frame is assumed as an initial background to be updated at each new coming frame based on the mechanism of the standard deviation value comparison. Two pixel windows used for standard deviation calculation are generated surrounding a corresponding motion pixel from the background and the current frame. The steadiness of the current background at the pixel-level is measured by a constantly updating factor to decide the usage of the algorithm or not. In the next stage, the foreground of the current frame are detected by the background subtraction scheme with an optimal Otsu threshold. This method is evaluated on various well-known datasets in the object detection and tracking area and then compared with recent approaches via some common quantitative measurements. From experimental results, the proposed method achieves the better results (approximately 5-20%) in term of the foreground detection accuracy.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133537725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388341
Duy Tan Faculty, Nguyen Dinh Viet
One of the most important challenges in heterogeneous wireless sensor network (WSN) is to design a routing protocol that use energy efficiently to prolong the lifetime of the entire network due to the limited battery power of sensor nodes. To solve this problem, in this paper, we propose Sector-Chain Based Clustering (SCBC) Routing Protocol, in which, entire network area is divided into sectors (clusters), which balance to the number of nodes. SCBC further reduces energy dissipation of communication in network by constructing chain for each cluster with the chain leader as the cluster head (CH) or secondary cluster head (SCH) that has high residual energy and the shortest distance between candidate nodes and base station (BS) in network. In addition, SCBC improves energy efficiency by calculating the time length of each round in the steady data transmission phase for CHs or SCHs but still guarantee that it is alive in next round. Our simulation results show that the network lifetime of our proposed protocol can be improved about 70% and 20% in comparison with PEGASIS (Power-Efficient Gathering in Sensor Information System) and IEEPB (An Improved Energy-Efficient PEGASIS-Based) protocols, respectively.
在异构无线传感器网络(WSN)中，由于传感器节点的电池电量有限，设计一种有效利用能量的路由协议来延长整个网络的使用寿命是一个重要的挑战。为了解决这一问题，本文提出了基于扇区链的聚类路由协议(SCBC)，该协议将整个网络区域划分为扇区(集群)，每个扇区(集群)与节点数量相平衡。SCBC通过为每个集群构建链，以剩余能量高、候选节点与网络基站之间距离最短的簇头(CH)或次簇头(SCH)作为链头，进一步减少网络中通信的能量耗散。此外，SCBC通过计算CHs或sc在稳定数据传输阶段的每轮时间长度来提高能量效率，但仍然保证它在下一轮中是存活的。仿真结果表明，与PEGASIS (Power-Efficient Gathering in Sensor Information System)和IEEPB (a improved efficient PEGASIS- based)协议相比，该协议的网络生存期分别提高了70%和20%左右。
{"title":"SCBC: Sector-chain based clustering routing protocol for energy efficiency in heterogeneous wireless sensor network","authors":"Duy Tan Faculty, Nguyen Dinh Viet","doi":"10.1109/ATC.2015.7388341","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388341","url":null,"abstract":"One of the most important challenges in heterogeneous wireless sensor network (WSN) is to design a routing protocol that use energy efficiently to prolong the lifetime of the entire network due to the limited battery power of sensor nodes. To solve this problem, in this paper, we propose Sector-Chain Based Clustering (SCBC) Routing Protocol, in which, entire network area is divided into sectors (clusters), which balance to the number of nodes. SCBC further reduces energy dissipation of communication in network by constructing chain for each cluster with the chain leader as the cluster head (CH) or secondary cluster head (SCH) that has high residual energy and the shortest distance between candidate nodes and base station (BS) in network. In addition, SCBC improves energy efficiency by calculating the time length of each round in the steady data transmission phase for CHs or SCHs but still guarantee that it is alive in next round. Our simulation results show that the network lifetime of our proposed protocol can be improved about 70% and 20% in comparison with PEGASIS (Power-Efficient Gathering in Sensor Information System) and IEEPB (An Improved Energy-Efficient PEGASIS-Based) protocols, respectively.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130509077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388395
V. Nguyen-Duy-Nhat, H. Nguyen-Le, Chien Tang-Tan, T. Bui-Thi-Minh
This paper studies the problem of frequency-and time-selective (doubly selective) channel estimation in full-duplex multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. In particular, the maximum-likelihood (ML) principle is employed to formulate a pilot-aided channel estimation algorithm. To reduce the number of doubly selective channel parameters to be estimated, various basis expansion models (BEMs) are used as fitting parametric models. The use of BEMs enables an increase in the system spectral efficiency since estimating a reduced number of channel parameters entails a reduction in used pilot overhead. This paper provides analytical and empirical results of the BEM-based channel estimation accuracy. Several mean square error (MSE) results show that the discrete prolate spheroidal (DPS) or Karhuen Loeve (KL) basis functions would be a suitable choice for BEM-based full-duplex doubly selective channel estimation.
{"title":"Doubly selective channel estimation in full-duplex MIMO-OFDM systems","authors":"V. Nguyen-Duy-Nhat, H. Nguyen-Le, Chien Tang-Tan, T. Bui-Thi-Minh","doi":"10.1109/ATC.2015.7388395","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388395","url":null,"abstract":"This paper studies the problem of frequency-and time-selective (doubly selective) channel estimation in full-duplex multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. In particular, the maximum-likelihood (ML) principle is employed to formulate a pilot-aided channel estimation algorithm. To reduce the number of doubly selective channel parameters to be estimated, various basis expansion models (BEMs) are used as fitting parametric models. The use of BEMs enables an increase in the system spectral efficiency since estimating a reduced number of channel parameters entails a reduction in used pilot overhead. This paper provides analytical and empirical results of the BEM-based channel estimation accuracy. Several mean square error (MSE) results show that the discrete prolate spheroidal (DPS) or Karhuen Loeve (KL) basis functions would be a suitable choice for BEM-based full-duplex doubly selective channel estimation.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132812673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388366
P. Q. Thai, Nguyen Xu Lin, S. Shigeru, Jiang Liu, Zhong Wende
In this paper, a visible light communications (VLC) system prototype using organic light emitting diode (OLED) with dimming support was realized and tested. Frequency response and driving range of OLED were measured and discussed. Considering practical applications of OLED, variable pulse position modulation (VPPM) signal was used to support data transmission under dimming condition. Our prototype was able to transmit up to 85 kbps data rate using an OLED with only 7 kHz 3 dB modulation bandwidth. For the target BER=10-3 with FEC, the luminous flux could be varied within 5-8 lm.
{"title":"Investigation on visible light communication system using OLED with dimming support","authors":"P. Q. Thai, Nguyen Xu Lin, S. Shigeru, Jiang Liu, Zhong Wende","doi":"10.1109/ATC.2015.7388366","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388366","url":null,"abstract":"In this paper, a visible light communications (VLC) system prototype using organic light emitting diode (OLED) with dimming support was realized and tested. Frequency response and driving range of OLED were measured and discussed. Considering practical applications of OLED, variable pulse position modulation (VPPM) signal was used to support data transmission under dimming condition. Our prototype was able to transmit up to 85 kbps data rate using an OLED with only 7 kHz 3 dB modulation bandwidth. For the target BER=10-3 with FEC, the luminous flux could be varied within 5-8 lm.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131873039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388380
Ngo Van Mao, V. Son
Enhancement of Wireless Sensor Networks (WSNs) by improving the network performance has been researched in recent years. This paper presents the application of queuing theory to evaluate performance of WSNs using queuing network models. The analysis of performance parameters consider both kinds of data and routing packets. Moreover, the optimal values of parameters such as service rate and queue length of each sensor node are also investigated under the consideration of lossy WSNs with the coverage of signal transmission and packet loss ratio. The results of the proposed analytical model is compared with the simulation results in various scenarios for validation.
{"title":"Applying queuing theory to evaluate performance of cluster wireless sensor networks","authors":"Ngo Van Mao, V. Son","doi":"10.1109/ATC.2015.7388380","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388380","url":null,"abstract":"Enhancement of Wireless Sensor Networks (WSNs) by improving the network performance has been researched in recent years. This paper presents the application of queuing theory to evaluate performance of WSNs using queuing network models. The analysis of performance parameters consider both kinds of data and routing packets. Moreover, the optimal values of parameters such as service rate and queue length of each sensor node are also investigated under the consideration of lossy WSNs with the coverage of signal transmission and packet loss ratio. The results of the proposed analytical model is compared with the simulation results in various scenarios for validation.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134274811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388416
T. Ho-Phuoc, D. T. Cong
The present paper proposes a new method for color image demosaicing. This method separates luminance from chrominance and allows luminance to be extracted directly from known pixel values. Since interpolation for missing pixels is applied only to chrominance channels, it can reduce artifacts. Moreover, in chrominance channels the proposed method tries to interpolate pixels along edges. As consequence, edges are better preserved in the demosaiced image and false colors, which are a popular problem in demosaicing, are correctly eliminated. Comparisons with other algorithms show satisfying performances of our method in both qualitative and quantitative criteria. Another advantage of the proposed method relates to its low computational complexity, which can facilitate hardware implementation.
{"title":"Compact and efficient algorithm for color demosaicing","authors":"T. Ho-Phuoc, D. T. Cong","doi":"10.1109/ATC.2015.7388416","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388416","url":null,"abstract":"The present paper proposes a new method for color image demosaicing. This method separates luminance from chrominance and allows luminance to be extracted directly from known pixel values. Since interpolation for missing pixels is applied only to chrominance channels, it can reduce artifacts. Moreover, in chrominance channels the proposed method tries to interpolate pixels along edges. As consequence, edges are better preserved in the demosaiced image and false colors, which are a popular problem in demosaicing, are correctly eliminated. Comparisons with other algorithms show satisfying performances of our method in both qualitative and quantitative criteria. Another advantage of the proposed method relates to its low computational complexity, which can facilitate hardware implementation.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"271 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123015805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388392
T. Q. Tho, T. V. Anh, L. M. Phương
Nowadays, there is a rapid development of devices of uninterruptible power supply (UPS) in communications. Inverter is one of the important parts in the UPS and its producing of current harmonics negatively affects the operation quality of communication devices. Therefore, reduction of current harmonics in the UPSs to achieve the stringent standards is one of the priority tasks of the inverters. Increasing the switching frequency of sinusoidal pulse-width modulation (SPWM) of inverters for reduction of current total harmonic distortion (THD) makes switching loss increase. This paper proposes an optimal SPWM technique, with variable switching cycle in every half of the fundamental period, for reducing the current harmonics, without any increase in switching loss. The results of the proposed technique are compared with those of the conventional constant switching cycle technique and the cascaded 5-level inverter to validate the performance of the proposed technique.
{"title":"Optimal modulation to reduce harmonics in inverters","authors":"T. Q. Tho, T. V. Anh, L. M. Phương","doi":"10.1109/ATC.2015.7388392","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388392","url":null,"abstract":"Nowadays, there is a rapid development of devices of uninterruptible power supply (UPS) in communications. Inverter is one of the important parts in the UPS and its producing of current harmonics negatively affects the operation quality of communication devices. Therefore, reduction of current harmonics in the UPSs to achieve the stringent standards is one of the priority tasks of the inverters. Increasing the switching frequency of sinusoidal pulse-width modulation (SPWM) of inverters for reduction of current total harmonic distortion (THD) makes switching loss increase. This paper proposes an optimal SPWM technique, with variable switching cycle in every half of the fundamental period, for reducing the current harmonics, without any increase in switching loss. The results of the proposed technique are compared with those of the conventional constant switching cycle technique and the cascaded 5-level inverter to validate the performance of the proposed technique.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121274438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/ATC.2015.7388351
Wengang Chen, C. Balanis, C. Birtcher
The reflection variation property of Electromagnetic Band-Gap (EBG) structures can be utilized to reduce the Radar Cross Section (RCS) of ground planes. Combining PEC and EBG structures on the same ground plane forms checkerboard surfaces which can achieve a RCS reduction in a narrow frequency band. However, a wider band RCS reduction can be realized by combining two different EBG structures. It can realize 60% frequency bandwidth for the 10-dB RCS reduction. The scattered fields for square checkerboard surfaces are re-directed toward four quadrants, while the scattering for hexagonal checkerboard surfaces are toward six directions. The maxima of the RCS for checkerboard surfaces in the four quadrants are 10 dB less than those of the PEC ground plane, and more than 19 dB RCS reduction is obtained along the principal planes. Both bistatic and monostatic RCS are compared with those of the equal-sized PEC ground planes.
{"title":"Scattering control using square and hexagonal checkerboard surfaces","authors":"Wengang Chen, C. Balanis, C. Birtcher","doi":"10.1109/ATC.2015.7388351","DOIUrl":"https://doi.org/10.1109/ATC.2015.7388351","url":null,"abstract":"The reflection variation property of Electromagnetic Band-Gap (EBG) structures can be utilized to reduce the Radar Cross Section (RCS) of ground planes. Combining PEC and EBG structures on the same ground plane forms checkerboard surfaces which can achieve a RCS reduction in a narrow frequency band. However, a wider band RCS reduction can be realized by combining two different EBG structures. It can realize 60% frequency bandwidth for the 10-dB RCS reduction. The scattered fields for square checkerboard surfaces are re-directed toward four quadrants, while the scattering for hexagonal checkerboard surfaces are toward six directions. The maxima of the RCS for checkerboard surfaces in the four quadrants are 10 dB less than those of the PEC ground plane, and more than 19 dB RCS reduction is obtained along the principal planes. Both bistatic and monostatic RCS are compared with those of the equal-sized PEC ground planes.","PeriodicalId":142783,"journal":{"name":"2015 International Conference on Advanced Technologies for Communications (ATC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116748117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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