Pub Date : 2008-12-16DOI: 10.1109/ICCT.2008.4716212
Yun Li, M. Xie
An effective algorithm for number and letter character recognition is proposed in this paper. Our algorithm employs template matching, but it unlike traditional template matching method using the original pixel value to match. Our algorithm draws some features from the original image, and then obtains an eigenvector of 192 dimensions. Before drawing features, the image is disposed using math morphologic algorithm. And then measures the Euclidean distance between the sample vector and the template vector. Then we can obtain the result of recognition. A larger number of experiments prove that this algorithm own high performance and robustness. It can recognize characters which have high similarities, for example, 8, B, R, O and Q. This algorithm also tolerates the slightly tilt of the image. The recognition rate of this algorithm is 99.25%.
{"title":"An effective method for number and letter character recognition","authors":"Yun Li, M. Xie","doi":"10.1109/ICCT.2008.4716212","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716212","url":null,"abstract":"An effective algorithm for number and letter character recognition is proposed in this paper. Our algorithm employs template matching, but it unlike traditional template matching method using the original pixel value to match. Our algorithm draws some features from the original image, and then obtains an eigenvector of 192 dimensions. Before drawing features, the image is disposed using math morphologic algorithm. And then measures the Euclidean distance between the sample vector and the template vector. Then we can obtain the result of recognition. A larger number of experiments prove that this algorithm own high performance and robustness. It can recognize characters which have high similarities, for example, 8, B, R, O and Q. This algorithm also tolerates the slightly tilt of the image. The recognition rate of this algorithm is 99.25%.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121414681","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 : 2008-12-16DOI: 10.1109/ICCT.2008.4716252
Wang Wei-hong, Lin Yu-bing, Chen Tie-ming
Information security on WSN is an open and hot area. Firstly, this paper briefly introduces the structure of WSN operating system TinyOs, the flow of Nesc program and the elliptic curve cryptography library TinyECC. On the basis of TinyOs platform and TinyECC, this paper designs and implements a lightweight node authentication protocol. Finally, this paper analyzes its test result and proves its feasibility.
{"title":"The study and application of elliptic curve cryptography library on wireless sensor network","authors":"Wang Wei-hong, Lin Yu-bing, Chen Tie-ming","doi":"10.1109/ICCT.2008.4716252","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716252","url":null,"abstract":"Information security on WSN is an open and hot area. Firstly, this paper briefly introduces the structure of WSN operating system TinyOs, the flow of Nesc program and the elliptic curve cryptography library TinyECC. On the basis of TinyOs platform and TinyECC, this paper designs and implements a lightweight node authentication protocol. Finally, this paper analyzes its test result and proves its feasibility.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122609902","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 : 2008-12-16DOI: 10.1109/ICCT.2008.4716105
Shou-Chih Lo, Yuan-Yung Hong
In this paper, we propose a novel packet scheduling approach for quality-of-service support in the IEEE 802.16 systems. The proposed approach is a really compromised solution which has good performance on all evaluating aspects of data throughput, packet drop rate, and fairness. We discuss different scheduling strategies for 802.16 systems and propose a new scheduling approach based on both the concepts of weighted fair queuing and earliest deadline first. The simulation results show the superiority of our proposed approach over other ones.
{"title":"A novel QoS scheduling approach for IEEE 802.16 BWA systems","authors":"Shou-Chih Lo, Yuan-Yung Hong","doi":"10.1109/ICCT.2008.4716105","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716105","url":null,"abstract":"In this paper, we propose a novel packet scheduling approach for quality-of-service support in the IEEE 802.16 systems. The proposed approach is a really compromised solution which has good performance on all evaluating aspects of data throughput, packet drop rate, and fairness. We discuss different scheduling strategies for 802.16 systems and propose a new scheduling approach based on both the concepts of weighted fair queuing and earliest deadline first. The simulation results show the superiority of our proposed approach over other ones.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127564200","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 : 2008-12-16DOI: 10.1109/ICCT.2008.4716107
Haipeng Yao, Luyong Zhang, Ran Zhou, Zheng Zhou
In practical cognitive radio networks, the topology is constantly changing since the primary and secondary users join and leave the network at any moment. So it is very important to design a distributed spectrum offering scheme that can coordinate the spectrum offering scheme adapt to dynamic topology with only local information. In this paper, we propose a game-based distributed spectrum offering scheme in cognitive radio network with dynamic topology in which multiple primary users with spectrum opportunity compete with each other to offer spectrum access to the secondary users. We obtain the Nash equilibrium of the game and analyze the impacts of the dynamic topology on the Nash equilibrium. In addition, we present a iterative distributed spectrum offering algorithm for the case when the primary users can not observe the current action and utility adopted by others. We theoretically prove that the algorithm can converge to Nash equilibrium within a few iterative steps. The simulation results show that the proposed scheme can achieve better performances.
{"title":"An efficient game-based competitive spectrum offering scheme in cognitive radio networks with dynamic topology","authors":"Haipeng Yao, Luyong Zhang, Ran Zhou, Zheng Zhou","doi":"10.1109/ICCT.2008.4716107","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716107","url":null,"abstract":"In practical cognitive radio networks, the topology is constantly changing since the primary and secondary users join and leave the network at any moment. So it is very important to design a distributed spectrum offering scheme that can coordinate the spectrum offering scheme adapt to dynamic topology with only local information. In this paper, we propose a game-based distributed spectrum offering scheme in cognitive radio network with dynamic topology in which multiple primary users with spectrum opportunity compete with each other to offer spectrum access to the secondary users. We obtain the Nash equilibrium of the game and analyze the impacts of the dynamic topology on the Nash equilibrium. In addition, we present a iterative distributed spectrum offering algorithm for the case when the primary users can not observe the current action and utility adopted by others. We theoretically prove that the algorithm can converge to Nash equilibrium within a few iterative steps. The simulation results show that the proposed scheme can achieve better performances.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130336155","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 : 2008-12-16DOI: 10.1109/ICCT.2008.4716183
Junping Li, Jie Ma, Shouyin Liu
In this paper, A Recursive Least Squares (RLS) channel estimator with improved decision-directed algorithm (referred as DDA2-RLS) is proposed based on the superimposed training sequence in orthogonal frequency division multiplexing (OFDM) systems. The DDA2-RLS is exploited to further eliminate the interference driven by the superimposed unknown information data. Then, the theoretical analysis for DDA2-RLS algorithm with superimposed training sequence that uses the constant Pseudo-Noise (PN) sequence is given. It is shown that the proposed DDA2-RLS algorithm can improve the channel estimation performance compared with the original RLS and decision-directed algorithm (DDA) RLS algorithms. Simulations results demonstrate the effectiveness of the proposed DDA2-RLS, and the performance is close to the theoretical analysis compared with original RLS and DDA-RLS algorithms.
{"title":"RLS channel estimation with superimposed training sequence in OFDM systems","authors":"Junping Li, Jie Ma, Shouyin Liu","doi":"10.1109/ICCT.2008.4716183","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716183","url":null,"abstract":"In this paper, A Recursive Least Squares (RLS) channel estimator with improved decision-directed algorithm (referred as DDA2-RLS) is proposed based on the superimposed training sequence in orthogonal frequency division multiplexing (OFDM) systems. The DDA2-RLS is exploited to further eliminate the interference driven by the superimposed unknown information data. Then, the theoretical analysis for DDA2-RLS algorithm with superimposed training sequence that uses the constant Pseudo-Noise (PN) sequence is given. It is shown that the proposed DDA2-RLS algorithm can improve the channel estimation performance compared with the original RLS and decision-directed algorithm (DDA) RLS algorithms. Simulations results demonstrate the effectiveness of the proposed DDA2-RLS, and the performance is close to the theoretical analysis compared with original RLS and DDA-RLS algorithms.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124955406","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 : 2008-12-16DOI: 10.1109/ICCT.2008.4716215
Feng Yun-fei, L. Jianping
Symbol mapping is very crucial for the performance of bit-interleaved coded modulation with iterative decoding (BICM-ID). In this paper, a new scheme of symbol mapping called Cross-8PSK-Quasi-Gray is proposed. The optimization scheme of Cross-8PSK is composed of two QPSK with different radius and phases. Through analysis and comparisons with three previously mentioned symbol mappings in terms of channel capacity and error performance, simulation results show that Cross-8PSK-Quasi-Gray mapping significantly outperforms set partitioning, semi set partitioning labeling maps in the aspects of both channel capacity and error performance. The overall performance of Cross-8PSK-Quasi-Gray mapping is nearly close to gray mapping in conventional 8PSK. Thus, Cross-8PSK-Quasi-Gray mapping is a good scheme for designing the power-efficient BICM.
{"title":"Optimized symbol mapping for bit-interleaved coded modulation with iterative decoding","authors":"Feng Yun-fei, L. Jianping","doi":"10.1109/ICCT.2008.4716215","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716215","url":null,"abstract":"Symbol mapping is very crucial for the performance of bit-interleaved coded modulation with iterative decoding (BICM-ID). In this paper, a new scheme of symbol mapping called Cross-8PSK-Quasi-Gray is proposed. The optimization scheme of Cross-8PSK is composed of two QPSK with different radius and phases. Through analysis and comparisons with three previously mentioned symbol mappings in terms of channel capacity and error performance, simulation results show that Cross-8PSK-Quasi-Gray mapping significantly outperforms set partitioning, semi set partitioning labeling maps in the aspects of both channel capacity and error performance. The overall performance of Cross-8PSK-Quasi-Gray mapping is nearly close to gray mapping in conventional 8PSK. Thus, Cross-8PSK-Quasi-Gray mapping is a good scheme for designing the power-efficient BICM.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"2022 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131729674","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 : 2008-12-16DOI: 10.1109/ICCT.2008.4716269
C. Pomsuwan, P. Phadungkul
This paper presents the automatic optical power and extinction ratio control of 4.25 Gbps optical transceiver to optimize optical transmitting eye diagrams over operating temperature range. Optical eye diagrams are adjusted an optical power and extinction ratio over temperature following to quadratic equation and linear equation respectively which are calculated from the fitting curves of optical power and extinction ratio acquisition as the optical eye diagrams are optimized. The optimized eye diagrams are considered by zero hit mask margin test compliant with Fibre Channel standards.
{"title":"Notice of RetractionAutomatic optical power and extinction ratio control of 4.25Gbps optical transceiver","authors":"C. Pomsuwan, P. Phadungkul","doi":"10.1109/ICCT.2008.4716269","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716269","url":null,"abstract":"This paper presents the automatic optical power and extinction ratio control of 4.25 Gbps optical transceiver to optimize optical transmitting eye diagrams over operating temperature range. Optical eye diagrams are adjusted an optical power and extinction ratio over temperature following to quadratic equation and linear equation respectively which are calculated from the fitting curves of optical power and extinction ratio acquisition as the optical eye diagrams are optimized. The optimized eye diagrams are considered by zero hit mask margin test compliant with Fibre Channel standards.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129078273","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 : 2008-12-16DOI: 10.1109/ICCT.2008.4716256
Xiaohui Hu, Ji-zhong Shen
Much attention has been paid to dynamic circuit in current low power design. Since the BiCMOS circuit has advantages of both the CMOS circuit and the TTL circuit, it has gained more and more application. In this paper, a new structure and the design method at switch level of the binary dynamic BiCMOS circuit has been proposed based on an n-type BiCMOS dynamic circuit. The circuits designed following this method have shown advantages not only in heavy integration density, low power, high speed and large load drive capability, but also in simple structure and low design complexity. PSpice simulation has proved that these circuits have correct logic function, high running speed and low power consumption.
{"title":"The structure of dynamic BiCMOS circuit and its switch-level design","authors":"Xiaohui Hu, Ji-zhong Shen","doi":"10.1109/ICCT.2008.4716256","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716256","url":null,"abstract":"Much attention has been paid to dynamic circuit in current low power design. Since the BiCMOS circuit has advantages of both the CMOS circuit and the TTL circuit, it has gained more and more application. In this paper, a new structure and the design method at switch level of the binary dynamic BiCMOS circuit has been proposed based on an n-type BiCMOS dynamic circuit. The circuits designed following this method have shown advantages not only in heavy integration density, low power, high speed and large load drive capability, but also in simple structure and low design complexity. PSpice simulation has proved that these circuits have correct logic function, high running speed and low power consumption.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134314180","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 : 2008-12-16DOI: 10.1109/ICCT.2008.4716281
Lv Qingfei, Liu Gang
An improved laser-controlled land leveling system is discussed with the purpose of designing the system effectively and low-cost. The system is composed of three parts. A laser emitter can produce slopes. A laser receiver can receive the laser beam and filter the noisy light, and its incepting diameter is extended to about 400 m. A controller can process the altitude signals and control the hydraulic system for the leveling scraper. Many experiments have been done in different places, and the standard deviation of relative height is close to 2 cm after leveling. Experiments have shown that the system is effective and steady, and the cost is obviously decreased.
{"title":"Research on an improved laser-controlled land leveling system","authors":"Lv Qingfei, Liu Gang","doi":"10.1109/ICCT.2008.4716281","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716281","url":null,"abstract":"An improved laser-controlled land leveling system is discussed with the purpose of designing the system effectively and low-cost. The system is composed of three parts. A laser emitter can produce slopes. A laser receiver can receive the laser beam and filter the noisy light, and its incepting diameter is extended to about 400 m. A controller can process the altitude signals and control the hydraulic system for the leveling scraper. Many experiments have been done in different places, and the standard deviation of relative height is close to 2 cm after leveling. Experiments have shown that the system is effective and steady, and the cost is obviously decreased.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132194003","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 : 2008-12-16DOI: 10.1109/ICCT.2008.4716287
Shunlan Liu, Jian-Hong Hu, M. Dai
In this work, we present two new blind equalization schemes suitable for transmitting cross cross-QAM signals. Based on the framework of constant cross algorithm (CXA), a modified CXA (MCXA) is obtained by adding a constellation-matched error (CME) term to the cost function of the CXA. For the MCXA, the CXA term provides global convergence and the CME term helps to decrease the residual error and accelerate convergence. Furthermore, we propose a decision-directed version of the MCXA, called DD-MCXA, which can improves the performance of the MCXA. Preserving the good initial convergence characteristics of the CXA, the DD-MCXA automatically decreases the effect of the CXA errors when the equalizer is near convergence. Both simulation and analysis demonstrate the good performance of the proposed schemes.
{"title":"New blind equalization schemes based on constant cross algorithm","authors":"Shunlan Liu, Jian-Hong Hu, M. Dai","doi":"10.1109/ICCT.2008.4716287","DOIUrl":"https://doi.org/10.1109/ICCT.2008.4716287","url":null,"abstract":"In this work, we present two new blind equalization schemes suitable for transmitting cross cross-QAM signals. Based on the framework of constant cross algorithm (CXA), a modified CXA (MCXA) is obtained by adding a constellation-matched error (CME) term to the cost function of the CXA. For the MCXA, the CXA term provides global convergence and the CME term helps to decrease the residual error and accelerate convergence. Furthermore, we propose a decision-directed version of the MCXA, called DD-MCXA, which can improves the performance of the MCXA. Preserving the good initial convergence characteristics of the CXA, the DD-MCXA automatically decreases the effect of the CXA errors when the equalizer is near convergence. Both simulation and analysis demonstrate the good performance of the proposed schemes.","PeriodicalId":259577,"journal":{"name":"2008 11th IEEE International Conference on Communication Technology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133533075","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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