Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274446
F. Jaswar, A. Sha'ameri
Digital modulation based on FSK is widely used in HF data communication. This is due to simplicity in implementation by noncoherent detection and robustness due noise and phase synchronization error. Hardware based design using FPGA can reduced system size. The proposed modulation integrates both the transmitter and receiver modules into a single FPGA. Further reduction in components is achieved by adopting a multiplierless and parallel algorithm at the receiver module. This is proven by comparing with conventional noncoherent detection algorithm.
{"title":"FPGA implementation of CPFSK modulation techniques for HF data communication","authors":"F. Jaswar, A. Sha'ameri","doi":"10.1109/APCC.2003.1274446","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274446","url":null,"abstract":"Digital modulation based on FSK is widely used in HF data communication. This is due to simplicity in implementation by noncoherent detection and robustness due noise and phase synchronization error. Hardware based design using FPGA can reduced system size. The proposed modulation integrates both the transmitter and receiver modules into a single FPGA. Further reduction in components is achieved by adopting a multiplierless and parallel algorithm at the receiver module. This is proven by comparing with conventional noncoherent detection algorithm.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133257146","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 : 2003-09-21DOI: 10.1109/APCC.2003.1274361
H. Persson, J. Karlsson
Future wireless networks, the systems beyond 3G, will be a combination of different wireless systems. With only one terminal a user should be able to connect to different type of operators, technologies and systems. The issue is also to make the terminal staying online connected, when these changes are made. Both intrasystem handovers and intersystem handovers should be supported by such terminals. The systems will form a hierarchical cell structure, that offer the users several technologies and different type of QoS-levels and bandwidths. To analyze this type of hierarchical cell structure a model has been created, and to verify the model calculations on a Markov-chain have been made. Using the transition probabilities we have calculated the state probabilities, to verify the results from the simulations made of our model. The analytical model and the simulation shows a very good agreement. The results show that the model could be used to show how the WLAN usage will behave as the number of WLANs and WLAN users increase.
{"title":"Maintaining QoS by utilizing hierarchical wireless systems","authors":"H. Persson, J. Karlsson","doi":"10.1109/APCC.2003.1274361","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274361","url":null,"abstract":"Future wireless networks, the systems beyond 3G, will be a combination of different wireless systems. With only one terminal a user should be able to connect to different type of operators, technologies and systems. The issue is also to make the terminal staying online connected, when these changes are made. Both intrasystem handovers and intersystem handovers should be supported by such terminals. The systems will form a hierarchical cell structure, that offer the users several technologies and different type of QoS-levels and bandwidths. To analyze this type of hierarchical cell structure a model has been created, and to verify the model calculations on a Markov-chain have been made. Using the transition probabilities we have calculated the state probabilities, to verify the results from the simulations made of our model. The analytical model and the simulation shows a very good agreement. The results show that the model could be used to show how the WLAN usage will behave as the number of WLANs and WLAN users increase.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134380750","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 : 2003-09-21DOI: 10.1109/APCC.2003.1274230
N. Nakaya, Y. Koui, H. Yoshida, S. Seno, N. Okazaki
Due to the recent increase of computer viruses, anti-virus measures for the safety control of networks occupies the important decision. Since general anti-virus measures depend on the countermeasures by individual users, it is difficult for the network managers to manage these viruses. We propose a novel virus extermination method which enables control of anti-virus measures at the manager level, and evaluate the effectiveness of the proposed method by computer simulations. By using this method, the vaccine which has the infection capability that is equal to the viruses spreads the following viruses and exterminate them. Therefore, it is possible to exterminate all viruses if the network manager prepares some computers that detect and exterminate the viruses.
{"title":"Virus extermination by vaccine with pursuit function","authors":"N. Nakaya, Y. Koui, H. Yoshida, S. Seno, N. Okazaki","doi":"10.1109/APCC.2003.1274230","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274230","url":null,"abstract":"Due to the recent increase of computer viruses, anti-virus measures for the safety control of networks occupies the important decision. Since general anti-virus measures depend on the countermeasures by individual users, it is difficult for the network managers to manage these viruses. We propose a novel virus extermination method which enables control of anti-virus measures at the manager level, and evaluate the effectiveness of the proposed method by computer simulations. By using this method, the vaccine which has the infection capability that is equal to the viruses spreads the following viruses and exterminate them. Therefore, it is possible to exterminate all viruses if the network manager prepares some computers that detect and exterminate the viruses.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133383455","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 : 2003-09-21DOI: 10.1109/APCC.2003.1274460
Abdolmohamad Rostami, A. R. Minagar, S. M. Safavi
Multiprotocol label switching integrates the performance and traffic management capabilities of data link layer 2 with the scalability and flexibility of network layer 3 routing. It is applicable to networks using any layer 2 switching, but has particular advantages when applied to ATM networks. It integrates IP routing with ATM switching to offer scalable IP-over-ATM networks. However, supporting quality of service in these switches is an important issue that needs special attention, as it's a necessary requirement for today networks. But as MPLS combines different network technologies, to support quality of service in MPLS switches some other issues like VC merging should be considered too. In this paper, we go over supporting quality of service in MPLS switches and explore the necessary details.
{"title":"Supporting quality of service and VC merging in MPLS switches","authors":"Abdolmohamad Rostami, A. R. Minagar, S. M. Safavi","doi":"10.1109/APCC.2003.1274460","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274460","url":null,"abstract":"Multiprotocol label switching integrates the performance and traffic management capabilities of data link layer 2 with the scalability and flexibility of network layer 3 routing. It is applicable to networks using any layer 2 switching, but has particular advantages when applied to ATM networks. It integrates IP routing with ATM switching to offer scalable IP-over-ATM networks. However, supporting quality of service in these switches is an important issue that needs special attention, as it's a necessary requirement for today networks. But as MPLS combines different network technologies, to support quality of service in MPLS switches some other issues like VC merging should be considered too. In this paper, we go over supporting quality of service in MPLS switches and explore the necessary details.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115848006","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 : 2003-09-21DOI: 10.1109/APCC.2003.1274435
Ruijun Feng, Wen’an Zhou, Ningning Liu, Jianwen Huang, Junde Song
The 3G and beyond wireless communication system will be the integration of many kinds of heterogeneous wireless access networks. These wireless access networks have different layer 2 technologies, so it is very difficult to implement mobility management on link layer in the 3G and beyond system. But the mobility management can be realized on network layer (i.e. IP layer). In this paper the definition of NMM (Network-Layer Mobility Management) is given firstly. Then the framework of NMM for the convergence of the heterogeneous wireless networks is presented, and its structure and function model are given. Also the key technologies used in NMM are introduced. At last a test system for NMM is described.
{"title":"A network-layer mobility management framework for the convergence of heterogeneous wireless networks","authors":"Ruijun Feng, Wen’an Zhou, Ningning Liu, Jianwen Huang, Junde Song","doi":"10.1109/APCC.2003.1274435","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274435","url":null,"abstract":"The 3G and beyond wireless communication system will be the integration of many kinds of heterogeneous wireless access networks. These wireless access networks have different layer 2 technologies, so it is very difficult to implement mobility management on link layer in the 3G and beyond system. But the mobility management can be realized on network layer (i.e. IP layer). In this paper the definition of NMM (Network-Layer Mobility Management) is given firstly. Then the framework of NMM for the convergence of the heterogeneous wireless networks is presented, and its structure and function model are given. Also the key technologies used in NMM are introduced. At last a test system for NMM is described.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124425030","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 : 2003-09-21DOI: 10.1109/APCC.2003.1274479
Sang-Kil Park, Kiyoung Kim, Jong-Su Jang, Bongnam Noh
On 22 October 2002, ICANN, the Internet's main governing body, acknowledged that a massive distributed denial-of-service attack briefly shut down seven of the 13 central Domain Name Services servers that manage Internet traffic worldwide. Prompt action by DNS server operators minimized the duration and impact of the attack, which had little effect on overall Internet performance. Intrusion detection systems are researched and developed to detect attacks from outside world since 1980. Intrusion detection systems create an alert data or log data when detect an intrusion. But Many IDS uses heterogeneous data set, so these data must be mapped to another format. IDWG in IETF proposed IDMEF. This paper designs an alert data format compatible IDMEF. The secure networking framework is consisted of SGS and CPCS. SGS acts as an intrusion detection system on edge of network ingress point, and CPCS acts as a higher-level server. SGS makes an alert data compatible IDMEF and sends it to CPCS. CPCS parses an IDMEF alert data and makes an alert object for using correlation analysis. SGS can see its area only, but CPCS can see wide network area. CPCS can detect more complex attacks as well as support integrated management through cooperating each other. In the view of alert processing we converted raw alert data to Ladon-alert data to support interoperability. We use IDMEF-compatible alert datat structure. We have designed and developed integrated IDS on gateway, and security control server on higher-level class. Then this framework offers cooperative intrusion detection, policy based controlling.
{"title":"Supporting interoperability to heterogeneous IDS in secure networking framework","authors":"Sang-Kil Park, Kiyoung Kim, Jong-Su Jang, Bongnam Noh","doi":"10.1109/APCC.2003.1274479","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274479","url":null,"abstract":"On 22 October 2002, ICANN, the Internet's main governing body, acknowledged that a massive distributed denial-of-service attack briefly shut down seven of the 13 central Domain Name Services servers that manage Internet traffic worldwide. Prompt action by DNS server operators minimized the duration and impact of the attack, which had little effect on overall Internet performance. Intrusion detection systems are researched and developed to detect attacks from outside world since 1980. Intrusion detection systems create an alert data or log data when detect an intrusion. But Many IDS uses heterogeneous data set, so these data must be mapped to another format. IDWG in IETF proposed IDMEF. This paper designs an alert data format compatible IDMEF. The secure networking framework is consisted of SGS and CPCS. SGS acts as an intrusion detection system on edge of network ingress point, and CPCS acts as a higher-level server. SGS makes an alert data compatible IDMEF and sends it to CPCS. CPCS parses an IDMEF alert data and makes an alert object for using correlation analysis. SGS can see its area only, but CPCS can see wide network area. CPCS can detect more complex attacks as well as support integrated management through cooperating each other. In the view of alert processing we converted raw alert data to Ladon-alert data to support interoperability. We use IDMEF-compatible alert datat structure. We have designed and developed integrated IDS on gateway, and security control server on higher-level class. Then this framework offers cooperative intrusion detection, policy based controlling.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134478804","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 : 2003-09-21DOI: 10.1109/APCC.2003.1274467
S. Chaimool, S. Kerdsumang, P. Akkaraekthalin
This paper proposes a new four-pole bandpass filter based on the triangular open-loop resonators structure. The full-wave simulator IE3D has been employed for designing the resonators, and calculating the related coupling coefficients of each resonator pair. The proposed filter circuit has been then finally constructed. It has been found that experimental results of the filter agree very well with simulation expectation. This filter also provides an improved selectivity characteristic with narrow bandwidth and compact size compared with the conventional resonator filters.
{"title":"A novel microstrip bandpass filter using triangular open-loop resonators","authors":"S. Chaimool, S. Kerdsumang, P. Akkaraekthalin","doi":"10.1109/APCC.2003.1274467","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274467","url":null,"abstract":"This paper proposes a new four-pole bandpass filter based on the triangular open-loop resonators structure. The full-wave simulator IE3D has been employed for designing the resonators, and calculating the related coupling coefficients of each resonator pair. The proposed filter circuit has been then finally constructed. It has been found that experimental results of the filter agree very well with simulation expectation. This filter also provides an improved selectivity characteristic with narrow bandwidth and compact size compared with the conventional resonator filters.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131696718","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 : 2003-09-21DOI: 10.1109/APCC.2003.1274410
G. Yoshida, N. Wakamiya, M. Murata, H. Miyahara
In this paper, we introduce active network technologies to a video multicast system that can satisfy heterogeneous client requests in an efficient and effective way We employ active nodes that adapt incoming video streams at the user's request by using transcoders or filters and then dynamically reorganize multicast sessions to accommodate clients. Simulation experiments demonstrate that our methods can appropriately split, merge, and move multicast groups to handle client-to-client heterogeneity.
{"title":"Dynamic organization of active video multicast in heterogeneous environment","authors":"G. Yoshida, N. Wakamiya, M. Murata, H. Miyahara","doi":"10.1109/APCC.2003.1274410","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274410","url":null,"abstract":"In this paper, we introduce active network technologies to a video multicast system that can satisfy heterogeneous client requests in an efficient and effective way We employ active nodes that adapt incoming video streams at the user's request by using transcoders or filters and then dynamically reorganize multicast sessions to accommodate clients. Simulation experiments demonstrate that our methods can appropriately split, merge, and move multicast groups to handle client-to-client heterogeneity.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133634217","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 : 2003-09-21DOI: 10.1109/APCC.2003.1274392
K. Lee
This paper looks into the audio gain line-up of TETRA 800 MHz radios. The focus is on the design of each gain block in both transmit and receive audio paths. It should be noted that the designs described in this paper are implemented based on DIMETRA-P/sup TM/ system requirements and recommendations provided by ETSI. In addition, transducer characterizations were taken into consideration in implementing the audio gain line-up that we see today.
本文研究了TETRA 800mhz无线电的音频增益线。重点是在发送和接收音频路径的每个增益块的设计。需要说明的是，本文所描述的设计是基于dimeta - p /sup TM/系统要求和ETSI提供的建议来实现的。此外，在实现我们今天看到的音频增益阵容时，还考虑了换能器特性。
{"title":"Audio gain setting in TETRA 800 MHz radio","authors":"K. Lee","doi":"10.1109/APCC.2003.1274392","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274392","url":null,"abstract":"This paper looks into the audio gain line-up of TETRA 800 MHz radios. The focus is on the design of each gain block in both transmit and receive audio paths. It should be noted that the designs described in this paper are implemented based on DIMETRA-P/sup TM/ system requirements and recommendations provided by ETSI. In addition, transducer characterizations were taken into consideration in implementing the audio gain line-up that we see today.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132042854","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 : 2003-09-21DOI: 10.1109/APCC.2003.1274335
M. Mas Izyani, A. Asmahanim, M. Romli
A counter-propagating ring-laser cavity technique was demonstrated for gain-clamped and flattened erbium doped fiber amplifier. This technique was achieved by incorporating fiber Bragg grating at center wavelength 1554.88 nm with reflectivity 72.01%. A gain variation was maintained below 1.0 dB with maximum gain 15 dB and noise figure less 7 dB at pump power of 92 mW. Equalization with gain variation less than 2.0 dB can be obtained over a 12 nm wavelength range. A dual stage configuration has an added advantage where it is possible to achieve both high gain and low NF.
{"title":"Flattened dual-stage GC-EDFA using fiber-ring laser technique","authors":"M. Mas Izyani, A. Asmahanim, M. Romli","doi":"10.1109/APCC.2003.1274335","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274335","url":null,"abstract":"A counter-propagating ring-laser cavity technique was demonstrated for gain-clamped and flattened erbium doped fiber amplifier. This technique was achieved by incorporating fiber Bragg grating at center wavelength 1554.88 nm with reflectivity 72.01%. A gain variation was maintained below 1.0 dB with maximum gain 15 dB and noise figure less 7 dB at pump power of 92 mW. Equalization with gain variation less than 2.0 dB can be obtained over a 12 nm wavelength range. A dual stage configuration has an added advantage where it is possible to achieve both high gain and low NF.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"489 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133305235","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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