This paper presents an approach to describe dynamic sensor-based applications using a declarative language called WADL. Dynamic sensor-based applications are characterized by the fact that measurement producers (sensors) and consumers are introduced or removed from an execution environment at run-time. Supporting this degree of dynamism is usually done programmatically, and the WADL intends to simplify this task and to provide developers with an explicit view of the system architecture, while supporting its dynamic evolution. The paper describes the WADL, its implementation on top of the OSGi WireAdmin Service, and some experimentation results.
{"title":"An Architecture Description Language for Dynamic Sensor-Based Applications","authors":"H. Cervantes, D. Donsez, Lionel Touseau","doi":"10.1109/CCNC08.2007.40","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.40","url":null,"abstract":"This paper presents an approach to describe dynamic sensor-based applications using a declarative language called WADL. Dynamic sensor-based applications are characterized by the fact that measurement producers (sensors) and consumers are introduced or removed from an execution environment at run-time. Supporting this degree of dynamism is usually done programmatically, and the WADL intends to simplify this task and to provide developers with an explicit view of the system architecture, while supporting its dynamic evolution. The paper describes the WADL, its implementation on top of the OSGi WireAdmin Service, and some experimentation results.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"364 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115273772","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}
This paper introduces a novel peak-to-average power ratio (PAPR) reduction method in orthogonal frequency division multiplexing (OFDM) systems by deploying wavelet packet pre-processing of the quadrature amplitude modulation (QAM) symbols. Specifically, joint inverse discrete wavelet packet and Fourier transformations (IDWPT and IDFT) of QAM symbols are calculated at the transmitter with the purpose of minimizing the PAPR of the OFDM frame to be transmitted. The wavelet packet tree representing a reversible IDWPT chosen at the transmitter is communicated to the receiver as side information, where the output of the DFT block is passed through the DWPT to recover the QAM symbols. As the DWPT is a orthonormal transformation, the proposed method preserves the average transmitted energy while maintaining the integrity of the transmitted information. With a small level of redundancy for side information, the proposed scheme achieves 5.5 dB reduction in PAPR over the traditional OFDM system as measured using the complementary cumulative distribution function (CCDF) of the OFDM signals at the clipping probability of 10-4.
{"title":"PAPR Reduction in OFDM Using Wavelet Packet Pre-Processing","authors":"M. Baro, J. Ilow","doi":"10.1109/CCNC08.2007.50","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.50","url":null,"abstract":"This paper introduces a novel peak-to-average power ratio (PAPR) reduction method in orthogonal frequency division multiplexing (OFDM) systems by deploying wavelet packet pre-processing of the quadrature amplitude modulation (QAM) symbols. Specifically, joint inverse discrete wavelet packet and Fourier transformations (IDWPT and IDFT) of QAM symbols are calculated at the transmitter with the purpose of minimizing the PAPR of the OFDM frame to be transmitted. The wavelet packet tree representing a reversible IDWPT chosen at the transmitter is communicated to the receiver as side information, where the output of the DFT block is passed through the DWPT to recover the QAM symbols. As the DWPT is a orthonormal transformation, the proposed method preserves the average transmitted energy while maintaining the integrity of the transmitted information. With a small level of redundancy for side information, the proposed scheme achieves 5.5 dB reduction in PAPR over the traditional OFDM system as measured using the complementary cumulative distribution function (CCDF) of the OFDM signals at the clipping probability of 10-4.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121196722","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}
This paper proposes a fully distributed architecture to support massively multiplayer games (MMGs) on a peer-to-peer (P2P) overlay network. P2P networks provide a scalable and robust solution for MMGs. Furthermore, similarly to real world interactions, MMG players interact with their surrounding, i.e., with visible players and objects in the virtual world. Thus, self-organization of peers based on their visibility property is essential for efficient overlay network support in MMGs. Also, the overlay network must be re-organized consistently in the face of players' position changes. In this paper, we achieve these goals by designing a peer-to-peer overlay network based on the Voronoi diagram. Each player has a responsibility region that includes nearby objects, and is responsible for updates' dissemination occurring in this region to provide game state consistency among the players who are concerned by the updates. As a proof of concept, we simulated a simple game application to demonstrate the feasibility of our architecture.
{"title":"Data Management in Voronoi-Based P2P Gaming","authors":"Eliya Buyukkaya, M. Abdallah","doi":"10.1109/CCNC08.2007.239","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.239","url":null,"abstract":"This paper proposes a fully distributed architecture to support massively multiplayer games (MMGs) on a peer-to-peer (P2P) overlay network. P2P networks provide a scalable and robust solution for MMGs. Furthermore, similarly to real world interactions, MMG players interact with their surrounding, i.e., with visible players and objects in the virtual world. Thus, self-organization of peers based on their visibility property is essential for efficient overlay network support in MMGs. Also, the overlay network must be re-organized consistently in the face of players' position changes. In this paper, we achieve these goals by designing a peer-to-peer overlay network based on the Voronoi diagram. Each player has a responsibility region that includes nearby objects, and is responsible for updates' dissemination occurring in this region to provide game state consistency among the players who are concerned by the updates. As a proof of concept, we simulated a simple game application to demonstrate the feasibility of our architecture.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121546674","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}
We study OFDM symbol interleaver design for gigabit per second (Gbps) wireless communications over the millimeter-wave (mmWave) frequency band. A bit-reversal symbol interleaver is proposed, which significantly outperforms conventional block interleaver design. It is demonstrated that the new interleaver design can be naturally combined with FFT operation and simplifies the hardware implementation complexity, which is especially important for several Gbps throughput applications. Simple design parameters are also proposed which serve as new and effective metrics for interleaver designs.
{"title":"Symbol Interleaver Design in Gigabit Wireless Communications Systems","authors":"Huaning Niu, Pengfei Xia, Jisung Oh, C. Ngo","doi":"10.1109/CCNC08.2007.171","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.171","url":null,"abstract":"We study OFDM symbol interleaver design for gigabit per second (Gbps) wireless communications over the millimeter-wave (mmWave) frequency band. A bit-reversal symbol interleaver is proposed, which significantly outperforms conventional block interleaver design. It is demonstrated that the new interleaver design can be naturally combined with FFT operation and simplifies the hardware implementation complexity, which is especially important for several Gbps throughput applications. Simple design parameters are also proposed which serve as new and effective metrics for interleaver designs.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121687850","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}
Research into the performance issues of TCP over wireless networks has been the focus of much attention in recent years. Specifically, many homes and offices are now fully equipped with WLAN technologies enabling users and devices to connect to the Internet that predominantly run over TCP for reliable service delivery. It is therefore a common scenario today for TCP segments originating from a TCP server in the Internet to traverse a wireless link in the last-hop portion of the connection on its way to a wireless TCP client. We present an experimental testbed that allows researchers to experiment with real TCP implementations over a real-world last-hop IEEE 802.11 WLAN, capturing the true end-to-end behaviour of TCP connections over an emulated Internet. Also, the results obtained from the testbed allowed us to establish the distribution of 802.11 frame losses in a real-world WLAN, which may be insightful to research in the area of packet-loss control techniques such as erasure control coding. The testbed and our initial results are a step forward in making TCP more robust for future wireless environments.
{"title":"An Experimental Testbed for Evaluating End-to-End TCP Performance Over Wired-to-Wireless Paths","authors":"Ritesh K. Taank, Xiaohong Peng","doi":"10.1109/CCNC08.2007.122","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.122","url":null,"abstract":"Research into the performance issues of TCP over wireless networks has been the focus of much attention in recent years. Specifically, many homes and offices are now fully equipped with WLAN technologies enabling users and devices to connect to the Internet that predominantly run over TCP for reliable service delivery. It is therefore a common scenario today for TCP segments originating from a TCP server in the Internet to traverse a wireless link in the last-hop portion of the connection on its way to a wireless TCP client. We present an experimental testbed that allows researchers to experiment with real TCP implementations over a real-world last-hop IEEE 802.11 WLAN, capturing the true end-to-end behaviour of TCP connections over an emulated Internet. Also, the results obtained from the testbed allowed us to establish the distribution of 802.11 frame losses in a real-world WLAN, which may be insightful to research in the area of packet-loss control techniques such as erasure control coding. The testbed and our initial results are a step forward in making TCP more robust for future wireless environments.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123755066","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}
In MIMO systems, channel estimation is important to distinguish transmit signals from multiple transmit antennas. When MIMO systems are introduced in cellular systems, we have to measure the received power from all the connectable base station (BS), as well as to identify all the channel state information (CSI) for the combination of transmitter and receiver antenna elements. One of the most typical channel estimation schemes for MIMO in a cellular system is to employ a code division multiplexing (CDM) based scheme in which a unique spreading code is assigned to identify both BS and MS antenna elements. However, by increasing the number of transmit antenna elements, a large spreading code and pilot symbols are required to estimate an accurate CSI. To reduce this problem, in this paper, we propose a high time resolution carrier interferometry (HTRCI) for MIMO/OFDM to achieve an accurate CSI without increasing the number of pilot symbols.
{"title":"High Time Resolution Carrier Interferometry for MIMO/OFDM","authors":"C. Ahn","doi":"10.1109/CCNC08.2007.94","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.94","url":null,"abstract":"In MIMO systems, channel estimation is important to distinguish transmit signals from multiple transmit antennas. When MIMO systems are introduced in cellular systems, we have to measure the received power from all the connectable base station (BS), as well as to identify all the channel state information (CSI) for the combination of transmitter and receiver antenna elements. One of the most typical channel estimation schemes for MIMO in a cellular system is to employ a code division multiplexing (CDM) based scheme in which a unique spreading code is assigned to identify both BS and MS antenna elements. However, by increasing the number of transmit antenna elements, a large spreading code and pilot symbols are required to estimate an accurate CSI. To reduce this problem, in this paper, we propose a high time resolution carrier interferometry (HTRCI) for MIMO/OFDM to achieve an accurate CSI without increasing the number of pilot symbols.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125133668","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}
This paper presents a highly secure Wi-Fi infrastructure, in which smart cards are used as EAP client and EAP server, respectively on client's terminal and RADIUS server. Although cheap and secure, this architecture is scalable, because hundreds of EAP smart cards may be deployed on the server side.
{"title":"Open Two-Factor Authentication Tokens, for Emerging Wireless LANs","authors":"P. Urien","doi":"10.1109/CCNC08.2007.293","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.293","url":null,"abstract":"This paper presents a highly secure Wi-Fi infrastructure, in which smart cards are used as EAP client and EAP server, respectively on client's terminal and RADIUS server. Although cheap and secure, this architecture is scalable, because hundreds of EAP smart cards may be deployed on the server side.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124032561","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}
X. Costa, Paolo Favaro, A. Zubow, D. Camps-Mur, J. Aráuz
WiMAX is one of the most promising technologies to provide broadband wireless access in the near future. In this paper we identify a key element for the performance of a WiMAX network, the DL-MAP packing algorithm, which mainly determines the usage efficiency of the available radio resources and investigate potential differences that could appear between WiMAX equipment vendors in the maximum capacity of the system due to the packing approach used. Our results show that the performance of simple DL-MAP packing algorithms might be significantly outperformed by more complex ones resulting in a clear differentiation factor among manufacturers.
{"title":"On the Challenges for the Maximization of Radio Resources Usage in WiMAX Networks","authors":"X. Costa, Paolo Favaro, A. Zubow, D. Camps-Mur, J. Aráuz","doi":"10.1109/CCNC08.2007.208","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.208","url":null,"abstract":"WiMAX is one of the most promising technologies to provide broadband wireless access in the near future. In this paper we identify a key element for the performance of a WiMAX network, the DL-MAP packing algorithm, which mainly determines the usage efficiency of the available radio resources and investigate potential differences that could appear between WiMAX equipment vendors in the maximum capacity of the system due to the packing approach used. Our results show that the performance of simple DL-MAP packing algorithms might be significantly outperformed by more complex ones resulting in a clear differentiation factor among manufacturers.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"92 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122721478","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}
Sangjin Hahm, Changseob Park, Keunsoo Park, Munchurl Kim
Scalable Video Coding (SVC) can be applicable in mobile broadcasting environment due to the flexibility of spatial, temporal and quality scalability. Recently, SVC technology becomes mature rapidly but its reference SW encoder isn't optimized yet. Therefore, we have developed a real-time SW SVC encoder for broadcasting. In this paper, we show our SVC encoder that can provide two spatial layers: QVGA(320 x 240) and VGA(640 x 480). The base layer can be fully compatible with H.264/AVC. Our encoder is performing real-time operation on a normal PC by optimizing SVC algorithm.
可扩展视频编码(Scalable Video Coding, SVC)由于具有空间、时间和质量可扩展性的灵活性，可以应用于移动广播环境。近年来，SVC技术迅速成熟，但其参考SW编码器尚未得到优化。因此，我们开发了一种用于广播的实时SW SVC编码器。在本文中，我们展示了我们的SVC编码器，可以提供两个空间层:QVGA(320 x 240)和VGA(640 x 480)。基础层可以完全兼容H.264/AVC。我们的编码器通过优化SVC算法在普通PC上进行实时操作。
{"title":"Implementation on a Real-Time SVC Encoder for Mobile Broadcasting","authors":"Sangjin Hahm, Changseob Park, Keunsoo Park, Munchurl Kim","doi":"10.1109/CCNC08.2007.285","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.285","url":null,"abstract":"Scalable Video Coding (SVC) can be applicable in mobile broadcasting environment due to the flexibility of spatial, temporal and quality scalability. Recently, SVC technology becomes mature rapidly but its reference SW encoder isn't optimized yet. Therefore, we have developed a real-time SW SVC encoder for broadcasting. In this paper, we show our SVC encoder that can provide two spatial layers: QVGA(320 x 240) and VGA(640 x 480). The base layer can be fully compatible with H.264/AVC. Our encoder is performing real-time operation on a normal PC by optimizing SVC algorithm.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128918218","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}
Orthogonal frequency division multiple access (OFDMA) provides possibilities to exploit diversity of a frequency selective fading channel by appropriate resource scheduling strategies. This paper presents the performance comparison of different strategies with fair allocation of transmission capacity in a typical multiuser scenario. The analyzed performance metrics comprise both throughput and delay, which are required for a comprehensive analysis regarding quality of service (QoS). The evaluation has been conducted by means of stochastic event-driven simulations of a WiMAX based OFDMA system. Therefore, the developed simulation tool provides a detailed implementation of both medium access control (MAC) and physical layer (PHY). The presented results clarify the significant impact of different scheduling strategies on the tradeoff between throughput and delay.
{"title":"Comparison of OFDMA Resource Scheduling Strategies with Fair Allocation of Capacity","authors":"M. Einhaus, O. Klein, B. Walke","doi":"10.1109/CCNC08.2007.97","DOIUrl":"https://doi.org/10.1109/CCNC08.2007.97","url":null,"abstract":"Orthogonal frequency division multiple access (OFDMA) provides possibilities to exploit diversity of a frequency selective fading channel by appropriate resource scheduling strategies. This paper presents the performance comparison of different strategies with fair allocation of transmission capacity in a typical multiuser scenario. The analyzed performance metrics comprise both throughput and delay, which are required for a comprehensive analysis regarding quality of service (QoS). The evaluation has been conducted by means of stochastic event-driven simulations of a WiMAX based OFDMA system. Therefore, the developed simulation tool provides a detailed implementation of both medium access control (MAC) and physical layer (PHY). The presented results clarify the significant impact of different scheduling strategies on the tradeoff between throughput and delay.","PeriodicalId":183858,"journal":{"name":"2008 5th IEEE Consumer Communications and Networking Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129020715","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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