Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198153
D. Suh
Mobile multimedia is getting popular. It is expected that 70% of mobile Internet traffic will be video in 2013. Video traffic is so heavy that effective delivery will reduce total amount of Internet traffic as well as your communication fee. This paper argues that cross-layer design will enable the optimal QoE (Quality of Experience) and QoS (Quality of Service) controls for mobile multimedia services.
{"title":"Cross-layer design for mobile multimedia","authors":"D. Suh","doi":"10.1109/WOCC.2012.6198153","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198153","url":null,"abstract":"Mobile multimedia is getting popular. It is expected that 70% of mobile Internet traffic will be video in 2013. Video traffic is so heavy that effective delivery will reduce total amount of Internet traffic as well as your communication fee. This paper argues that cross-layer design will enable the optimal QoE (Quality of Experience) and QoS (Quality of Service) controls for mobile multimedia services.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115248382","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 : 2012-04-19DOI: 10.1109/WOCC.2012.6198152
R. Rojas-Cessa, L. Cai, T. Kijkanjanarat
Memory-access speed continues falling behind the growing speeds of network transmission links. High-speed network links provide a means to connect memory placed in hosts, located in different corners of the network. These hosts are called storage system units (SSUs), where data can be stored. Cloud storage provided with a single server can facilitate large amounts of storage to a user, however, at low access speeds. A distributed approach to cloud storage is an attractive solution. In a distributed cloud, small high-speed memories at SSUs can potentially increase the memory access speed for data processing and transmission. However, the latencies of each SSUs may be different. Therefore, the selection of SSUs impacts the overall memory access speed. This paper proposes a latency-aware scheduling scheme to access data from SSUs. This scheme determines the minimum latency requirement for a given dataset and selects available SSUs with the required latencies. Furthermore, because the latencies of some selected SSUs may be large, the proposed scheme notifies SSUs in advance of the expected time to perform data access. The simulation results show that the proposed scheme achieves faster access speeds than a scheme that randomly selects SSUs and another hat greedily selects SSUs with small latencies.
{"title":"Scheduling memory access on a distributed cloud storage network","authors":"R. Rojas-Cessa, L. Cai, T. Kijkanjanarat","doi":"10.1109/WOCC.2012.6198152","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198152","url":null,"abstract":"Memory-access speed continues falling behind the growing speeds of network transmission links. High-speed network links provide a means to connect memory placed in hosts, located in different corners of the network. These hosts are called storage system units (SSUs), where data can be stored. Cloud storage provided with a single server can facilitate large amounts of storage to a user, however, at low access speeds. A distributed approach to cloud storage is an attractive solution. In a distributed cloud, small high-speed memories at SSUs can potentially increase the memory access speed for data processing and transmission. However, the latencies of each SSUs may be different. Therefore, the selection of SSUs impacts the overall memory access speed. This paper proposes a latency-aware scheduling scheme to access data from SSUs. This scheme determines the minimum latency requirement for a given dataset and selects available SSUs with the required latencies. Furthermore, because the latencies of some selected SSUs may be large, the proposed scheme notifies SSUs in advance of the expected time to perform data access. The simulation results show that the proposed scheme achieves faster access speeds than a scheme that randomly selects SSUs and another hat greedily selects SSUs with small latencies.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126376772","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 : 2012-04-19DOI: 10.1109/WOCC.2012.6198168
B. Patnaik, P. Sahu
A novel 1.28Tbps dense wave length division multiplexing system for free-space optical communication is proposed. The system is a line-of-sight configuration and uses coherent optical quadrature phase shift keying (QPSK) modulation technique. The system consists of 32-channels, with bit-rate of 40-Gbps/channel and adjacent channel spacing of 200GHz. The system is analyzed for various modulation formats; such as return-to-zero, non-return-to-zero and coherent-optical QPSK modulation technique. The performance of the proposed system is analyzed in terms of bit-error-rate, Q-factor, eye opening etc. For an input power level of 10dBm and employing coherent optical QPSK modulation technique, the coverage distance observed is 1360km.
{"title":"Novel QPSK modulation technique for DWDM free space optical communication system","authors":"B. Patnaik, P. Sahu","doi":"10.1109/WOCC.2012.6198168","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198168","url":null,"abstract":"A novel 1.28Tbps dense wave length division multiplexing system for free-space optical communication is proposed. The system is a line-of-sight configuration and uses coherent optical quadrature phase shift keying (QPSK) modulation technique. The system consists of 32-channels, with bit-rate of 40-Gbps/channel and adjacent channel spacing of 200GHz. The system is analyzed for various modulation formats; such as return-to-zero, non-return-to-zero and coherent-optical QPSK modulation technique. The performance of the proposed system is analyzed in terms of bit-error-rate, Q-factor, eye opening etc. For an input power level of 10dBm and employing coherent optical QPSK modulation technique, the coverage distance observed is 1360km.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129402232","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 : 2012-04-19DOI: 10.1109/WOCC.2012.6198163
M. Ramesh, A. Jacob, A. R. Devidas
Disaster responses are severely hindered due to the destruction or non-availability of the communication network. This research work proposes mobile adhoc network architecture integrated with participatory sensing concepts, for reviving the communication network in disaster hit areas. The development of such an architecture requires a new routing methodology to cater to the challenging environment. This paper proposes a design that utilizes the existing the mobile devices such as smartphones, laptops, etc. in the field to provide the required communication facility. The mobile adhoc network architecture proposed is implemented and tested using several android based mobile phones. An android application named Android app for Emergency Communication (AEC) was developed and it enabled users to send messages to emergency services as well as their dear ones even when they are in regions with no cellular coverage.
{"title":"Participatory sensing platform to revive communication network in post-disaster scenario","authors":"M. Ramesh, A. Jacob, A. R. Devidas","doi":"10.1109/WOCC.2012.6198163","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198163","url":null,"abstract":"Disaster responses are severely hindered due to the destruction or non-availability of the communication network. This research work proposes mobile adhoc network architecture integrated with participatory sensing concepts, for reviving the communication network in disaster hit areas. The development of such an architecture requires a new routing methodology to cater to the challenging environment. This paper proposes a design that utilizes the existing the mobile devices such as smartphones, laptops, etc. in the field to provide the required communication facility. The mobile adhoc network architecture proposed is implemented and tested using several android based mobile phones. An android application named Android app for Emergency Communication (AEC) was developed and it enabled users to send messages to emergency services as well as their dear ones even when they are in regions with no cellular coverage.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128254605","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 : 2012-04-19DOI: 10.1109/WOCC.2012.6198181
H. Jau, Tsung-Hsien Lin, Yan-Yu Chen, Chun-Wei Chen, Jui‐Hsiang Liu, A. Fuh
This work proposes two mechanisms for switching the stripes direction of the cholesteric liquid crystal (CLC) gratings. The stripe direction is dependent on the ratio of cell gap to natural pitch length (d/P0) of a CLC sample. Electrical switching is based on the different pitches at the planar state and the transient planar state. The optical switching utilizes the pitch shift by the photo-isomerization effect of the azobenzene doped in a CLC sample. Using the two mechanisms, we can switch the stripe directions in two orthogonal directions. The beam-steering capability of CLC gratings remains effect in both directions.
{"title":"Electrical and optical switchings of the direcitons of cholesteric liquid crystals gratings","authors":"H. Jau, Tsung-Hsien Lin, Yan-Yu Chen, Chun-Wei Chen, Jui‐Hsiang Liu, A. Fuh","doi":"10.1109/WOCC.2012.6198181","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198181","url":null,"abstract":"This work proposes two mechanisms for switching the stripes direction of the cholesteric liquid crystal (CLC) gratings. The stripe direction is dependent on the ratio of cell gap to natural pitch length (d/P0) of a CLC sample. Electrical switching is based on the different pitches at the planar state and the transient planar state. The optical switching utilizes the pitch shift by the photo-isomerization effect of the azobenzene doped in a CLC sample. Using the two mechanisms, we can switch the stripe directions in two orthogonal directions. The beam-steering capability of CLC gratings remains effect in both directions.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128647080","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 : 2012-04-19DOI: 10.1109/WOCC.2012.6198145
Xinying Li, Li Tao, Junwen Zhang, Yuanquan Wang, Yuan Fang, Jiangbo Zhu, Yiguang Wang, Yufeng Shao, N. Chi
μ-law companding and de-companding, which enlarges small signals and compresses large signals, can work successfully in the CO-OFDM transmission system, and μ=1 is the optimal companding coefficient for PAPR reduction.
{"title":"Companding transform for PAPR reduction in coherent optical OFDM system","authors":"Xinying Li, Li Tao, Junwen Zhang, Yuanquan Wang, Yuan Fang, Jiangbo Zhu, Yiguang Wang, Yufeng Shao, N. Chi","doi":"10.1109/WOCC.2012.6198145","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198145","url":null,"abstract":"μ-law companding and de-companding, which enlarges small signals and compresses large signals, can work successfully in the CO-OFDM transmission system, and μ=1 is the optimal companding coefficient for PAPR reduction.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131505844","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 : 2012-04-19DOI: 10.1109/WOCC.2012.6198192
C. Chow, C. Yeh
We discuss the progress and advances in access network, which is considered as the “last-mile” connection between the end-user and the network. Different challenges and possible solutions of access network will be discussed, including the long-reach (LR) passive-optical-network (PON) and the short-reach (SR) wireless fiber-to-the-antenna (FTTA) system. Moreover, orthogonal-frequency-division-multiplexing (OFDM) can provide one more degree of freedom besides the time-division-multiplexing (TDM) and wavelength-division-multiplexing (WDM) for network capacity sharing. And the applications of OFDM in access network will be discussed.
{"title":"Advances in access networks - from long-reach (LR) to short-reach (SR), and from TDM/WDM to OFDM","authors":"C. Chow, C. Yeh","doi":"10.1109/WOCC.2012.6198192","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198192","url":null,"abstract":"We discuss the progress and advances in access network, which is considered as the “last-mile” connection between the end-user and the network. Different challenges and possible solutions of access network will be discussed, including the long-reach (LR) passive-optical-network (PON) and the short-reach (SR) wireless fiber-to-the-antenna (FTTA) system. Moreover, orthogonal-frequency-division-multiplexing (OFDM) can provide one more degree of freedom besides the time-division-multiplexing (TDM) and wavelength-division-multiplexing (WDM) for network capacity sharing. And the applications of OFDM in access network will be discussed.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127102763","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 : 2012-04-19DOI: 10.1109/WOCC.2012.6198143
Dongjie Yin, T. Lee
This paper studies the performance of IEEE 802.15.4 MAC protocol in terms of throughput stability and energy consumption. We modeled it as a multi-queue single-server system and considered the service time distribution of head-of-line packets as a Markov Chain taking into account beacon-enable mode, acknowledgement and unsaturated traffic. We obtain the characteristic equation of network throughput and illustrate the stable throughput region with respect to the retransmission factor. We also show that the energy consumption of each node is kept small within the stable throughput region. The analysis in this paper is verified by simulation results.
{"title":"Throughput stability and energy consumption of IEEE 802.15.4 beacon enabled mode","authors":"Dongjie Yin, T. Lee","doi":"10.1109/WOCC.2012.6198143","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198143","url":null,"abstract":"This paper studies the performance of IEEE 802.15.4 MAC protocol in terms of throughput stability and energy consumption. We modeled it as a multi-queue single-server system and considered the service time distribution of head-of-line packets as a Markov Chain taking into account beacon-enable mode, acknowledgement and unsaturated traffic. We obtain the characteristic equation of network throughput and illustrate the stable throughput region with respect to the retransmission factor. We also show that the energy consumption of each node is kept small within the stable throughput region. The analysis in this paper is verified by simulation results.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130408668","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 : 2012-04-19DOI: 10.1109/WOCC.2012.6198175
Panaya Pengboon, P. Kaewplung
This paper presents an algorithm for the design of the wireless-optical broadband access network (WOBAN) considering the multi-hop wireless connection among subscribers. With our algorithm, we can specify the number of hop in which subscribers can access to optical network units (ONUs) or base stations (BSs). Our algorithm will give the optimum positions, as well as the number, of ONU required in the network, when the number of wireless connection hop is given.Furthermore, the algorithm can also assign for the shortest routes connecting among subscribers. Noted that the placement, the number of ONU, and the routes connecting among subscribers, will vary with the designed number of hop as well as the constraints of wireless connection such as the limitation of signal power.
{"title":"An efficient algorithm for designing multi-hop wireless connections for wireless-optical broadband access network","authors":"Panaya Pengboon, P. Kaewplung","doi":"10.1109/WOCC.2012.6198175","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198175","url":null,"abstract":"This paper presents an algorithm for the design of the wireless-optical broadband access network (WOBAN) considering the multi-hop wireless connection among subscribers. With our algorithm, we can specify the number of hop in which subscribers can access to optical network units (ONUs) or base stations (BSs). Our algorithm will give the optimum positions, as well as the number, of ONU required in the network, when the number of wireless connection hop is given.Furthermore, the algorithm can also assign for the shortest routes connecting among subscribers. Noted that the placement, the number of ONU, and the routes connecting among subscribers, will vary with the designed number of hop as well as the constraints of wireless connection such as the limitation of signal power.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128592083","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 : 2012-04-19DOI: 10.1109/WOCC.2012.6198157
M. Ramesh, A. Sreedevi, K. Kandasamy, P. Rangan
Wireless Sensor Networks are deployed in almost all areas as they are one of the efficient solutions for monitoring, detecting and providing early warnings. Energy minimization being one of the main challenges in WSNs, we present four different topology control algorithms which will compute the aggregated data in a distributed way, addressing this issue. Each algorithm optimizes power to different levels, by reducing the number of computations and transmissions. The discussed methods include two level and multi levels of balanced and progressive network and its analysis of energy savings. Among the four networks, multi-level progressive is found to be better for small number of sensor nodes (N <; 500), at the same time, multi-level balanced proved its efficiency when the number of sensors are large. The comparisons of four networks are discussed for atmost 4000 sensor nodes in a WSN.
{"title":"Energy comparison of balanced and progressive sensor networks","authors":"M. Ramesh, A. Sreedevi, K. Kandasamy, P. Rangan","doi":"10.1109/WOCC.2012.6198157","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198157","url":null,"abstract":"Wireless Sensor Networks are deployed in almost all areas as they are one of the efficient solutions for monitoring, detecting and providing early warnings. Energy minimization being one of the main challenges in WSNs, we present four different topology control algorithms which will compute the aggregated data in a distributed way, addressing this issue. Each algorithm optimizes power to different levels, by reducing the number of computations and transmissions. The discussed methods include two level and multi levels of balanced and progressive network and its analysis of energy savings. Among the four networks, multi-level progressive is found to be better for small number of sensor nodes (N <; 500), at the same time, multi-level balanced proved its efficiency when the number of sensors are large. The comparisons of four networks are discussed for atmost 4000 sensor nodes in a WSN.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115885070","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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