2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011)最新文献_第5页

Energy-efficient transmission of DWT image over OFDM fading channel OFDM衰落信道上DWT图像的节能传输

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716514

Ashwani Sharma, S. De, H. Gupta

{"title":"Energy-efficient transmission of DWT image over OFDM fading channel","authors":"Ashwani Sharma, S. De, H. Gupta","doi":"10.1109/COMSNETS.2011.5716514","DOIUrl":"https://doi.org/10.1109/COMSNETS.2011.5716514","url":null,"abstract":"In many applications retransmission of lost packets are not permitted. In an OFDM system, due to channel fading, only a subset of carriers are usable for successful data transmission. If the channel state information is available at the transmitter, it is possible to take a proactive decision of mapping the descriptions optimally onto the good subcarriers and discard at the transmitter itself the remaining descriptions, which would have been otherwise dropped at the receiver due to unacceptably high channel errors. In this paper we present a energy saving approach to transmission of discrete wavelet transformation based compressed image frames over the OFDM channels. Based on one-bit channel state information at the transmitter, the descriptions in order of descending priority are assigned to the currently good channels. In order to reduce the system power consumption, the mapped descriptions onto the bad subchannels are dropped at the transmitter. Via analysis, supported by MATLAB simulations, we demonstrate the usefulness of our proposed scheme in terms of system energy saving without compromising the received quality in terms of peak signal-noise ratio.","PeriodicalId":302678,"journal":{"name":"2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116986166","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}

引用次数: 15

Voice messaging for mobile delay-tolerant networks 用于移动容忍延迟网络的语音信息

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716412

M. Islam, Anssi Turkulainen, J. Ott

引用次数: 4

Energy efficient resource allocation in mobile ad hoc computational grids 移动自组织计算网格中的能源高效资源分配

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716409

Sayed Chhattan Shah, Myong-Soon Park

{"title":"Energy efficient resource allocation in mobile ad hoc computational grids","authors":"Sayed Chhattan Shah, Myong-Soon Park","doi":"10.1109/COMSNETS.2011.5716409","DOIUrl":"https://doi.org/10.1109/COMSNETS.2011.5716409","url":null,"abstract":"This paper addresses the problem of energy efficient resource allocation to interdependent tasks in mobile ad hoc computational grids. The interdependent tasks may exchange large quantity of data and consume the energy proportional to amount of data exchanged among the tasks. If tasks wouldn't be allocated effectively, then there can be a significant increase in the energy consumption and communication cost. The increased energy consumption limit the life time of a node and may result in a power failure which not only affects the task executing on a node but also affects other tasks in various ways. In addition, the mobile nodes within a grid are battery driven and thus have a limited power that should be utilized effectively. In this paper, we propose a hybrid power-based resource allocation scheme to reduce the energy consumption and communication cost among the interdependent tasks. The basic idea is to exploit the dependency and task types and allocate interdependent tasks to nodes accessible at a minimum transmission power level. We also propose a power-based algorithm to find a group of closest nodes to allocate a set of interdependent tasks. Compared to the traditional algorithms, the complexity of proposed algorithm depends on the number of transmission power levels rather than the number of nodes within a grid.","PeriodicalId":302678,"journal":{"name":"2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122606463","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}

引用次数: 3

MESA: Farsighted flow management for video delivery in broadband wireless networks MESA:宽带无线网络中视频传输的前瞻性流量管理

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716480

R. Mahindra, Ravi Kokku, Honghai Zhang, S. Rangarajan

引用次数: 3

Processing interference at the physical layer to enhance information flow in wireless networks 在物理层处理干扰，增强无线网络中的信息流

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716493

B. Muthuramalingam, S. Bhashyam, A. Thangaraj

引用次数: 4

An electronic travel aid for navigation of visually impaired persons 为视障人士提供的电子导航设备

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716517

Amit Kumar, R. Patra, M. Manjunatha, J. Mukhopadhyay, A. Majumdar

引用次数: 75

Flexible playout adaptation for low delay AAC RTP communication 灵活的播放适应低延迟AAC RTP通信

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716414

J. Issing, Stefan Reuschl, F. Dressler, Nikolaus Färber

{"title":"Flexible playout adaptation for low delay AAC RTP communication","authors":"J. Issing, Stefan Reuschl, F. Dressler, Nikolaus Färber","doi":"10.1109/COMSNETS.2011.5716414","DOIUrl":"https://doi.org/10.1109/COMSNETS.2011.5716414","url":null,"abstract":"We present an integrated approach for flexible playout adaptation for high quality audio transmission over impaired network connections. The key concept of our framework is a continuous measurement of the transmission delay, the delay variation, and packet loss. Based on these measurements, the adaptive playout control employs audio time stretching using audio concealment and frame dropping techniques to keep the low delay requirements. In the literature, playout adaptation techniques have mainly been considered for voice over IP, using silence periods between talkspurts, or for high quality audio transmission over dedicated network links. To the best of our knowledge, our playout algorithm is the first achieving low delay high quality audio streaming over impaired network connections for both music and speech. We used a significant number of network traces to estimate the variation of the network quality in DSL, WLAN, UMTS and GPRS links and to update the parameters of our playout adaptation technique. Experimental results clearly indicate that our system provides very high accuracy for the desired accepted late loss rate and achieves a fast playout adaptation, even for rapidly changing network conditions.","PeriodicalId":302678,"journal":{"name":"2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117225217","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}

引用次数: 3

Multimedia communication in cognitive radio networks based on sample division multiplexing 基于样本分复用的认知无线网络多媒体通信

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716435

Ansuman Bhattacharya, Rabindranath Ghosh, K. Sinha, B. Sinha

{"title":"Multimedia communication in cognitive radio networks based on sample division multiplexing","authors":"Ansuman Bhattacharya, Rabindranath Ghosh, K. Sinha, B. Sinha","doi":"10.1109/COMSNETS.2011.5716435","DOIUrl":"https://doi.org/10.1109/COMSNETS.2011.5716435","url":null,"abstract":"In this paper, we address the problem of channel sensing, channel allocation and transmission of multimedia signals in a cognitive radio network, while maintaining the required quality of service (QoS) constraints. Depending on the type of signal and QoS requirements, different types of multimedia signals need different bandwidths for communication. In typical wireless systems, unless a contiguous frequency band in the spectrum with width at least equal to the required bandwidth is obtained, multimedia communication can not occur with the desired QoS. We propose here a novel technique based on sample division multiplexing (SDM) to overcome this issue. Our proposed approach is based on utilizing several frequency bands, each of smaller width than the required bandwidth but whose sum total equals at least the required bandwidth. Towards this end, we present algorithms for channel reservation, channel sensing and allocation along with protocols for transmission and reception. Our approach also ensures preemption of secondary users by the primary users as typically demanded in a cognitive radio based communication environment.","PeriodicalId":302678,"journal":{"name":"2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011)","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131896655","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}

引用次数: 14

Reaching approximate Wardrop equilibrium at reduced costs of link state updates 在降低链路状态更新成本的情况下达到近似的Wardrop均衡

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716481

Y. Lee, Balaji Rengarajan, A. Reddy

引用次数: 3

Data integrity proofs in cloud storage 云存储中的数据完整性证明

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) Pub Date : 2011-02-17 DOI: 10.1109/COMSNETS.2011.5716422

Ashutosh Saxena, Ashutosh Saxena

{"title":"Data integrity proofs in cloud storage","authors":"Ashutosh Saxena, Ashutosh Saxena","doi":"10.1109/COMSNETS.2011.5716422","DOIUrl":"https://doi.org/10.1109/COMSNETS.2011.5716422","url":null,"abstract":"Cloud computing has been envisioned as the de-facto solution to the rising storage costs of IT Enterprises. With the high costs of data storage devices as well as the rapid rate at which data is being generated it proves costly for enterprises or individual users to frequently update their hardware. Apart from reduction in storage costs data outsourcing to the cloud also helps in reducing the maintenance. Cloud storage moves the user's data to large data centers, which are remotely located, on which user does not have any control. However, this unique feature of the cloud poses many new security challenges which need to be clearly understood and resolved. One of the important concerns that need to be addressed is to assure the customer of the integrity i.e. correctness of his data in the cloud. As the data is physically not accessible to the user the cloud should provide a way for the user to check if the integrity of his data is maintained or is compromised. In this paper we provide a scheme which gives a proof of data integrity in the cloud which the customer can employ to check the correctness of his data in the cloud. This proof can be agreed upon by both the cloud and the customer and can be incorporated in the Service level agreement (SLA). This scheme ensures that the storage at the client side is minimal which will be beneficial for thin clients.","PeriodicalId":302678,"journal":{"name":"2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134382754","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}

引用次数: 163