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An ubiquitous mobile multimedia system for events agenda 一个无处不在的移动多媒体活动议程系统
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214139
Pedro M. P. Rosa, João A. Dias, Ivo M. C. Lopes, J. Rodrigues, Kai Lin
{"title":"An ubiquitous mobile multimedia system for events agenda","authors":"Pedro M. P. Rosa, João A. Dias, Ivo M. C. Lopes, J. Rodrigues, Kai Lin","doi":"10.1109/WCNC.2012.6214139","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214139","url":null,"abstract":"The current growth of mobile devices enabled with GPS receptors, cameras, accelerometers, and Internet access offers new opportunities for new mobile ubiquitous multimedia applications. Such applications help local communities to share resources using geo-location, interactive mapping, augmented reality, and several data representations. This paper presents CityEvents, a mobile solution that provides real time awareness-based information of local events and news. The presented ubiquitous system is a simple and easy to use event guide, providing location-awareness and content-awareness ordering data to the user. The proposal was evaluated and demonstrated in iPhone devices and it is ready for use.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129719302","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: 6
Two new approaches to bandwidth-efficient partnering for cooperative diversity 合作多样性的两种带宽高效伙伴关系新方法
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6213939
Lai Wei, Shashank V. Maiya, T. Fuja
{"title":"Two new approaches to bandwidth-efficient partnering for cooperative diversity","authors":"Lai Wei, Shashank V. Maiya, T. Fuja","doi":"10.1109/WCNC.2012.6213939","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6213939","url":null,"abstract":"This paper presents two new techniques employing bandwidth-efficient modulation to enable two partners to cooperatively convey their data to a common destination. Both approaches integrate relaying and channel coding, exploiting the fact that each partner knows the data relayed by the other partner to enhance the partner-to-partner link. The first approach is based on bit-interleaved coded modulation (BICM); a key innovation is the use of set-partition (SP) labelling that enables the receiving partner to demodulate and decode based on a sparse subset of the original constellation. The second approach is based on trellis coded modulation (TCM); the local and relayed data are multiplexed together prior to encoding, and the receiving partner prunes the trellis edges inconsistent with the known relayed data. In both approaches, the receiver at the common destination benefits in two ways - indirectly from the increased diversity made possible by the enhanced partner-to-partner link, and directly by exploiting the SP-labeling/trellis-pruning in its decoding protocol. Simulations indicate that the new techniques offer significant performance gain over conventional cooperation based on time-sharing - a gain of 2.50 dB for the 16-QAM BICM system and a gain of 3.0 dB for the 8-PSK TCM system, both at a frame error rate of 10-2.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128720310","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: 1
Uplink distributed power and receiver optimization across multiple cells 上行分布式电源和接收机优化跨多个小区
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214039
Changxin Shi, M. Honig, S. Nagaraj, P. Fleming
{"title":"Uplink distributed power and receiver optimization across multiple cells","authors":"Changxin Shi, M. Honig, S. Nagaraj, P. Fleming","doi":"10.1109/WCNC.2012.6214039","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214039","url":null,"abstract":"Interference mitigation approaches in the presence of multiple receive antennas in the uplink of a multi-cell wireless communications system are studied in this paper. A formulation based on interference pricing is proposed, where it is shown that a single price per base-station can be computed and exchanged, in order to set the mobile transmit powers per cell. The work is premised on a decentralized network architecture where schedulers make decisions on users connected to their cell, and there is a low-rate inter-cell communication link to enable distributed interference mitigation. The proposed utility maximization approach provides a general framework for multi-user multiple-input multiple-output (MIMO) systems on the uplink and accommodates both optimal (MMSE) and sub-optimal (MRC) multi-antenna receivers.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127043972","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: 5
Improving unsegmented network coding for opportunistic routing in wireless mesh network 改进无线网状网络中机会路由的未分段网络编码
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214086
Cheng Chen, Chao Dong, Fan Wu, Hai Wang, Laixian Peng, Jingnan Nie
{"title":"Improving unsegmented network coding for opportunistic routing in wireless mesh network","authors":"Cheng Chen, Chao Dong, Fan Wu, Hai Wang, Laixian Peng, Jingnan Nie","doi":"10.1109/WCNC.2012.6214086","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214086","url":null,"abstract":"Unsegmented network coding was incorporated into opportunistic routing to improve inefficient schedule of segmented network coding due to delayed feedback. However, most unsegmented network coding schemes fail to constrain the size of decoding window. Large decoding window not only challenges limited computational ability and decoding memory in practical environments, but also introduces large decoding delay, which is undesirable in delay sensitive applications. In this paper, we prove that the possibility of unacceptably large decoding window is innegligible, and verify the necessity of handling decoding window. To solve the issue, we argue that the number of unknown packets injected into the network must be strictly constrained at the source. Based on the idea, we improve unsegmented network coding scheme for opportunistic routing. Simulation results shows that the solution is robust to losses. In addition, to achieve optimal throughput, the redundancy factor should be selected larger than the reciprocal of end-to-end delivery ratio.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127513368","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: 6
On the performance of opportunistic amplify-and-forward relaying in two-wave with diffuse power fading channels 扩频功率衰落信道下两波条件放大前向中继的性能研究
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214428
Yao Lu, Xiaoxiang Wang
{"title":"On the performance of opportunistic amplify-and-forward relaying in two-wave with diffuse power fading channels","authors":"Yao Lu, Xiaoxiang Wang","doi":"10.1109/WCNC.2012.6214428","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214428","url":null,"abstract":"This paper considers cooperative networks in independent and non-identical two-wave with diffuse power (TWDP) fading channels using opportunistic amplify-and-forward (AF) relaying. We derive new closed-form expressions for the outage probability and symbol error rate (SER) in the high signal-to-noise ratio (SNR) regime. Such expressions can be applied to opportunistic AF relaying networks consisting of an arbitrary number of relays, and in different channel fading scenarios. By analyzing the asymptotic results, we analyze the diversity order and the coding gain of opportunistic AF relaying networks.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131079493","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: 1
A POMDP-based optimal spectrum sensing and access scheme for cognitive radio networks with hardware limitation 基于pomdp的认知无线网络最优频谱感知与接入方案
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6213975
Lingcen Wu, Wei Wang, Zhaoyang Zhang
{"title":"A POMDP-based optimal spectrum sensing and access scheme for cognitive radio networks with hardware limitation","authors":"Lingcen Wu, Wei Wang, Zhaoyang Zhang","doi":"10.1109/WCNC.2012.6213975","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6213975","url":null,"abstract":"In cognitive radio networks, multiple discontinuous spectrum opportunities are detected by spectrum sensing and utilized together to satisfy the service requirement by spectrum aggregation. In this paper, we develop an analytical framework for joint spectrum sensing and access scheme based on Partially Observable Markov Decision Process (POMDP). Considering the hardware limitations, the spectrum aggregation range is restricted and only a part of channels can be sensed. For obtaining the reward function of POMDP, the channel switch probability is estimated by theoretic deduction. Under this POMDP framework, an optimal spectrum sensing and access scheme is proposed to minimize the channel switch times. Simulation results show that our proposed optimal scheme reduces the times of channel switches significantly.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132058596","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
Impact of transmitting power on femto cells performance and coverage in heterogeneous wireless networks 异构无线网络中发射功率对femto蜂窝性能和覆盖的影响
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214317
J. Kélif, William Diego, S. Sénécal
{"title":"Impact of transmitting power on femto cells performance and coverage in heterogeneous wireless networks","authors":"J. Kélif, William Diego, S. Sénécal","doi":"10.1109/WCNC.2012.6214317","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214317","url":null,"abstract":"We propose a new network model framework, denoted heterogeneous fluid model network, which allows to derive closed formula for the Signal to Interference plus Noise Ratio (SINR) received by a mobile in heterogeneous cellular networks, composed of macro cells and femto cells. Quality of service (QoS) and performance of wireless networks can therefore be analyzed in a simple way. We apply our model to Long Term Evolution (LTE) and indoor/outdoor environment. This model allows to analyze the deployment of a femto cells network when the femto base stations share the same bandwidth as deployed macro cells. We propose an analysis of the impact of transmitting power femto base stations on the performance in terms of coverage, throughput and QoS.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130892004","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: 11
Wideband spectrum sensing framework for multiple slow frequency hopping primary users 多慢跳频主用户宽带频谱感知框架
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214249
Abubakar U. Makarfi, K. Hamdi
{"title":"Wideband spectrum sensing framework for multiple slow frequency hopping primary users","authors":"Abubakar U. Makarfi, K. Hamdi","doi":"10.1109/WCNC.2012.6214249","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214249","url":null,"abstract":"Cognitive radios have been advanced as a solution to improve spectral efficiency through opportunistic access of the spectrum by unlicensed users. In order to achieve its objective, a cognitive radio is required to conduct periodic spectrum sensing to avoid interfering with the licensed user of the spectrum. In this paper, we examine a multi-channel occupied by a licensed user (primary user) employing slow frequency hopping to access the channel. This method of access presents a challenge to a sensing cognitive radio node since the primary user effectively spreads its signal over the entire wideband and the spectrum holes are rapidly changing. By adopting a sensing strategy of jointly detecting all subbands in the channel simultaneously, we study the achievable unlicensed user (secondary user) throughput vis-a-vis the allowable interference on the primary network. The investigation is conducted under two cases; when the hop duration of the primary user is either synchronized or unsynchronized to the secondary user's time frame to investigate the effect of time frame misalignment which presents a more realistic model.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130894990","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: 2
A random broadcast consensus synchronization algorithm for large scale wireless mesh networks 大规模无线网状网络随机广播一致性同步算法
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214032
N. Gresset, J. Letessier
{"title":"A random broadcast consensus synchronization algorithm for large scale wireless mesh networks","authors":"N. Gresset, J. Letessier","doi":"10.1109/WCNC.2012.6214032","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214032","url":null,"abstract":"In wireless mesh networks, a robust synchronization is an enabler for optimizing performance, for example allowing powerful radio resource management and energy saving. In this paper, we combine a consensus algorithm, already proven efficient for the synchronization of wireless mesh networks, with a random broadcast for fully distributing its implementation. Unfortunately, when the distances between the wireless devices increase, the accumulation of non-negligible propagation delays resulting from the consensus algorithm introduce a drift in addition to the clock skew and offset of each node. We introduce a monitoring and broadcasting of the drift correction by a reference node that does not participate to the consensus algorithm, and show this allows for both solving the clock drift and aligning all nodes to the reference node's clock.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130408513","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: 6
Signal perturbation based support vector regression for Wi-Fi positioning 基于信号摄动的支持向量回归Wi-Fi定位
2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214342
Yubin Xu, Zhian Deng, Lin Ma, W. Meng, Cheng Li
{"title":"Signal perturbation based support vector regression for Wi-Fi positioning","authors":"Yubin Xu, Zhian Deng, Lin Ma, W. Meng, Cheng Li","doi":"10.1109/WCNC.2012.6214342","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214342","url":null,"abstract":"Location estimation using received signal strength (RSS) in pervasively available Wi-Fi infrastructures has been considered as a popular indoor positioning solution. However, accuracy deterioration due to uncertainty of RSS and offline manual calibration cost limit the deployment of Wi-Fi positioning systems. This paper proposes a signal perturbation technique to enhance existing support vector regression (SVR) based Wi-Fi positioning. By signal perturbation, more RSS training samples are generated, thus enhancing the generalization ability of SVR. In addition, access point (AP) selection method is applied to reduce the input dimension by discarding the redundant APs. The proposed method is compared with previous classical methods in a real wireless indoor environment. Experimental results show that the proposed method improves accuracy while reducing calibration cost.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127966522","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: 7
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