2014 IEEE Global Communications Conference最新文献_第6页

A screening methodology for crowdsourcing video QoE evaluation 众包视频QoE评价的筛选方法

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7036964

Louis Anegekuh, Lingfen Sun, E. Ifeachor

{"title":"A screening methodology for crowdsourcing video QoE evaluation","authors":"Louis Anegekuh, Lingfen Sun, E. Ifeachor","doi":"10.1109/GLOCOM.2014.7036964","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7036964","url":null,"abstract":"Recently, crowdsourcing has emerged as a cheaper and quicker alternative to traditional laboratory based Quality of Experience (QoE) evaluation for video streaming services. Crowdsourcing is a process of recruiting anonymous members of the public to solve/perform different tasks without supervision. This approach of seeking solutions from the public has been enhanced by ubiquitous internet connectivity, low cost and the ease to recruit workers without geographical restrictions. Although crowdsourcing makes it possible to save cost and reach a large group of people to perform subjective video quality testing, challenges such as validity of results and the trustworthiness of workers still remain unresolved. In this paper, we attempt to address some of these challenges by developing a screening algorithm that is able to determine the validity and trustworthiness of crowdsourcing video QoE evaluation results. This algorithm is based on evaluator's extracted data (e.g. Network IP addresses, network devices and browser information, time spent on the crowdsourcing platform, date and grading patterns). To determine the performance of this algorithm, we carried out a separate controlled laboratory based subjective video quality testing. This test enables us to determine how screened crowdsourcing results correlate with lab based results. Preliminary results show that crowdsourcing results can be improved by up to 59% when the proposed screening algorithm is applied. Moreover, the results support our assertion that crowdsourcing can provide reliable video QoE measurements if proper screening is performed on the test results.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"8 1","pages":"1152-1157"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82508473","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: 10

Resilience of LTE networks against smart jamming attacks LTE网络抗智能干扰攻击的弹性

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7036895

F. Aziz, J. Shamma, Gordon L. Stüber

引用次数: 39

Auction-based relay assignment in cooperative communications 协作通信中基于拍卖的中继分配

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037516

Bin Cao, G. Feng, Yun Li, M. Daneshmand

{"title":"Auction-based relay assignment in cooperative communications","authors":"Bin Cao, G. Feng, Yun Li, M. Daneshmand","doi":"10.1109/GLOCOM.2014.7037516","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7037516","url":null,"abstract":"The performance gain of cooperative communications depends heavily on the selection of relay. Most of existing relay selection methods aim at maximizing cooperative gain by selecting appropriate relay, without taking into account the adverse effect brought by cooperative communications: extra interferences introduced by relay transmission (called cooperation interference). Thus the derived performance gain could be inaccurate and/or the selected relay may be not optimal. In this paper, we address the assignment of relays for multiple communication sessions using cooperative communications in a wireless network. We first thoroughly investigate the adverse effect brought by using relays, and derive the cooperation gain with consideration of cooperation interference. Based on the insights of our investigation, we propose a method of assigning relays to individual transmission flows while taking into account cooperation interference in cooperative communications. In order to tradeoff the advantage and adverse effect caused by relay transmissions, we use an auction approach to address relay assignment of cooperative communications. Specifically, we propose a Single round double Auction Scheme (SAS) for centralized wireless network and a Multiple rounds sequential Auction Scheme (MAS) for decentralized wireless network for relay assignment. We conduct extensive simulation experiments to validate the effectiveness of SAS and MAS. The significance of the impact of cooperation interference, improvement of system throughput and energy efficiency are demonstrated by numerical results.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"49 1","pages":"4496-4501"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76390697","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

A user-satisfaction based offloading technique for smart city applications 基于用户满意度的智慧城市应用卸载技术

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037229

D. Mazza, D. Tarchi, G. Corazza

{"title":"A user-satisfaction based offloading technique for smart city applications","authors":"D. Mazza, D. Tarchi, G. Corazza","doi":"10.1109/GLOCOM.2014.7037229","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7037229","url":null,"abstract":"The Smart cities applications are gaining an increasing interest among administrations, citizens and technologists for their suitability in managing the everyday life. One of the major challenges is regarding the possibility of managing in an efficient way the presence of multiple applications in a Wireless Heterogeneous Network (HetNet) environment, alongside the presence of a Mobile Cloud Computing (MCC) infrastructure. In this context we propose a utility function model derived from the economic world aiming to measure the Quality of Service (QoS), in order to choose the best access point in a HetNet to offload part of an application on the MCC, aiming to save energy for the Smart Mobile Devices (SMDs) and to reduce computational time. We distinguish three different types of application, considering different offloading percentage of computation and analyzing how the cell association algorithm allows energy saving and shortens computation time. The results show that when the network is overloaded, the proposed utility function allows to respect the target values by achieving higher throughput values, and reducing the energy consumption and the computational time.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"13 1","pages":"2783-2788"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87704692","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: 12

Threshold and scaling factor optimization for enhancing impulsive noise cancellation in PLC systems 阈值和比例因子优化在PLC系统中增强脉冲噪声消除

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037261

Khaled Maaiuf Rabie, E. Alsusa

{"title":"Threshold and scaling factor optimization for enhancing impulsive noise cancellation in PLC systems","authors":"Khaled Maaiuf Rabie, E. Alsusa","doi":"10.1109/GLOCOM.2014.7037261","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7037261","url":null,"abstract":"Power-line communication (PLC) is considered as the backbone of smart grid. Impulsive noise (IN) over such channels, however, remains the main factor responsible for degrading communication signals. A simple method to mitigate IN over PLC channels is to precede the receiver with a nonlinear preprocessor to blank and/or clip the incoming signal when it exceeds a certain threshold. Applying a combination of blanking and clipping in a hybrid fashion was shown to provide the best performance. The hybrid scheme is characterized by two thresholds T1 and T2 (T1 = α.T2), where a is a scaling factor. Previous studies assume a fixed value for the scaling factor and found that optimizing the threshold T2 is the key to enhance performance. In this paper, we show that the performance of this scheme is sensitive not only to the threshold, but also to the scaling factor. With this in mind, a mathematical expression for the output signal-to-noise ratio as a function of the threshold and scaling factor is formulated and used to optimize the hybrid scheme performance. Simulation results are also provided to validate our analysis. The results reveal that using an adaptive hybrid scheme with an optimally selected threshold and scaling factor always outperforms other nonlinear schemes.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"9 1","pages":"2977-2982"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87826853","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

Energy- and spectrum-efficiency tradeoff in OFDM-based cognitive radio systems 基于ofdm的认知无线电系统的能量和频谱效率权衡

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037280

Weijia Shi, Shaowei Wang, Dageng Chen

引用次数: 13

Complex Gaussian belief propagation algorithms for distributed multicell multiuser MIMO detection 分布式多小区多用户MIMO检测的复高斯信念传播算法

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037421

Ziqi Yue, Qing Guo, W. Xiang

{"title":"Complex Gaussian belief propagation algorithms for distributed multicell multiuser MIMO detection","authors":"Ziqi Yue, Qing Guo, W. Xiang","doi":"10.1109/GLOCOM.2014.7037421","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7037421","url":null,"abstract":"In this paper, we considered a practical system where the number of base station antennas serving tens users is large but finite. The signal must be collected before detection, and the optimal maximum a posteriori (MAP) detector has high computational complexity that grows exponentially with the number of users. Even the suboptimal MMSE-SIC (soft interference cancellation) requires complexity proportional to the cube of the number of the antenna units. In this paper, we proposed a distributed detection scheme done at each antenna unit separately, termed complex Gaussian belief propagation algorithm (CGaBP), for multicell multi-user detection. The multiuser detection problem is reduced to a sequence of scalar estimations, and detecting each individual user using CGaBP is asymptotically equivalent to detecting the same user through a scalar additive Gaussian channel with some degradation in the signal-to-noise ratio (SNR) of the desired user due to the collective impact of interfering users. The degradation is determined by the unique fixed-point of state evolution equations. Numerical results show that CGaBP has low complexity and overhead, and achieves optimal data estimates for Gaussian symbols, and is better than MMSE-SIC for finite-alphabet symbols.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"1 1","pages":"3928-3933"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86860096","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: 0

Second-order statistic-based detection of Alamouti-coded OFDM signals for cognitive radio 基于二阶统计量的认知无线电alamouti编码OFDM信号检测

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037271

Yahia A. Eldemerdash, O. Dobre

引用次数: 1

Comparison of situation awareness algorithms for remote health monitoring with smartphones 智能手机远程健康监测情境感知算法的比较

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037176

I. Bisio, F. Lavagetto, M. Marchese, A. Sciarrone

{"title":"Comparison of situation awareness algorithms for remote health monitoring with smartphones","authors":"I. Bisio, F. Lavagetto, M. Marchese, A. Sciarrone","doi":"10.1109/GLOCOM.2014.7037176","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7037176","url":null,"abstract":"Telemedicine applications provide healthcare services through communications technologies overcoming the geographical separation between patients and caregivers. These services can be provided via wireless devices, such as smart-phones with dedicated applications. An interesting application concerns the so-called situation awareness algorithms and, in particular, the Activity Recognition (AR) aimed at tracking the physical activity (or movements) of patients that need a constant monitoring of their medical conditions. This work takes as reference an architecture applicable, but not limited to, patients suffering from Heart Failure (HF) and presents a performance comparison between AR approaches based on the accelerometer signal captured through the patients' smartphones. In more detail, the considered AR techniques apply two different classifiers used to decide the patients movements: a J48 decision tree and a Support Vector Machine (SVM). For each classifier, three different features sets, characterizing the accelerometer signal, have been employed. The performance are evaluated both in terms of accuracy-related metrics and time needed by each classifiers to perform the decision. The results show that SVM provides the best accuracy while the J48 requires less classification time.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"74 1","pages":"2454-2459"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86994953","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: 16

Exploiting spatial sparsity for estimating channels of hybrid MIMO systems in millimeter wave communications 利用空间稀疏性估计毫米波通信中混合MIMO系统的信道

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037320

Junho Lee, Gye-Tae Gil, Y. H. Lee

{"title":"Exploiting spatial sparsity for estimating channels of hybrid MIMO systems in millimeter wave communications","authors":"Junho Lee, Gye-Tae Gil, Y. H. Lee","doi":"10.1109/GLOCOM.2014.7037320","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7037320","url":null,"abstract":"Hybrid multiple input multiple output (MIMO) systems consist of an analog beamformer with large antenna arrays followed by a digital MIMO processor. Channel estimation for hybrid MIMO systems in millimeter wave (mm-wave) communications is challenging because of the large antenna array and the low signal-to-noise ratio (SNR) before beamforming. In this paper, we propose an open-loop channel estimator for mm-wave hybrid MIMO systems exploiting the sparse nature of mm-wave channels. A sparse signal recovery problem is formulated for channel estimation and solved by the orthogonal matching pursuit (OMP) based methods. A modification of the OMP algorithm, called the multi-grid (MG) OMP, is proposed. It is shown that the MG-OMP can significantly reduce the computational load of the OMP method. A process for designing the training beams is also developed. Specifically, given the analog training beams the baseband processor for beam training is designed. Simulation results demonstrate the advantage of the OMP based methods over the conventional least squares (LS) method and the efficiency of the MG-OMP over the original OMP.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"41 1","pages":"3326-3331"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88028110","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: 150