Int. J. Digit. Multim. Broadcast.最新文献_第6页

Model Aspects of Open Access to Multimedia Broadcast Services in the Evolved Packet System 演进分组系统中多媒体广播业务开放访问的模型方面

Int. J. Digit. Multim. Broadcast. Pub Date : 2016-03-02 DOI: 10.1155/2016/3154801

I. Atanasov, E. Pencheva

{"title":"Model Aspects of Open Access to Multimedia Broadcast Services in the Evolved Packet System","authors":"I. Atanasov, E. Pencheva","doi":"10.1155/2016/3154801","DOIUrl":"https://doi.org/10.1155/2016/3154801","url":null,"abstract":"Multimedia broadcast is the most efficient method to distribute identical content to multiple users in the Evolved Packet System (EPS). EPS enables efficient usage of network resources and provisioning of quality of service for every user. Third-party control allows applications in an enterprise domain to invoke network functions like multimedia broadcast. In this paper, an approach to modeling the behavior of Service Capability Server (SCS) for multimedia broadcast in EPS is presented. Third-party applications can access multimedia broadcasting capabilities by using Parlay X Web Service interfaces. The SCS for multimedia broadcast exposes Parlay X interfaces toward 3rd-party applications and control protocols toward the network. The SCS functional behavior has to be synchronized with the application view on message broadcast and the state of the network resources intended for the broadcast session. Models of multicast session, IP connectivity session, and bearers’ and charging session are proposed and formally described using the notation of Label Transition Systems. The concept of weak bisimilarity is used to prove that models expose equivalent behavior; that is, they are synchronized.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134212318","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: 4

On the Feasibility of Unlicensed Communications in the TV White Space: Field Measurements in the UHF Band 电视空白频段免许可通信的可行性研究:UHF频段的现场测量

Int. J. Digit. Multim. Broadcast. Pub Date : 2015-02-23 DOI: 10.1155/2015/319387

M. Fadda, V. Popescu, M. Murroni, P. Angueira, J. Morgade

引用次数: 39

Decision Feedback Blind Equalizer with Tap-Leaky Whitening for Stable Structure-Criterion Switching 稳定结构准则切换的决策反馈漏白化盲均衡器

Int. J. Digit. Multim. Broadcast. Pub Date : 2014-12-31 DOI: 10.1155/2014/987039

V. Krstic, M. Dukic

引用次数: 7

Generalized Block-Diagonalization Schemes for MIMO Relay Broadcasting Systems MIMO中继广播系统的广义块对角化方案

Int. J. Digit. Multim. Broadcast. Pub Date : 2014-12-31 DOI: 10.1155/2014/305846

Xianan Wang, Xiaoxiang Wang, Wenrong Gong, Zijia Huang

引用次数: 3

A New QIM-Based Watermarking Method Robust to Gain Attack 一种新的抗增益攻击的qim水印方法

Int. J. Digit. Multim. Broadcast. Pub Date : 2014-09-11 DOI: 10.1155/2014/910808

Y. Zolotavkin, M. Juhola

引用次数: 0

Spatial Multiple Description Coding for Scalable Video Streams 可扩展视频流的空间多重描述编码

Int. J. Digit. Multim. Broadcast. Pub Date : 2014-08-25 DOI: 10.1155/2014/132621

R. Choupani, Stephan Wong, M. Tolun

{"title":"Spatial Multiple Description Coding for Scalable Video Streams","authors":"R. Choupani, Stephan Wong, M. Tolun","doi":"10.1155/2014/132621","DOIUrl":"https://doi.org/10.1155/2014/132621","url":null,"abstract":"The need for adapting video stream delivery over heterogeneous and unreliable networks requires self-adaptive and error resilient coding. Network bandwidth fluctuations can be handled by means of a video coding scheme which adapts to the channel conditions. However, packet losses which are frequent in wireless networks can cause a mismatch during the reconstruction in the receiver end and result in an accumulation of errors which deteriorates the quality of the delivered video. A combination of multiple description coding in pixel domain and scalable video coding schemes which addresses both video adaptation and robustness to data loss is proposed in this paper. The proposed scheme combines error concealment with spatial video scalability. In order to improve the fidelity of the reconstructed to the original frames in presence of packet loss, a multilayer polyphase spatial decomposition algorithmis proposed. Classical multiple description methods interpolate themissing data which results in smoothing and artifact at object boundaries. The proposed algorithm addresses the quality degradation due to low-pass filtering effect of interpolation methods.We also comparatively analyze the trade-off between robustness to channel errors and coding efficiency.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131567649","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

Efficient Time-Frequency Localization of a Signal 有效的信号时频定位

Int. J. Digit. Multim. Broadcast. Pub Date : 2014-08-25 DOI: 10.1155/2014/529852

S. Chand

{"title":"Efficient Time-Frequency Localization of a Signal","authors":"S. Chand","doi":"10.1155/2014/529852","DOIUrl":"https://doi.org/10.1155/2014/529852","url":null,"abstract":"A new representation of the Fourier transform in terms of time and scale localization is discussed that uses a newly coined A-wavelet transform (Grigoryan 2005). The A-wavelet transform uses cosine- and sine-wavelet type functions, which employ, respectively, cosine and sine signals of length . For a given frequency , the cosine- and sine-wavelet type functions are evaluated at time points separated by on the time-axis. This is a two-parameter representation of a signal in terms of time and scale (frequency), and can find out frequency contents present in the signal at any time point using less computation. In this paper, we extend this work to provide further signal information in a better way and name it as -wavelet transform. In our proposed work, we use cosine and sine signals defined over the time intervals, each of length , , and are nonnegative integers, to develop cosine- and sine-type wavelets. Using smaller time intervals provides sharper frequency localization in the time-frequency plane as the frequency is inversely proportional to the time. It further reduces the computation for evaluating the Fourier transform at a given frequency. The A-wavelet transform can be derived as a special case of the -wavelet transform.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116795517","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

A Model for Video Quality Assessment Considering Packet Loss for Broadcast Digital Television Coded in H.264 考虑丢包的H.264广播数字电视视频质量评估模型

Int. J. Digit. Multim. Broadcast. Pub Date : 2014-04-03 DOI: 10.1155/2014/242531

J. Joskowicz, R. Sotelo

{"title":"A Model for Video Quality Assessment Considering Packet Loss for Broadcast Digital Television Coded in H.264","authors":"J. Joskowicz, R. Sotelo","doi":"10.1155/2014/242531","DOIUrl":"https://doi.org/10.1155/2014/242531","url":null,"abstract":"This paper presents a model to predict video quality perceived by the broadcast digital television (DTV) viewer. We present how noise on DTV can introduce individual transport stream (TS) packet losses at the receiver. The type of these errors is different than the produced on IP networks. Different scenarios of TS packet loss are analyzed, including uniform and burst distributions. The results show that there is a high variability on the perceived quality for a given percentage of packet loss and type of error. This implies that there is practically no correlation between the type of error or the percentage of packets loss and the perceived degradation. A new metric is introduced, the weighted percentage of slice loss, which takes into account the affected slice type in each lost TS packet. We show that this metric is correlated with the video quality degradation. A novel parametric model for video quality estimation is proposed, designed, and verified based on the results of subjective tests in SD and HD. The results were compared to a standard model used in IP transmission scenarios. The proposed model improves Pearson Correlation and root mean square error between the subjective and the predicted MOS.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"207 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131625102","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: 21

Performance Evaluation of Concurrent Multipath Video Streaming in Multihomed Mobile Networks 多主移动网络中并发多径视频流的性能评价

Int. J. Digit. Multim. Broadcast. Pub Date : 2013-08-26 DOI: 10.1155/2013/319594

James Nightingale, Qi Wang, C. Grecos

{"title":"Performance Evaluation of Concurrent Multipath Video Streaming in Multihomed Mobile Networks","authors":"James Nightingale, Qi Wang, C. Grecos","doi":"10.1155/2013/319594","DOIUrl":"https://doi.org/10.1155/2013/319594","url":null,"abstract":"High-quality real-time video streaming to users in mobile networks is challenging due to the dynamically changing nature of the network paths, particularly the limited bandwidth and varying end-to-end delay. In this paper, we empirically investigate the performance of multipath streaming in the context of multihomed mobile networks. Existing schemes that make use of the aggregated bandwidth of multiple paths can overcome bandwidth limitations on a single path but suffer an efficiency penalty caused by retransmission of lost packets in reliable transport schemes or path switching overheads in unreliable transport schemes. This work focuses on the evaluation of schemes to permit concurrent use of multiple paths to deliver video streams. A comprehensive streaming framework for concurrent multipath video streaming is proposed and experimentally evaluated, using current state-of-the-art H.264 Scalable Video Coding (H.264/SVC) and the next generation High Efficiency Video Coding (HEVC) standards. It provides a valuable insight into the benefit of using such schemes in conjunction with encoder specific packet prioritisation mechanisms for quality-aware packet scheduling and scalable streaming. The remaining obstacles to deployment of concurrent multipath schemes are identified, and the challenges in realising HEVC based concurrent multipath streaming are highlighted.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132963989","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

Optimization of ATSC Mobile Handheld Service Capacity ATSC移动手持业务容量优化

Int. J. Digit. Multim. Broadcast. Pub Date : 2013-03-24 DOI: 10.1155/2013/837153

O. Issa

引用次数: 0