Frequency: Quarterly E- ISSN: 2277-2278 P- ISSN: Awaited Abstracted/ Indexed in: Ulrich's International Periodical Directory, Google Scholar, SCIRUS, getCITED, Genamics JournalSeek
Quarterly published in print and online "Inventi Impact: Digital Multimedia Broadcasting" publishes high quality unpublished as well as high impact pre-published research and reviews catering to the needs of researchers and professional engineers. The journal deals with multiple aspects of digital multimedia broadcasting pertaining to mobiles, televisions etc.
We consider a face-to-face\nvideoconferencing system that uses a Kinect camera at\neach end of the link for 3D modeling and an ordinary\n2D display for output. The Kinect camera allows\na 3D model of each participant to be transmitted;\nthe (assumed static) background is sent separately.\nFurthermore, the Kinect tracks the receiver�s head,\nallowing our system to render a view of the sender\ndepending on the receiver�s viewpoint. The resulting\nmotion parallax gives the receivers a strong impression\nof 3D viewing as they move, yet the system only needs\nan ordinary 2D display. This is cheaper than a full\n3D system, and avoids disadvantages such as the need\nto wear shutter glasses, VR headsets, or to sit in a\nparticular position required by an autostereo display.\nPerceptual studies show that users experience a greater\nsensation of depth with our system compared to a\ntypical 2D videoconferencing system....
This paper proposed a broadcast Channel Assignment Mechanism on base of\noptimized Broadcast Tree for wireless Mesh network (WMN), which is created by Branch and\nBound Method. The simulations show that our algorithm not only reduces the broadcast\nredundancy but also avoids the potential channel interferences produced by unnecessary relay\nnodes....
Data stream mining has become a research hotspot in data mining and has attracted the attention of many scholars. However, the\ntraditional data stream mining technology still has some problems to be solved in dealing with concept drift and concept\nevolution. In order to alleviate the influence of concept drift and concept evolution on novel class detection and classification, this\npaper proposes a classification and novel class detection algorithm based on the cohesiveness and separation index of Mahalanobis\ndistance. Experimental results show that the algorithm can effectively mitigate the impact of concept drift on classification and\nnovel class detection....
We investigate into the potentiality of an enhanced Power and Location-based Vertical Handover (PLB-VHO) approach, based\r\non a combination of physical parameters (i.e., location and power attenuation information), for mobile-controlled connectivity\r\nacrossUMTS and WLAN networks.We show that the location information in amultiparameter vertical handover can significantly\r\nenhance communication performance. In the presented approach a power attenuation map for the visited area is built and\r\nkept updated by exploiting the information sharing of power measurements with other cooperating mobile devices inside the\r\nvisited networks. Such information is then used for connectivity switching in handover decisions. The analytical model for the\r\nproposed technique is first presented and then compared with a traditional Power-Based approach and a simplified Location-Based\r\ntechnique. Simulation results showthe effectiveness of PLB-VHOapproach, in terms of (i) network performance optimization and\r\n(ii) limitation of unnecessary handovers (i.e., mitigation of ping-pong effect)....
Video surveillance is an effective way to record current events. In view of the difficulty of efficient transmission of massive\nsurveillance video and the risk of leakage in the transmission process, a new data encryption and fast transmission algorithm is\nproposed in this paper. From the perspective of events, the constraints of time and space dimension is broken. First, a\nbackground and moving object extraction model is built based on video composition. Then, a strong correlation data encryption\nand fast transmission model is constructed to achieve efficient data compression. Finally, a data mapping mechanism is\nestablished to realize the decoding of surveillance video. Our experimental results show that the compression ratio of the\nproposed algorithm is more than 60% under the premise of image confidentiality....
A new distance-aware broadcasting algorithm was proposed to enhance the propagation distance in the latency time of safetyrelated\nmessage broadcasting. The IEEE 802.11p standard states that if the medium is detected as idle, a station would defer its\ntransmission within a backoff time to avoid collisions with other stations.The backoff times follow uniform distribution over [0,\nCW]. In this way, fairness among all the stations can be guaranteed. However, propagation distance was ignored and in safetyrelated\nmessage broadcasting fairness is not the most important issue. In the proposed algorithm, the lengths of backoff times\nare generated from a nonuniform distribution.They are related with the distances between the source station and its forwarding\nstations.The farthest forwarding station has the highest probability to forwardmessages. Performance of the proposed algorithmis\nanalyzed by using a 2D Markov chain. Analytical and simulation results demonstrate that the proposed algorithm can enhance\nthe performance of safety-related message broadcasting in terms of propagation distance, which is reflected by the successful\ntransmission probability. The proposed algorithm does not need additional waiting time, RTS/CTS, and ACK, therefore having\nbetter compatibility with the IEEE 802.11p standard than earlier distance-aware algorithms...
IPTV services are typically featured with a longer channel changing delay compared to the conventional TV systems. The major\ncontributor to this lies in the time spent on intraframe (I-frame) acquisition during channel changing. Currently, most widely\nadopted fast channel changing (FCC) methods rely on promptly transmitting to the client (conducting the channel changing)\na retained I-frame of the targeted channel as a separate unicasting stream. However, this I-frame acceleration mechanism has\nan inherent scalability problem due to the explosions of channel changing requests during commercial breaks. In this paper, we\npropose a fairness-based admission control (FAC) scheme for the original I-frame acceleration mechanism to enhance its scalability\nby decreasing the bandwidth demands. Based on the channel changing history of every client, the FAC scheme can intelligently\ndecide whether or not to conduct the I-frame acceleration for each channel change request. Comprehensive simulation experiments\ndemonstrate the potential of our proposed FACscheme to effectively optimize the scalability of the I-frame acceleration mechanism,\nparticularly in commercial breaks. Meanwhile, the FAC scheme only slightly increases the average channel changing delay by\ntemporarily disabling FCC (i.e., I-frame acceleration) for the clients who are addicted to frequent channel zapping....
This paper deals with radio resource allocation in fourth generation (4G) wireless mobile networks based on Orthogonal\r\nFrequency Division Multiple Access (OFDMA) as an access method. In IEEE 802.16m standard, a contiguous method for\r\nsubchannel construction is adopted in order to reduce OFDMA system complexity. In this context, we propose a new subchannel\r\ngain computation method depending on frequency responses dispersion. This method has a crucial role in the resource\r\nmanagement and optimization. In a single service access, we propose a dynamic resource allocation algorithm at the physical layer\r\naiming to maximize the cell data rate while ensuring fairness among users. In heterogeneous data traffics, we study scheduling in\r\norder to provide delay guaranties to real-time services, maximize throughput of non-real-time services while ensuring fairness to\r\nusers.We compare performances to recent existing algorithms in OFDMA systems showing that proposed schemes provide lower\r\ncomplexity, higher total system capacity, and fairness among users....
We study the important problem of resource allocation for the downlink of Multiple-Input Multiple output (MIMO) Multicast\r\nWireless Systems operating over frequency-selective channels and we propose a low-complexity but efficient resource allocation\r\nalgorithm for MIMO-enabled OFDMA systems. The proposed solution guarantees a minimum spectrum share for each user\r\nwhile also takes advantage of the multicast transmission mode. The presence of multiple antennas in both transmitter and receiver\r\noffers spatial diversity to the system along with the frequency diversity added by the OFDMA access scheme. The computational\r\ncomplexity is reduced from exponential to linear and validation of the proposed solution is achieved through various simulation\r\nscenarios in comparison with other multicast and unicast reference schemes used in MIMO-OFDMA systems. Numerical results\r\nand complexity analysis demonstrate the feasibility of the proposed algorithm....
This paper presents a model to predict video quality perceived by the broadcast digital television (DTV) viewer. We present how\nnoise on DTV can introduce individual transport stream (TS) packet losses at the receiver. The type of these errors is different\nthan the produced on IP networks. Different scenarios of TS packet loss are analyzed, including uniform and burst distributions.\nThe results show that there is a high variability on the perceived quality for a given percentage of packet loss and type of error.\nThis implies that there is practically no correlation between the type of error or the percentage of packets loss and the perceived\ndegradation. A new metric is introduced, theweighted percentage of slice loss, which takes into account the affected slice type in each\nlost TS packet.We showthat this metric is correlated with the video quality degradation.Anovel parametric model for video quality\nestimation is proposed, designed, and verified based on the results of subjective tests in SD and HD. The results were compared to a\nstandard model used in IP transmission scenarios. The proposed model improves Pearson Correlation and root mean square error\nbetween the subjective and the predicted MOS....
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