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This paper studies the feasibility of using China Mobile Multimedia Broadcasting (CMMB) signal for passive radar detection. The research focuses on the analysis of CMMB signal properties which include signal structure, spectrum analysis, target resolution, ambiguity function and reduction of side lobes. Since CMMB signal has wide bandwidth and high power in its coverage area, it has great advantages...
The proliferation of the Internet technology has contributed to an increasing demand for streaming applications. The adaptation of multimedia streaming content according to context information is essential to supporting these applications. In this paper, we design a context-aware multimedia quality adaptation framework for smart streaming. The proposed framework seamlessly provides multimedia data...
In this paper, we design a Web of Objects (WoO)-based smart streaming framework to improve quality of streaming media. The proposed framework provides seamless video streaming on the basis of the context information including the network status and the device characteristics. It also accurately estimates the available bandwidth and the network delay. The implementation results show that our framework...
Most studies on the perceptual quality evaluation of multi-media services are limited to short media samples or epi-sodes, although typical usage of services occurs in a more regular way over longer periods of exposure (weeks, months or years). So far, it is unclear how the experience of individ-ual episodic use is integrated to form an experience of one service as a whole, spanning over multiple...
GStreamer is a pipeline-based multimedia framework written in the C programming language with the type system based on Gobject. Aiming at transmitting streaming media in simplex wireless channel with stochastic time slot, our paper propose a new framework based on Gstreamer to achieve real-time video collection in multi-resolution and adjustable frame rate. The video is then encoded in X264 which...
Multimedia Broadcast Multicast Service system supports efficient diffusion of multicast multimedia services in cellular networks. Our previous work shows that the radio resource management problem for MBMS can be modeled as a combinatorial optimization problem which tries to find optimal assignment of power and channel codes [1]. In this paper, we propose to solve such problem by using metaheuristic...
The recent development of hybrid broadcasting environments has meant that video delivery has attracted great attention. In hybrid broadcasting environments, clients can receive data both from a broadcasting system and a communication system. Some interruption time reduction methods have been proposed for video delivery in these environments. However, in these methods, the server does not change the...
In Multilevel Polarization Modulation (MPM), the abrupt switching among the discrete Sates of Polarization (SOPs) brings discontinuity of signal waveforms, which will broaden bandwidth and decrease the bandwidth efficiency consequently. To alleviate the problem, in this paper a Multilevel Continuous Polarization Modulation (MCPM) scheme is proposed with continuous SOP to produce continuous signal...
The Long Term Evolution (LTE) network provides high bandwidth, flexible modulation and coding scheme for emerging mobile applications. The issues of power saving and quality of services are very critical for the success of deployment of mobile applications. This paper presents a buffer aware scheduling approach to reduce power consumption while maintaining the receiving quality of video streaming...
This paper describes experimental study of Quality of Experience of compressed audiovisual materials for bandwidth-limited multimedia systems. A new method of bit rate reduction in such systems is proposed in this paper. It is based on a cross-modal audiovisual interaction-based model of Quality of Experience and takes into account that optimal audio and video codec parameters in bandwidth-limited...
In this paper, a downlink multi-carrier cognitive radio (CR) network is considered. The CR network consists of one cognitive base station (CBS) and a set of secondary users (SUs) sharing the same spectrum with the primary user (PU). Chunk-based resource allocation is adopted where subcarriers are grouped into chunks for allocation to the SUs. The problem of chunk-based resource allocation under the...
Network virtualization, known as a promising technique, has emerged as an effective method to overcome the ossification of the Internet. By enabling the co-existence of multiple heterogeneous Virtual Networks (VNs) over a shared infrastructure, network virtualization exhibits better flexibility. A crucial problem is Virtual Network Embedding (VNE), namely embedding the virtual networks to the substrate...
The current 2G and 3G network infrastructures were not originally designed with multimedia transmission in consideration. Unlike data transmission, multimedia has significantly different Quality of Service requirements. It requires significantly higher bandwidth in comparison with data transmission. Multimedia transmission over handheld devices (such as mobile phones) poses further challenges in maintaining...
Quality of Service (QoS) -- based bandwidth allocation plays a key role in real-time computing systems and applications such as voice IP, teleconferencing, and gaming. Likewise, customer services often need to be distinguished according to their service priorities and requirements. In this paper, we consider bandwidth allocation in the networks of a cloud carrier in which cloud users' requests are...
Since Internet bandwidth increase, many multimedia has be used in network, this causes the UDP user more than past. In the transmission, Using UDP was fast and immediate but UDP has some shortcoming such as not fairness. It will plunder bandwidth from other network, because it has no rule to control it is transmission rate. In the past, we could overlook this shortcoming, but the UDP user has increased,...
In this paper we apply Analytic Hierarchy Process (AHP), a multi-criteria selection scheme, for efficient JPEG2000 image and video transmission over Wireless Multimedia Sensor Networks (WMSNs). AHP exploits the advantages of JPEG2000 multi-layer and resolution features to set up the process. We show the benefits of adopting AHP scheme in comparison with a case when decisions are made by using only...
Free viewpoint video (FVV) is a new approach of interactive streaming services, where users are able to freely change their viewpoint. The desired viewpoint is synthetized from two or more camera views that must be delivered to the users depending on their continuously changing perspective. Multicast delivery of camera streams is an appropriate solution, however due to network latency and frequent...
Systems-on-chip for multimedia applications present strict requirements for the memory subsystem regarding bandwidth and latency. Typically the CPU and several IPs are connected to a multi-client memory subsystem to access data in a shared memory channel. An arbiter manages accesses conflicts due to concurrent memory requests. In this paper it is proposed an intelligent arbitration algorithm able...
The recent advances in both wireless technologies and mobile devices, fuelled by increased user interest, have driven the latest development of mobile 3D video services. However, the limited wireless bandwidth is one of the critical challenges for mobile 3D video delivery, especially as the 3D content requires higher bandwidth than the conventional 2D video. This paper proposes a network reputation-based...
Virtual screen system is becoming an essential part in the mobile cloud computing platform. However, designing a low-latency interactive communication for the high-resolution screen content is still challenging due to the network dynamics and the unique characteristics of screen content. In this paper we propose a H.264 based low-latency screen sharing system. To achieve high play-out frame rate,...
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