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In this paper, we present a novel Cluster-based Separate Networking Coding (CSNC) scheme, as a solution to solve the problem of continuous data collection for WSNs with a mobile BS. By separately encoding a certain number of data segments in a combined data segment and doing decoding-free data replacement, CSNC not only provides efficient storage method for continuous data, but also maintains a high...
Femtocells are considered as an enabler for low power, high bit rate future mobile access networks. In this study, we look at them as a technology to cover an area with a high bit rate connectivity. From the evaluation it is clear that sleep modes are imperative to maximise the energy efficiency of the mobile access network. We evaluate the power reduction and wake up time of different sleep modes...
In this work, we present a QoE-aware mobile IPTV multicast system over WiMAX network. In the proposed system, the adaptive transmission algorithm at a base station determines the control parameters of a fountain-encoded IPTV multicast stream adaptively to the wireless link states of subscribers in order to provide a stable IPTV multicast service with minimum resource usage on WiMAX network, and the...
Prior research on wireless multicast video streaming has addressed the risk of feedback implosion when providing adaptive forward error correction (FEC). This approach has not been adopted by providers, who may either stick to unicast streaming or use a sufficient level of application layer FEC to avoid the need for adaptation. Instead in this paper, an adaptive unicast rateless channel coding scheme...
We propose a novel locality sensitive vocabulary coding scheme to extract compact descriptors for low bit rate visual search. We employ Latent Dirichlet Allocation (LDA) to learn the topic vocabularies of lower dimension to generate compact descriptors. To deal with diverse datasets, LDA model is introduced to subdivide a dataset into groups of images with a topic model, where the code word distributions...
Blue force tracking is one of the heaviest users of data services in tactical networks. The amount of traffic generated to track network nodes can be tuned, but reducing the frequency of updates reduces the quality of the stored information. In ground-based VHF tactical networks, the available bandwidth is extremely low and naïve approaches for the global exchange of location information cannot be...
Deploying mobile devices to frontline troops presents many potential benefits, e.g. situational awareness, enhanced communication capabilities, etc. However, security remains an impediment to realizing such capability. In this research, we develop and evaluate an approach to securing the non-volatile storage of a collection of mobile devices. Our technique relies on well-established cryptographic...
The direct mode in H.264/AVC can efficiently improve the coding performance of B pictures, since it exploits the spatial or temporal correlation by deriving its motion vector from previously encoded information. Therefore, it does not require any additional motion information and could save many bits. Considering the spatial and temporal correlation has not been fully exploited in the current direct...
Wireless sensor networks (WSN) is becoming large-scale. It's meaningful to gather sensor data quickly and efficiently. In this paper, we present a new approach to collect sensor data by distributed rateless coding. Rateless codes, such as Luby Transform (LT) codes have been proved possessing a very good property that receivers can decode all k original packets from arbitrary k(1+ε) encoded packets...
Serial link interconnection has generated a lot of attention in on-chip bus design due to its advantages over multibit parallel interconnection in terms of crosstalk, skew, and area cost. However, serializing a multi-bit parallel bus tends to increase the bit transition and power dissipation. This paper proposes an embedded transition inversion (ETI) coding scheme that uses the phase difference between...
The recent popularization of hand-held mobile devices, such as smartphones, enables the inter-connectivity among mobile users without the support of Internet infrastructure. When mobile users move and contact each other opportunistically, they form a Delay Tolerant Network (DTN), which can be exploited to share data among them. Data replication is one of the common techniques for such data sharing...
In this paper we present the possibilities of implementing evolution algorithm on a mobile platform. To inspect such possibilities we have created a Pac-man like mobile game that is implemented together with evolutionary programming. Here the interest does not only lie on performing the evolution algorithm on the mobile platform but also to examine the possibilities in implementing interactive evolution...
A signal detection technique using successive interference cancellation (SIC) for uplink cooperative cellular systems is proposed in this paper, to suppress the interference caused by the cooperative transmission of two mobile users transmitting both their own information and the cooperative partner's information using distributed space-time coding (DSTC). Simulation results show that the proposed...
The emergence of affordable mobile devices with rich interfaces and high-bandwidth wireless connectivity has revolutionized the mobile Web. However, such new trends also imply downloading larger data volumes from the Web, with considerable battery and, often, monetary costs that inevitably degrade user experience. The mobile Web calls for end-to-end data deduplication that is able to achieve both...
The error concealment is an important technique in the video transmission that can assure the reconstruction video quality and can efficiently recovery the data loss and the data errors in the transmission process caused by the transmission environment, thus improve the subjective quality of the video received in the end. In order to enhance the error resilience of AVS-P2 standard, in this paper,...
Service Oriented Computing and Global Computing are emerging paradigms for distributed computing. Many foundational models and calculi have been proposed for these paradigms. Despite their differences, these calculi essentially extend the traditional process calculi with novel abstractions tailored to handle specific issues. In this paper, we study the Signal Calculus which is a process calculus designed...
The objective of Mobile video monitoring system is to provide high performance low latency video streaming to the client side. This work presents an effective system design and implementation for mobile video monitoring. We focus on the whole system design and some key issues on video encoding and decoding. We compare our design to existing solutions and experiment results demonstrate the efficiencies...
The paper overviews the transmission chain of 3D television for mobile services with special emphasis on stereoscopic video transmission. Specifically, methods for source and channel coding are overviewed for their suitability for such applications. They are analyzed in terms of performance and complexity as well as in terms of user acceptance and satisfaction. Furthermore, viewing conditions involving...
This paper addresses the memory bandwidth problem of motion estimation in resource limited mobile video applications by an integrated bandwidth rate distortion optimization framework. The simulation result shows up to 86% bandwidth saving while keeps equivalent rate-distortion (R-D) performance and meets real time target compared with H.264 reference software for low motion CIF size video. For high...
In this paper, a fast H.264 intra-prediction mode algorithm based on texture characteristic is proposed. Firstly adopt DCT operation on each target block and get the texture direction and variance of the block being coded with the coefficient in frequency domain. And then predict the intra-frame coding mode most accurately with the parameters obtained before. Experiment results show that the PSNR...
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