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In a downlink transmission, users can benefit from the high capacity gain achieved by transmitting independent data streams from multiple antennas to multiple users sharing the same physical time-frequency resources. This technique is known as multiuser MIMO (MU-MIMO). However, performance of MU-MIMO is sensitive towards propagation imperfections, such as time dispersion and inter-stream interference...
We consider a power allocation problem for three-node cooperative diversity systems using a relay node. Specifically, we focus on an amplify-and-forward (AF) protocol due to the simple operation at the relay node which makes the mathematical analysis tractable. This protocol consists of two phases. The source transmits the signal to both relay and destination in the first phase. In the second phase,...
In two-tier networks consisting of a macrocell overlaid with femtocells in co-channel deployment and closed-access policy, spatial reuse is achieved at the price of severe cross-tier interference from concurrent transmissions. The lack of direct coordination between the macro and femtocells makes interference control as a challenging issue. Cognitive radio (CR) becomes a promising solution, where...
The next generation of cellular networks (Long Term Evolution) uses SC-FDMA (Single Carrier Frequency Division Multiple Access) on the uplink. In SC-FDMA, the uplink resources assigned to a user are called Resource Blocks (RBs) each of which consists of a set of consecutive subcarriers spanning all symbols available for data. Since at most one User Equipment (UE) is assigned to each RB then uplink...
Tight bounds for the Shannon capacity of amplify-and-forward cooperative diversity networks are derived for three different adaptive source transmission policies in a myriad of fading environments: (i) constant power with optimal rate adaptation (ORA); (ii) optimal joint power and rate adaptation (OPRA); and (iii) fixed rate with truncated channel inversion (TCIFR). Our unified framework based on...
The femtocell concept is an emerging technology for deploying the next generation of the wireless networks, aiming at indoor coverage enhancement, increasing capacity and offloading the overlay macrocell traffic. One of the main challenges in short range femtocell networks is how to (re)configure the Home Node Bs (HNBs) in an autonomous manner so as to manage interference and diminish the energy consumption...
Emergency resources are prepared by the government for the unpredictable emergencies and disasters. A reasonable and optimal emergency resource location and allocation is the assurance for emergency relief as well as reducing the storage and deployment costs. China's NingxiaHui Autonomous Region, Fujian and other areas have taken shape in the province, city, town three-level relief materials reserving...
File carving is a method that recovers files at unallocated space without any file information and used to recover data and execute a digital forensic investigation. In general, the file carving recovers files using the inherent header and footer in files or the entire file size determined in the file header. NTFS supports a compression function for internal files itself. However, the NTFS compression...
We examine the issue of revenue adequacy in Financial Transmission Rights (FTR) Markets and address two questions: a) How should revenue shortfalls in FTR markets be assigned to market participants? and b) How can active participation by transmission owners in FTR markets incentivize transmission performance through incremental and long term investment? In particular we focus on the possibility of...
At present government entity information system is independent construction by entity, there are many differences in the using software, data formats, and other aspects, It lacks of unified planning and overall normative standards, resulting in difficulties of information sharing and interaction between various systems. Therefore, We should plan by emergency data sharing and exchange platform uniformly,...
Stepping into the 21st century, the appearance of e-commerce-based supply chain system completely changed the original supply chain. The interaction ways and achievement means of logistics flow, information flow and capital flow are all changed, which has improved the service quality and lowered the cost. However, the following credit risk of e-commerce transaction has become an obstacle to the continued...
The use of graph theory in social network analysis to identify the most important actors is well-known. More recently game theory has also been applied to measure centrality as variation in the power due to the social structure. Here we present such a solution concept from cooperative game theory, the Shapley value, to identify key players engaged in a network. The communication structure among the...
Adaptive allocation brings adaptive approaches in pursuit of sustainable social resource use and social-ecological information resilience. However, a lack of evidence from consistent evaluation of adaptive allocation exacerbates the doubt of this allocation. This paper revisits the issue of evaluation in information resource allocation and recasts it in light of complex adaptive systems thinking....
Typical remote sensing image interpretation consists of large number of long-lived independent computation jobs such as calibration, correction, and transformation and computation. These time consuming jobs are suitable for execution in desktop grid with high performance commodity PCs for its lower cost and high management ability. In this paper, a framework of parallel remote sensing image interpretation...
Computer Generated Forces (CGF) is virtual entities of combat force, which can be generated and controlled by computers. Human Behavior Representation (HBR) in CGF is critical for combat simulation. Yet, despite the considerable progress in related research, the challenge of dynamic task decomposition and allocation has remained largely unaddressed. This paper describes the task decomposition strategy...
Based on the deep research on Infrastructure as a Service (IaaS) cloud systems of open-source, we propose an optimized scheduling algorithm to achieve the optimization or sub-optimization for cloud scheduling problems. In this paper, we investigate the possibility to allocate the Virtual Machines (VMs) in a flexible way to permit the maximum usage of physical resources. We use an Improved Genetic...
A Grid is a decentralized, geographically distributed and heterogeneous system in which resources belong to individuals or multiple organizations. Resource management and job scheduling are two important and difficult tasks in grid computing. Scheduling and execution of jobs in a dynamic environment like Grid often calls for efficient algorithms to schedule the resources required for successful execution...
Data are special kinds of resource in grid, and their flow, management and uniform view play an important role in the grid system. This paper presents a dynamic adaptive data transfer model based on multiple replicas in the grid environment, compared with the traditional data transfer method based on single replica, the experimental results show that this model has a better transfer performance.
Cloud computing, as an emerging computing model, is drawing much attention from academia and industry. Storage resource, computing resource and network resource are three basic resources in a cloud computing infrastructure. How to utilize these resources efficiently and conveniently is a big challenge for building a good cloud computing infrastructure. This paper presents a service-oriented storage...
In order to solve the problems of laxity, redundancy and poor interaction that exist in current web curriculum resources and the effectively manage the curriculum resources, this paper is to study the ontology-based curriculum resource management model by taking data-structure curriculum as an example. Protégé ontology editing tool is used to define, classify, establish relationship for curriculum...
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