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Infrastructure as a service (IaaS) is a form of cloud computing, which converts physical machines (PMs) to various types of resources by virtualization technology, and delivers these resources to customers by a on-demand way. However, different customer requirements complicate the usage of resources. In this paper, we employ a high level formalization way, Performance Evaluation Process Algbra (PEPA),...
A hybrid direct sequence and frequency hopping (DSFH) spread spectrum signal can greatly improve ranging precision and jamming resisting capability in spacecraft TT and C (Tracking, Telemetry and Command). The frequency hopping adds another searching dimension to acquisition and increases the acquisition complexity. Therefore, this paper designs a phase-compensating-based acquisition algorithm. First,...
Wide-I/O dynamic random access memory (wide I/O DRAM) is one of promising solutions to increase the memory bandwidth. Similar to modern double-data-rate DRAMs, the minimum burst length of wide I/O DRAM is at least two. Thus, either a read or a write operation is executed, two words will be read or written at least each time. This causes that the testing of inter-word coupling faults becomes complicated...
The FCC new regulation for cognitive use of the TV white space spectrum provides a new means for improving traditional cellular network performance. But it also introduces a number of technical challenges. This paper studies one of the challenges: given the significant differences in the propagation property and the transmit power limitations between the cellular band and the TV white space, how both...
The IEEE 802.11p/1609 standards specify a suite of communication protocols for vehicular communication networks. One control channel and six service channels are used in such a network. Ideally, the data transmission load generated by all service providers and their user stations should be spread over all of the six service channels evenly to fully utilize the aggregate bandwidth of these service...
This paper presents a direct-conversion, multi-standard TV receiver implemented in a 0.13 µm CMOS technology occupying less than 4 mm². The receiver is compliant with several direct broadcasting satellite (DBS) standards, including DVB-S, DVB-S2, and ABS-S. A novel automatic frequency tuning (AFT) technique is adopted based on a searching algorithm to ensure less than 6% bandwidth deviation of the...
Based on the requirement of the transmission of real-time service in wireless sensor networks, the paper studies Weighted Fair Queuing (WFQ) algorithm profoundly. Having analyzed the reason why WFQ can't ensure the quality of real-time service, it proposes P-WFQ, which is a priority-based Weighted Fair Queuing (P-WFQ) algorithm. With sliding windows, P-WFQ combines WFQ and the priority-based mechanism...
While multiple access links enhance the availability and utilization of multicast service nodes, the resource allocation balancing needs to be performed on a link basis, which is usually not considered in most overlay multicast routing algorithms. To accurately represent the bandwidth consumption of each overlay node, we need not only a multihomed proxy model to describe the overlay multicast routing...
Compared with traditional IP Multicast, overlay multicast is not only flexible in functionality but also compatible with current network infrastructure. Therefore it is emerging as an effective solution for most group communications over the Internet. Affected by end-host overlay systems, the overlay multicast routing problem is studied under a single homed model in most literatures. Under this model...
In this paper we propose a scalable admission control scheme for the QoS sensitivity traffic in core-stateless networks. In our scheme, the ingress routers perform admissibility test in a fully distributed and parallel fashion for requests by dint of our bandwidth dividing based virtual link mechanism. Then, we introduce a novel two phase token passing mechanism to adaptively optimize the proportion...
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