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To deal with problems that queuing information is not included in cognitive information when performing Resource Allocation (RA), a dynamic cross-layer scheme is proposed for the multimedia cognitive radio (CR) system with Orthogonal Frequency Division Multiplexing (OFDM). In this scheme, we consider that several crucial factors influence the RA decision, including channel state information, interference...
This paper presents a hybrid switch that parallels a power MOSFET and an IGBT as the main switch of a zero-voltage switching inverter. The combination features the MOSFET conducting in the low current region and the IGBT conducting in the high current region, and the soft switching avoids the reverse recovery problem during the device turn-on. A custom hybrid switch module has been developed for a...
Network coding is a promising technique to improve the throughput performance of wireless networks. In this paper, we propose a novel network-coding-based hybrid retransmission request protocol for two-way relaying system. The proposed protocol can retransmit more information in a given time interval by introducing network coding in the retransmission process, thus improving the throughput. Furthermore,...
This paper is concerned with the problem of stability of systems with time-varying delay in a given interval. A novel Lyapunov-Krasovskii functional is proposed to obtain new stability conditions. Some triple integral terms are introduced in the Lyapunov-Krasovskii functional and the information on the lower bound on the delay are sufficiently used. New delay-dependent stability criteria are derived...
This paper considers the distributed optimal (i.e., linear minimum variance) fusion estimation problems for two classes of networked multi-sensor systems. In the first class of systems, the sensors' measurements are transmitted via unreliable digital communication networks (DCN) to local estimators for obtaining local estimates of the state. Then the local estimates are fused in the fusion center...
End-to-End transport protocols can not provide satisfying communication service in interplanetary backbone networks because of the long propagation delay and high BERs characteristics. This paper proposed a renovation protocol based on hop-by-hop Acknowledgment against the traditional end-to-end protocols for interplanetary backbone networks, which used Hop-by-Hop SNACK and End-to-End SNACK to ensure...
Push-to-Talk over Cellular (PoC) system is ideal for group communication in many cooperative work environments because of its wider coverage and more flexibility than traditional trunk communication systems. The long session-setup-delay is an important problem that must be solved before the commercial application of PoC system. Many research works have been done to solve it in some mobile networks,...
In this paper, we study a class of fractional functional differential equation with delay. We use Green function to reformulate the boundary value problem into an abstract operator equation. The existence of positive solutions of the boundary value problem for this class of fractional functional differential equation is obtained by using fixed point theorems on cone.
Wormhole switching technology is widely used in High Performance Computer (HPC) systems. The delay estimation of wormhole switching is mainly focused on average packet delay. But in order to provide Quality of Service (QoS) guarantees, we should analyze the end-to-end delay bound of wormhole switching. Based on models of Credit Stall and Switch Allocation Stall, we use arrival curve to constrain the...
This paper illustrates a semi-active handover algorithm on the integrated utilization of RSS and location, according to characteristics of a cellular network and WiFi. While connecting to a cellular network, MS (Mobile Station) is in the passive mode, where BS (Base Station) informs the MS to hand over on the basis of location information. In contrast, MS in the WiFi link chooses the optimal AP (Access...
A food chain system with Bedding-type functional response is investigated. By employing Comparability Theorem and Mawhin's Continuation Theorem of Coincidence Degree Theory, a set of easily verifiable sufficient conditions are obtained to guarantee the permanence of the system and the existence of positive periodic solutions of the system. Some new results are obtained.
Vehicular ad hoc networks (VANETs), which are a class of Mobile ad hoc networks, have recently been developed as a standard means of communication among moving vehicles. Congestion is one of the key issues which can restrict the Network performance, and it is no exception for VANETs. Congestion control mechanisms include three phases: congestion detection, congestion notification and rate adjustment...
Triple play convergence is now one of the important national strategies in China. Stimulated by the need of building a network that is capable of both Telecom and broadcasting services, an optical transport network (OTN) testbed is planed and deployed in Eastern China from 2009 to 2011. This testbed demonstrates the state of the art technologies in optical transport network design. It also features...
This paper investigates the robust stability for time-delay Hamiltonian systems with polytypic uncertainties. Both delay-independent and delay-dependent criteria are established based on the dissipative structural properties of the Hamiltonian systems and the Lyapunov-Krasovskii (L-K) functional approach. All the proposed stability conditions are expressed in terms of Linear Matrix Inequality (LMI)...
Risks and uncertainties are major concerned in the construction of large-scale projects like weapon equipment, whose success shall be got through a compulsory evaluation on those risks and uncertainties during the execution of the projects. And the technology readiness has gained wide attentions in recent years with its characteristics like hierarchy, delicacy, etc. and played a very important role...
A number of routing schemes have been proposed for intermittently connected mobile networks. In these schemes, a node carries a message and forwards the message to another node that it meets. To increase the delivery success rate, typically, multiple copies of the message are created and forwarded to multiple neighbor nodes. The neighbor nodes are selected based on such criteria as the probability...
Equipment contractor support is the innovative practice and urgent requirement to promote new-type equipment forming operational and support capability. The support delay time is a significant discrimination between contractor support and Army support. As concerned breach of contract problem, the paper will take research on three kinds of support delay time: non-repair parts supply delay time, personnel...
Considering physical sensors with certain sensing capabilities in an Internet-of-Things (IoT) sensory environment, in this paper, we propose an efficient energy management framework to control the duty cycles of these sensors under quality-of-information (QoI) experience in a multi-task-oriented IoT sensory environment. Contrary to past research efforts, our proposal is transparent and compatible...
We Propose a 2K/4K/8K point FFT (Fast Fourier Transform) for OFDM (Orthogonal Frequency Division Multiplexing) of DVB-H (Digital Video Broadcast Terrestrial) Receiver. The proposed FFT architecture utilizes cascaded radix-4 single path feedback (SDF) structure based on the Radix-2/Radix-4 FFT algorithm.[11] We use block floating point scaling technique in order to increase SQNR. The 2K/8K FFT consists...
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