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There are some shortcomings in the delay tolerant network (DTN) routing algorithm, such as low message delivery rate, low network efficiency and high cost in the satellite network. In order to solve the problem above, this paper proposes a limited copy algorithm MPWLC based on service probability. In MPWLC, not only is the number of copies limited, but the storage resources of the satellite are also...
Motivated by reduction of computational complexity, this work develops a pipelined adaptive filter architecture using the sign-error least mean square (SELMS) algorithm. The proposed algorithm was implemented with less than half the amount of calculation consumed for the conventional architectures. Besides, the proposed designs derived by retiming technique and with low latency also provide a faster...
Software-defined network (SDN) is deemed to enable more dynamic management of data center networks that promptly respond to network events with changes in network policies. Although the SDN controller architecture is increasingly optimized for swift policy updates, the data plane, especially the prevailing TCAM-based flow tables on physical SDN switches, remains unoptimized for fast rule updates,...
In the existing works, a Kalman filter with recursive covariance estimation (KF-RCE) was proposed by Bo Feng et al. to sequentially estimating process noise covariance matrix. However, there may be a singular matrix existed in the KF-RCE algorithm, which would lead to unreasonable system state estimation in the system initial stage. In this paper, a threshold-based Kalman filter with recursive covariance...
VANET (Vehicular ad hoc Network) is a special kind of ad hoc wireless network where every single node is a vehicle moving in a relatively high velocity, which leads to exclusive challenges like rapid changing topologies, safety and privacy concerns. In this specific network, broadcasts tend to be carrying important messages such as car accident notification, disaster alert or extreme traffic condition...
Accuracy in detection of electrocardiographic (ECG) heart beats can be vastly improved with the aid of blood pressure (BP) monitoring. Cross validation between ECG and BP signals is used to identify the part of signals not contaminated by large, high frequency noises, where we can extract accurately the delay between the QRS peaks and BP peaks (defined in the “Methods” section). The delay is used...
Bandwidth-delay product (BDP) is an important indicator of the network capacity and usually used to measure the quality of a connection. In wireless ad hoc networks over IEEE 802.11, packets may be blocked due to link layer contention, and delay triggered by the contention called contention delay has been revealed has nothing to do with BDP. BDP in wireless ad hoc networks has been studied a lot to...
Novel path loss and delay spread models with antenna height dependency under indoor stair environment are proposed. According to the persons' posture and location of the mobile device, the antenna height is categorized as three levels: low, medium and high. The path loss is modeled by using minimum mean square error (MMSE) method; meanwhile, both of mean excess delay and RMS delay spread are modeled...
An Orthogonal Frequency Division Multiple Access (OFDMA) downlink system with secure transmissions and delay constraints is investigated, in which a base station (BS) transmits both open data with delay limitations and private data with secrecy demands to each user. The time-varying channel is modeled as slow-fading and all channel state information (CSI) is assumed to be known to BS. An online cross-layer...
This paper studies the problem of quadratic stabilization for a class of multi-time delay uncertain discrete systems. Suppose that the time-varying uncertain parameters are norm-bounded, but it is not required to satisfy a strict matched conditions, state and input for the system are both with multi-time delay. New sufficient conditions of quadratic stabilization is given for the system by generalized...
This article applies iterative learning control (ILC) to road simulation test system and simulates the control system to reproduce a stochastic pavement profile. With uniform white noise as input, using actual measured input-output data and dynamic neural network, system nonlinear autoregressive moving average model (NARMA) was established. Regarding road simulator control mission as a perfect tracking...
Based on the fitted curve model logic judgment adjustment gray forecast algorithm length of stride design ideas, in this period of time delay stage, to large inertia, large scale time delay system output responding condition comprehensive compensation research, proposed one gray adaptive prediction control method, overcome the tradition forecast PID and gray forecast control insufficiency, causes...
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