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The multi-tracking problem of second-order multi-agent system with communication delay is investigated in this paper. An intermittent control protocol is proposed on the basis of only relative position measurement, where the information of agent is quantized before transmission using stochastic quantization scheme. On the basis of algebraic graph theory, stochastic quantization and stability theory,...
This paper has proposed a design for networked control systems with random time delays and packet dropout in the forward communication channel by using fuzzy theories. First, a simple predictive model was built by means of fuzzy cluster modeling technology and neural network approximation. Then, a prediction oriented fuzzy sliding mode controller was presented to obtain the future control actions'...
The a priori signal-noise-ratio (SNR) estimator plays a very crucial role in the performance of a noise reduction system. The decision-directed (DD) approach, which is the most widely used technique for estimating the a priori SNR, suffers from one-frame delay bias when following the a posteriori SNR. Many modifications of the DD approach in the literature focus on accelerating the tracking speed...
In this paper, the second-order consensus of multi-agent systems with nonlinear dynamics and time-varying delays is studied. Using the impulsive algorithm, some sufficient conditions to achieve consensus are derived. The obtained conditions show that if the given matrix inequalities are feasible, the consensus of the multi-agent systems can be reached exponentially. Finally, some simulations are presented...
To overcome significant PVT variation in ultra-low-voltage (ULV) operation, a new in-situ error detection and recovery mechanism is proposed to optimize circuit design for typical-case. The proposed technique detects glitch of a (ctitical-path) circuit output within the setup-time duration of a flip-flop and stalls the clock source, if possible, until the output is stable once an error is detected...
To build an experimental platform for wireless sensor networks based on 802.11 high rate data transmission protocol, AODV-UU and DSR-UU high rate routing protocols are implemented on the Smart210 development board with embedded Linux operating systems in this paper. In a real static environment, the average end to end delay, packet loss rate and throughput of the network system are tested and compared...
This paper presents a low-power hearing aid chip which operates under near-threshold voltage region to minimize energy consumption. The proposed variable-latency design technique compensates the performance degradation under ultra-low voltage, while the proposed FIR filter computing datapath improves the energy efficiency for filter bank computation in hearing aids. The hearing aid system composed...
We address the problem of routing for multi-radio multi-channel wireless mesh networks, and propose a novel routing metric, named DARM. Compared with the prior routing metrics focus on the network throughput, DARM aims to minimize the end-to-end delay, which is a significant requirement for multimedia applications. Our routing metric captures the effects of variation in link loss-ratio, the length...
Based on contraction mapping principle, inequality technique, global exponential stability of a class of BAM neural networks with distributed delays is considered. Some sufficient conditions are derived which ensure the existence, uniqueness, global exponential stability of equilibrium points of the neural networks. Finally, the obtained results are demonstrated with a numerical example.
By means of contraction mapping principle, inequality technique, global exponential stability of a class of BAM networks with delays is considered. Some sufficient conditions are obtained which ensure the existence, uniqueness, global exponential stability of equilibrium point of the networks. Finally, a numerical example is discussed in this paper to illustrate advantage of the results we derived.
The modified repetitive control system is a type of servo mechanism designed for a periodic reference input. Recently, the parametrization of all stabilizing modified repetitive controllers is obtained by Satoh and Yamada. Since the parametrization of all stabilizing modified repetitive controllers is obtained, we can express previous studies of modified repetitive control system in a uniform manner...
Delay requirement becomes a key problem for the time sensitive applications in wireless sensor networks besides the power conservation issue. This paper proposes a novel network utility maximization (NUM) model with constrained delay for real-time applications in wireless sensor networks. By using dual decomposition techniques, we present a distributed iterative price and rate adaption algorithm which...
Invoking SDMA in the down-link (DL) has the potential of increasing the achievable throughput with the aid of linear transmit preprocessing, provided that the channel impulse responses (CIRs) of all users and all antenna elements are known at the DL transmitter. However, in a frequency division duplex (FDD) system, since these CIRs have to be transmitted by the mobile terminals (MTs) to the base station...
This paper presents piecewise Lyapunov functions applied to analyze the stabilization of a piezoelectric actuator system with input time delay. Furthermore, a stability theorem is proposed to relax the limit conditions. The piezoelectric actuator system is represented by the Takagi-Sugeno (T-S) fuzzy model. According to the developed stability theorem, we find the feasible solution of feedback gains...
The bandwidth performance of an adaptive two- element array with sensor delay lines (SDLs) attached is studied in terms of the inter-spacing between delay line sensors and the number of delay line sensors added. Compared with adaptive arrays with tapped delay-lines (TDLs) the new SDL structure has a better performance in two aspects: its output SINR drops less as the inter-delay within delay lines...
Most routing protocols for sensor networks try to extend network lifetime by minimizing the energy consumption, but have not taken the network reliability into account. To be adaptive to the harsh environment, we propose an energy-aware, load-balancing and fault-tolerant routing scheme, termed as ELFR. We first present a network robustness model. Based on this model, we design the route discovery...
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