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This paper presents the delay results of wideband wireless channel measurements conducted in urban environment for base station to vehicle at 3.35 GHz and 5.4 GHz, respectively. Channel impulse responses are collected in both line-of-sight (LOS) and non-line-of-sight (NLOS) propagation. Based on the measurement data, power delay profiles are extracted. Delay statistical characteristics like mean excess...
Push-to-Talk over Cellular (PoC) system in mobile communication network, such as TD-SCDMA, is considered to have more wide coverage and more flexibility than traditional trunk communication systems. It is ideal for group communication in many cooperative work environments. But the foremost block for wider application of PoC system is the longer session setup latency comparing to other trunk communication...
A large-scale deployment of femto BSs (FBSs) will result in the substantial energy consumption. One fairly intuitive way to improve energy efficiency for femtocells is a sleep mode where the FBS periodically transmits pilot signal especially in low traffic scenario. Nevertheless, it is inefficient when not involved an active call in the FBS coverage area. To address this issue, this paper proposes...
Single-phase grid-connected converters are widely used in many applications, such as photovoltaics, fuel cells, active power filters, etc. An important topic for the development of their control schemes is ac signal detection, such as grid phase detection for grid-interfacing inverters, and harmonic detection for harmonic compensation devices. Since only one ac signal is available, the task is more...
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 mobile cognitive radio networks, the expected delay for a packet to be delivered to its destination via a singlehop communication (without relaying) is a fundamental metric that can provide a guidance to multi-hop routing protocol design and route planning. In this paper, we characterize the impact of PU activities, spectrum availabilities, channel bandwidth, MAC access, SU mobilities, and interference,...
This paper proposes an improved power control approach to address the load sharing problems in islanded microgrids. The proposed method first estimates distributed generation (DG) unit feeder impedances through measuring low order point of common coupling (PCC) harmonic voltages and DG unit line harmonic currents. With the knowledge of feeder impedances, reactive power sharing performance can be enhanced...
This paper presents a novel diagnosis algorithm for small delay defects (SDD). Faster-than-at-speed test sets are generated by masking long paths in the circuit for testing SDD. The proposed diagnosis technique uses timing upper and lower bound to improve the diagnosis resolution. Also, timing-aware single location at a time (TA-SLAT) technique is proposed to diagnose multiple SDD. Test results of...
The paper proposed a reconfigurable parallel hardware structure targeted at linear feedback shift register. As to the reconfigurable performance, the structure could reconfigure different LFSR in various stream ciphers. As to the parallel performance, the proposed hardware structure could support parallel update of LFSR sequences in one clock cycle. Besides, with the tradeoff between the flexibility...
This paper analyses the queueing systems with batch Poisson arrivals and Generalised exponential (GE)service and gives closed form expressions for performance distributions, such as steady state queue length distribution (q.l.d.), blocking probability and waiting time distribution. The analytical performance expressions provide network engineers and researchers a tool to analysis the queues with batch...
In this paper, a novel non-saturation analytical model for enhanced distributed channel access (EDCA) in IEEE 802.11e wireless local area network (WLAN) is proposed. Unlike previous work focused on saturation conditions, this model uses Markov and M/M/1/K theories to predict MAC delay, service time, throughput and loss. Moreover, the EDCA technique resets the default contention window (CW) of stations...
In order to sustain a longer lifetime, an important research in the Wireless Sensor Network (WSN) is to improve power efficiency. Review of many technologies in the involvement, the essential idea is to remove power redundancy. The GAF algorithm is able to get a WSN with longer lifetime by reducing the node redundancy in transmitting data, On the other hand, the CODE, based on the GAF algorithm, is...
During the grid synchronization of distributed generating (DG) units, phase-locked loop (PLL) is well accepted as an efficient approach to detect grid phase angle. Conventional PLL schemes used in DG controller have to compromise between steady-state accuracy and transient dynamics when grid voltage is polluted by unbalance and harmonics. To simultaneously realize good steady-state and transient performances,...
With the increasing convergence and cooperation among wireless networks, network awareness of user equipment (UE) has become very important. A practical solution for network information delivery for UE, Cognitive Pilot Channel (CPC), has recently been proposed. It can provide UE with the necessary network information for network selection by using the public signaling channel. In this paper, a cognitive...
Allusion to the various different requirements QoS's quota such as delay sensitivity of multi-medium business for Multi-media communication in Heterogeneous wireless network, we put forward the attemper arithmetic of classify queue based on multi-medium communication. Grade the now operation according to the factors of flux, delay and error tolerance etc, and the node that participates transmission...
This paper investigates the problem of robust guaranteed cost fault-tolerant control for networked control system with norm-bounded uncertain parameters. Both network-induced delay and data packet dropout are taken into consideration, and data packet dropout is regard as a kind of special delay. The synthetical delay is a interval time-varying delay, and possesses fast time-varying characteristic,...
By using the method of Lyapunov function and analysis technique, a model for bidirectional associative memory with impulsive and delay is studied. Sufficient conditions are obtained for the existence of ω-periodic solution and all other solutions are globally exponentially convergent to it.
This paper analyses the existence and globally exponential stability of a class of cellular neural networks with distributed delays, with assuming global Lipschitz conditions on the activation functions, applying the idea of vector Lyapunov function, Young inequality and Halanay differential inequality with delay, some sufficient conditions are obtained to ensure the equilibrium point.
In this paper, a Hopfield-type neural network with distributed delays and impulses are investigated. Some sufficient conditions are obtained for the global exponential stability and existence of the periodic solution to the Hopfield-type neural networks with distributed delay and impulsive on time scales.
By using the Lyapunov functional and some inequality technique, some sufficient conditions are obtained for the global exponential stability and existence of the periodic solution to the BAM neural networks with distributed delays on time scales. In fact, the results can be easily applied in practice.
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