It is shown that the transmission and reflection group delay times in an asymmetric single quantum barrier are greatly enhanced by the transmission resonance when the energy of incident particles is larger than the height of the barrier. The resonant transmission group delay is of the order of the quasibound state lifetime in the barrier region. The reflection group delay can be either positive...

Traditionally, in IEEE 802.15.4 wireless sensor networks (WSN), cluster trees are constructed by connecting cluster heads. Though this way may reduce the number of routers, excess clusters may cause extra data transmission delay and will reduce the collection efficiency of sensing data. In this paper, we proposed a method that can effectively reduce the data transmission delay by minimizing the...

This paper presents a new video compression algorithm targeting low bandwidth conversational applications. Based on variable dimension vector quantization, video frames are encoded with variable sized image blocks in a manner which gives precise control over the number of bits assigned to each frame and hence over the transmission delay. This algorithm is compared with an implementation of H.26...

By constructing a model which takes into account the frame dependence of multimedia streams, we analyze the performance of different packet-dropping mechanisms and find that scalable video combined with the priority dropping mechanism can bring higher throughput, lower delay and lower delay jitter. We also find the optimum system parameters for multimedia transmission. This study is important f...

A new Markov-based method for real time prediction of network transmission time delays is introduced. The method considers a Multi-Layer Perceptron (MLP) neural model for the transmission network, where the number of neurons in the input layer is minimized so that the required calculations are reduced and the method can be implemented in the real-time. For this purpose, the Markov process order...

-In this paper we study the effect of round trip propagation delay in performance measures of Wavelength Division Multiplexing (WDM) networks. Even though the impact of propagation delay is substantial in optical networks behavior, most of the studies ignore the effect of this object in throughput and delay evaluation. We assume a WDM Local Area Network (LAN) where the round trip propagation de...

IEEE Control Systems Magazine February 2001 Feedback control systems wherein the control loops are closed through a real-time network are called networked control systems (NCSs) [1]-[4]. The defining feature of an NCS is that information (reference input, plant output, control input, etc.) is exchanged using a network among control system components (sensors, controller, actuators, etc.). Fig. ...

Scheduling in a Downlink channel based on partial Channel State Information at the Transmitter (CSIT) is carried out through an opportunistic technique. Within a more practical perspective, this paper first presents a transmission strategy where a minimum rate per user is required, which in a wireless fading scenario, can only be guaranteed under a certain system outage constraint. This minimum...

The minimum-energy multicast tree problem aims to construct a multicast tree rooted at the source node and spanning all the destination nodes such that the sum of transmission power at non-leaf nodes is minimized. However, aggressive power assignment at non-leaf nodes, although conserving more energy, results in multicast trees which suffer from higher hop count and jeopardizes delay-sensitive ...

When transmitting stochastically arriving data over fading channels there is an inherent trade-off between the required average transmission power and the average queueing delay experienced by the data. This trade-off can be exploited by appropriately scheduling the transmission of data over time. In this paper, we study the behavior of the optimal power-delay trade-off for a single user in the...