DD1滤波及其在非线性系统识别中的应用

DD1滤波是一种基于多元插值计算，将函数按多项式近似展开的非线性滤波方法，相对于扩展卡尔曼滤波而言，它不需要对函数进行微分运算，使得计算大为简化，且具有与扩展卡尔曼滤波相当甚至优于它的估计性能，适用范围较广。对DD1滤波及其在非线性系统识别中的应用进行了分析，给出了计算实例，计算结果表明了该方法的有效性和实用性。     

A new and efficient approach for estimating the accurate time-domain response of single and capacitive coupled distributed RC interconnects

This paper describes a novel yet highly efficient approach for estimating the time-domain response of capacitive coupled distributed RC interconnects. By using this method, the voltage signal at any particular point in such wires can be accurately and quickly obtained with very low computational cost. The proposed model exhibits a very good agreement with HSPICE simulations with worst-case error less than 3% and can be readily implemented in CAD analysis tools. This paper also presents an efficient model to estimate the capacitive crosstalk in high-speed very large scale integration (VLSI) circuits. Experimental results show that the maximum error of our peak noise predictions is less than 2.5%. In addition, this work presents an efficient artificial neural network (ANN)-based technique for modeling the time-domain response of interconnects and crosstalk noise. While existing fast noise estimation metrics may overestimate or underestimate the coupling noise, the simulation results demonstrate the ability of this approach to successfully predict coupling noise with a very good accuracy as compared to HSPICE in modest CPU times. Thereby, the proposed models and techniques can be used to predict the signal integrity for designing high-speed and high-density VLSI circuits.     

A queueing model with time‐varying QoS and call dropping for evaluating the performance of CDMA cellular systems

In this paper, we present a queueing model to evaluate the performance of CDMA reverse link in a multiple cell environment. Since CDMA capacity is interference limited, both the communication quality of ongoing calls and the admission condition of new arriving calls for each cell depend on the time‐varying signal‐to‐interference ratio (SIR). We use a quasi‐birth‐and‐death process to capture the variation of traffic loads in cells. After obtaining the stationary distribution of the system, we study some important performance indices such as the outage probability of existing calls, the blocking probability of new calls, the average carried traffic in a cell and the dropping frequency of ongoing calls. Numerical results reveal the effects of system parameters on its performance. Copyright © 2004 John Wiley & Sons, Ltd.