Fault Tolerant Dynamic Antenna Array in Smart Antenna System Using Evolved Virtual Reconfigurable Circuit

D. Dhanasekaran, K. Bagan
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引用次数: 7

Abstract

A majority of applications require cooperation of two or more independently designed, separately located, but mutually affecting subsystems. In addition to good behavior of each of the subsystems, an effective coordination is very important to achieve the desired overall performance. However, such a co-ordination is very difficult to attain mainly due to the lack of precise system models and/or dynamic parameters. In such situations, the evolvable hardware (EHW) techniques, which can achieve the sophisticated level of information processing the brain is capable of, can excel. In this paper, a new virtual reconfigurable circuit based drive circuit for array elements in smart antenna using the techniques of evolved operators is presented. The idea of this work is to develop a system that is tolerant to array element failure (fault tolerance) by utilizing phased array input programmer connected to a programmable VLSI chip. The approach chosen here is based on functional level evolution whose architecture contains many nonlinear functions and uses an evolutionary algorithm to evolve the best configuration. The system is tested for its effectiveness by choosing a real-time phase control in three element array of smart antenna with three input phases and introducing different element failures such as: element fails as open circuit, sensor fails as short circuit, noise added to individual element, multiple element failure etc.. In each case the mean square error is computed and used as the performance index.
基于进化虚拟可重构电路的智能天线系统容错动态天线阵列
大多数应用程序需要两个或更多独立设计、单独定位但相互影响的子系统的协作。除了每个子系统的良好行为外,有效的协调对于实现期望的整体性能非常重要。然而,由于缺乏精确的系统模型和/或动态参数,这种协调很难实现。在这种情况下,可进化硬件(EHW)技术能够达到大脑所能达到的复杂信息处理水平,可以脱颖而出。本文利用演化算子技术,提出了一种基于虚拟可重构电路的智能天线阵列元件驱动电路。这项工作的想法是通过利用连接到可编程VLSI芯片的相控阵输入编程器来开发一个能够容忍阵列元件故障(容错)的系统。本文选择的方法是基于功能级进化的方法,其结构包含许多非线性函数,并使用进化算法来进化最佳配置。通过在三输入相的智能天线三元阵列中选择实时相位控制,并引入不同的元件故障,如元件断路故障、传感器短路故障、单个元件加噪声故障、多元件故障等,验证了系统的有效性。在每种情况下,计算均方误差并将其用作性能指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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