Adaptive IdentificationAlgorithms of Nonlinear Systems with their Applications

非线性系统的辨识在基于模型的非线性控制系统设计和无线通信非线性信号处理中起着重要的作用。该项目的主要目的是为特定类别的系统构建和评估有效和系统的非线性识别算法，以通过在非线性系统识别框架中制定它们来解决复杂的建模问题。（1）提出了一种新的基于半主动磁流变阻尼器的全自适应隔振控制方案，该方案由两个自适应控制器组成。一种是自适应逆控制器，该控制器能给MR阻尼器提供所需的输入电压，使其产生作用于被控结构上的给定参考阻尼力。另一种是自适应参考控制器，它可以将结构的第一层的动力学与期望的参考动力学相匹配。所提出 ...更多信息 三维全自适应方法可以同时处理磁流变阻尼器模型和结构模型的不确定性。包括两个适应机制的整个系统的稳定性进行了讨论，并澄清了稳定性条件。实验结果也验证了所提出的自适应方案的有效性。（2）由于OFDM传输中的信息是以复幅度为单位的，因此功率放大器的非线性补偿是一个重要的问题。本计画提出一种新的自适应预失真器，它可以补偿非线性失真，同时可以最大化功率效率。提出了一种新的自适应耦合抵消算法，该算法识别了所有的传输路径动态特性，并阐明了收敛条件。（3）将城市多径环境下移动的站的阵列天线定位问题归结为一个新的非线性参数辨识问题，通过阵列信号处理来估计目标散射源的方向和角度扩展，并且还可以估计源位置，使得由射线追踪方法计算的方向和角度扩展与由阵列天线室外实验验证了该方法的有效性。将阵列天线的自校准也看作是一个非线性辨识问题，并将其应用于Capon方法。研究了阵列天线检测相关信号个数的方法，提出了一种基于改进QR分解的简单有效的方法。少

Identification of a nonlinear system plays an important role in model-based approaches in nonlinear control system design and nonlinear signal processing for wireless communication. The main purpose of the project is to construct and evaluate effective and systematic nonlinear identification algorithms for a specific class of systems to solve complicated modeling issues by formulating them in a nonlinear system identification framework. The results are summarized as follows :(1)A new fully adaptive control scheme is proposed for vibration isolation using a semi-active MR damper installed between ground and first floor, which is composed of two adaptive controllers. One is an adaptive inverse controller which can give necessary input voltage to MR damper so as to generate specified reference damping force acted on a controlled structure. The other is an adaptive reference controller which can match the dynamics of the first floor of structure to a desired reference dynamics. The propose … More d fully adaptive approach can deal with both uncertainties in models of MR damper and structure. The stability of the total system including the two adaptation mechanisms is discussed and the stability conditions are clarified. Experimental results are also shown to validate the effectiveness of the proposed adaptive scheme.(2)Since the information is taken on the complex amplitude in the OFDM transmission, compensation of the nonlinearity of power amplifier is a significant issue. The project proposed the new adaptive predistorter which can compensate for nonlinear distortion as well as can maximize the power efficiency. The new adaptive coupling cancellation algorithm was also proposed in which all of the transmission path dynamics are identified and convergence conditions are clarified.(3)Localization of mobile station in urban multipath environments by using an array antenna is formulated as a new nonlinear parameter identification issue, where the direction and angle spread of scattered sources produced by the station are estimated by the array signal processing, and the source location can also be estimated so that the error between the direction and angle spread calculated by the ray tracing method and those estimated by the array antenna. Its effectiveness was validated by outdoor experiments. Autocalibration of array antenna is also regarded as a nonlinear identification problem, and the idea was applied to Capon method. Detection of the number of correlated signals by array antenna is also investigated and a simple but effective method was proposed based on improvements of QR decomposition. Less