Design of Adaptive Beam Former Using 2 Dimensional Lattice Filters and Its Performance Verfication

(1)建立了一种对信号模型误差具有鲁棒性和减少计算量的自适应波束形成新方法。为了减小模型误差的影响，我们在时域上基于特征向量约束校准广义旁瓣对消方法推导出阻塞矩阵和传递矩阵。(2)提出了一种估计扬声器到达方向的麦克风阵列系统。它利用了元音等谐波成分。该方法在定向噪声和传感器噪声下均有效。(3)提出了一种基于GMA自适应阵列和抽头延迟线的接收机，用于DS/CDMA系统的频率选择性衰落和同信道干扰抑制。研究了三波约束CMA模型的收敛性。在分析结果的基础上，我们提出了一种新的准则来选择成功捕获所需信号的模因子。(4)提出了一种基于线性阵列Hopfield网络的到达方向估计方法。该方法对传感器误差具有较强的鲁棒性。此外，该方法还可用于估计分布式源的DOA。这些方法在低信噪比条件下也能给出正确的方向。(5)提出了一种与最优贝叶斯符号检测具有相同结构的径向基函数（RBF）网络数字信道均衡器。提出了一种寻找RBF正确中心的聚类算法。仿真结果表明，与传统算法相比，该算法收敛性好，计算量少。(6)提出了一种基于输入相关函数的自适应梯度搜索算法。该算法用于电话会议系统中的回波消除。

(1) A new method of adaptive beam forming which is robust against signal model errors and reduces computational load is established. In order to reduce the affection of the model errors, we deduce both blocking matrix and passing matrix based on the method of eigenvector constrained calibrated Generalized Sidelobe canceller in the time domain.(2) The microphone array system to estimate direction-of-arrival of speaker is proposed. It utilizes harmonic component such as vowel sound. It is effective under a directional noise and sensor noise.(3) A receiver using GMA adaptive array combined with Tapped Delay Line is proposed for frequency selective fading and co-channel interference suppression in DS/CDMA systems. We investigate the convergence behavior of the constrained CMA with three waves model. Based on analytical results, we propose a novel criterion to select a modulus factor of capturing desired signal successfully.(4) An estimation method of direction-of-arrival using Hopfield network with linear array is proposed. The proposed method is robust for sensor error. Additionally, the method is useful to estimate DOA of distributed source. These methods can give proper direction even the low SNR condition.(5) It is proposed that a digital channel equalizer using radial basis function (RBF) network which has identical structure to the optimal Bayesian symbol-detection. A clustering algorithm has been proposed to find the correct center of RBF. The simulation results show its better convergence and less calculation than the conventional algorithm.(6) A new algorithm for tap adaptation to search gradient by input correlation functions is proposed. This algorithm is used for echo cancellation in teleconference systems.