Low-complexity and fast convergent multiuser detections for impulse UWB systems

To solve the problem that the conventional detections in DS-CDMA suffer from high complexity and poor robustness for the time-hopping pulse signals, the received pulse signals were remodeled, and a mulfipath-free detection scheme, which provides a simple approach to select samples of received signals, was introduced. By this scheme, the subsequent multiuser detection （MUD） would get rid of the mis- match due to the correlative multipath signal in IR-UWB. In addition, a computationally efficient recur-sive least squares （RLS） type algorithm based on least mean fourth （LMF） criterion is derived to suppress multi-access interference. The proposed multiuser detection algorithm performs well at low complexity, even in dense muhipath environment.

数学形态滤波在局部放电信号分析中的应用研究

介绍了数学形态滤波的基本原理与形态滤波器的构建。针对油纸绝缘典型局部放电故障模型的局部放电信号的分析问题,提出一种基于开、闭运算的级联组合数学形态滤波器的新方法。通过将数学形态滤波器用于复杂局部放电信号中的脉冲干扰的实例分析,说明该方法对局部放电信号的干扰噪声有很好的滤波效果,实现了高频信号无时滞、无相移的滤波处理,表明数学形态滤波对分析局部放电脉冲信号有很好的应用前景。