基于高阶累积量的盲自适应多用户检测

基于高阶累积量,讨论一种新的盲多用户检测方法.首先,分析一种新的优化准则,证明该优化准则在满足规范约束条件下具有全局最小值,且极值点满足解相关条件.由此,得到一种新的盲多用户接收方案.然后,利用约束优化问题的一个无约束条件的等价形式,给出盲多用户检测的自适应算法.仿真结果表明,本文给出的检测器具有较强的多址干扰抑制性能.

Demarcation in Space Domain for Local Flaw Signals of Wire Ropes and Feature Extraction in Frequency Domain Based on Wavelet Transform

In wire rope test,an important characteristic is to identify the features of wir e rope flaw signals in frequency domain.Based on wavelet transform techniques,a new demarcation method in space domain and a new frequency feature extractive me thod for local wire rope flaw signals are proposed in the paper.Furthermore,the types of wire rope flaws can also be identified by the wavelet network quantitat ively.The experimental results show that the proposed method can clearly distinc t the noise and flaws in wire rope flaw signals.Using proposed method in this pa per,the performance of wire rope flaw detective instrumentation can remarkably i mproved.