Direction of Arrival Estimation for CDMA Communication Signal

MUSIC algorithm is often applied in direction of arrival estimation of communication signal or radar signal. But the traditional MUSIC algorithm is not applicable in the presence of the correlational signals. Combining with time average processing, an algotithm of two-dimensional space-time average is suggested on the base of space average technic especially for the DOA estimation of CDMA communication signal. A detaild analysis and a conclusion about this improved algorithm is presented. Ensuring the accurary of the estimation an efficient decrease in quantity of operation is achieved with the algorithm, so it is more suitable for real-time processing. The efficiency of the improved algorithm is attested by the emulating results.     

Parametric Bispectrum Estimation and Slice Analysis for Pulse Signals

Higher-order statistics method is an overhead subject in the fields of signal processing in the world in recent years. The pulse signals are analyzed by applying parametric bispectrum estimation. Non-Gaussian AR model is for calculating the bispectrum of pulse signals for 15 heroin addicts and 15 healthy persons. Characteristic parameters of magnitude bispectrum of the pulse signals are obtained by using horizontal slices of magnitude bispectrum. Characteristic parameters of bispectrum phase of the pulse signals are obtained by using horizontal slices of bispeetrum phase. Moreover,two primary criterions are also obtained by using the characteristic parameters. Exactness ratios of two pnmary criterions reach 93.3% and 90%, respectively. The research result shows that parametric bispectmm estimation for analyzing pulse signals of heroin addicts is really an effective method.     

Information fusion for tactile sensor array signals

According to the solubility parameters of aged asphalt system, the effect of the recycling agent components on the compatibility of aged asphalt was studied by using the molecular dynamics method. And the mechanism between the recycling agent and the aged asphalt is investigated based on the interaction energies analysis. The results show that the aromatic is helpful to improve the compatibility of aged asphalt, and the more the aromatic is, the better the recycling effect would be. However, the effect of saturate is negative. These results are consistent with the experimental data. With the increase in dosage, the interaction energy between aromatic and aged asphalt increases significantly because of their bigger electrostatic interaction energy and smaller Van der Waals forces. However, the interaction energy between the saturate and aged asphalt shows no obvious change in which the electrostatic and van der Waals interaction energy is almost the same. The main factor for aged asphalt recycling is electrostatic interaction energy between molecules.     

质量-数量性状遗传参数估计的P1、 P2、 DH联合分析方法

本文提出利用亲本P1、 P2及其DH三个群体联合分析包括两个位点主基因控制的质量-数量性状遗传的统计方法, 共建立了五类共22个遗传模型, 进而, 可采用AIC信息准则选择最适模型, 并通过适合性检验对所选择的遗传模型做进一步的检验。