This novel transmit diversity technique , which combines channel coding , modulation and signal processing at receive terminal , can make full use of the fading multi - path in the wireless communication systems so as to mitigate the signal attenuation . this technique is mainly designed to combat channel fading in downlink transmission by combining the technique of channel coding and that of array diversity , hence increasing the capacity of wireless communications systems and giving diversity gain and coding gain to them 基于多输入输出( mimo )的空时编码技术是实现未来带宽资源日益紧张的高速无线数据通信系统的重要技术,它结合了信道编码、调制和接收端的信号处理,能够充分利用无线通信信道中多散射体环境所造成的多径,从而提供信号的抗衰落性能。
First in this paper , we review the development of radar signal processing and cfar detector , analyse the structure and principle of the signal processor , ca - cfar and os - cfar detectors . then , in view of the characteristic of prc cw signal , analyses the statistics characteristic of scattering bodies , models of target , noise , ground - clutter and weather - clutter are made . these lay a theoretic foundation of signal processing and cfar detector 然后,本文针对x波段伪随机m序列相位编码连续波信号体制,分析了各种散射体的统计特性,对雷达目标及检测背景噪声(热噪声、地杂波和气象杂波)进行了理论分析和统计检验,建立了目标及检测背景的目标模型,确立了信号处理和恒虚警检测的理论基础。
Then , base on the determine channel modeling methods , we present a frequency - selective mimo fading channel with von mises probability density function , which is used to characterize non - uniform angle - of - arrival caused by non - isotropic scattering . then we analyze partial cross correlation function of proposed model and proved the model theoretically 然后,通过对其它多入多出信道模型的分析和对比,并基于确定性信道建模方法,建立了一种通用的频率选择性多入多出衰落信道模型,借助“ vonmises ”概率密度函数,以描述非均匀散射体导致的非均匀本地来波方向分布。
The purpose of this theme is to classify sar images into four regions : man - made targets ( vehicles and buildings ) , natural targets ( trees and shrubbery ) , background ( field and grass ) and shadow ( the target shadow and mirror scatter ) . on the one hand , the processed results can be directly used as image product , which offer necessary parameters for expert ' s interpretation to build up an independent auxiliary interpreting system . on the other hand , the results can be introduced into sar image interpreting system as the replacing target detection and discrimination models with layer rois ( region of interest ) in order to provide potential target chips 具体内容为：根据sar图像基本特性，提取可靠特征，将图像区分为人造目标(机动车辆、建筑物等) 、自然目标(树木、灌木、树林等) 、背景(草地、平地、植被等)和阴影(目标阴影、镜面散射体等)四种类别，为不同的应用提供对应的感兴趣区域( roi ) 。
A new study of specially spherical - glowing optical fiber is present in this paper , a large core silica optical fiber is melt the ball and is spread all scattering body evenly on the round spherical terminal surface , which is melt the ball to the spherical terminal surface again , thus getting the output optical fiber needed . 4 . designing the system of testing the specially spherical - glowing optical fiber 3 .设计研制了一种特殊球形输出光纤,实验中采用大芯径石英光纤,利用光纤熔接机对石英光纤端面进行熔球,在圆球形端面上均匀涂上光散射体,对所得的球形端面再次进行熔球,从而得到所需要的输出光纤。
Second some scatter location algorithms are analyzed . because one kind of the scatter location algorithm depends on the scatter model , two scatter location algorithms are analyzed which can make precise location to the scatters and mobile station , non - linear least square scatter location algorithm and closed - form scatter location algorithm . the simulation results show that the non - linear least square scatter location algorithm has two limitations : ( 1 ) at least six multipath signal are needed 然后分析讨论了现有的多种基于散射体信息的无线定位算法,由于基于散射体信道模型的定位算法太依赖于模型的准确性,因此本文主要分析了对散射体精确定位的算法中的两种:非线性最小二乘散射体算法和闭式散射体算法,并对这两种算法进行了仿真分析。
3 . a new scheme to distinguish the single target or multiple target in the case of low resolution is developed by applying the two scatterer algorithm ( tsa ) in complex - image analysis ( cia ) theory , and the cia results of a sphere and a corner reflector are studied for the purpose of target identification 探讨了复像分析在目标识别中的应用，提出了利用一维tsa算法来分辨单目标与多目标，并利用复像分析研究了简单的球体目标与具有复杂散射体在散射机理上的不同之处。
