After analyzing the performance of the coherent tree - structured optimal joint detection ( tsojd ) for qpsk signals and deriving a non - coherent multi - user weight / phase estimator , the dissertation proposes a low complexity non - coherent multi - user weight / phase optimal joint detection algorithm . besides , the dissertation proposes a partial coherent multi - user / iv weight / phase optimal joint detection algorithm and some useful conclusions are obtained in comparison experiments . 4 . in the research on the diversity techniques for fast fading multi - path channels , the dissertation proposes a time - scale rake receiver , and analyzes its performance with the conception of auto - wavelet - transform ( awt ) and time - - scale resolution 提出了过饱和低复杂度qpsk信号的树型最佳联合检测算法，并分析了相应最佳接收机的性能及相位偏差对性能的影响等问题；考虑了载波相位和多用户信码的联合检测问题，通过理论推导给出了过饱和多址系统中多用户信码/相位联合估计子，提出了低复杂度非相干多用户信码/相位最佳联合检测算法，并分析了此非相干最佳接收机的误码性能及相位提取误差等有关问题；提出了部分相干多用户信码/相位最佳联合检测算法，通过计算机仿真分析了该接收机的误码性能及相位提取误差等有关问题，并与相干、非相干解调两种情况作了比较，得出了一些有益的结论。
This is due to the fact that laser beams with a flat - top profile or other kinds of profiles are desired in various applications , such as in the applications of laser fusion , laser heat treatment and optical data processing etc . nevertheless most of study on the beam shaping is concentrated on the beam shaping of spatially completely coherent beams 光束整形之所以热门,是因为这些特殊形式的光束可应用于激光光学及生物医学等领域。例如,平顶光束可应用于激光核聚变、激光热处理等领域。然而,研究者对部分相干光的光束整形的研究还很少。
The basics of lithography process , as well as the basic structure of lithographic system and the basic theory of partially coherent imaging are introduced in this paper . a bi - linear model of optical imaging is also presented . based on these theories , the simulation process of csplat is particularly analyzed , especially the computation of tccs ( transmission cross coefficient ) under different illuminations and the processing of primary lens aberrations inside tcc computation process 本文从光刻基本过程入手，介绍了光刻机光学系统的基本组成、部分相干光透射成像的基本原理，提出了光学系统的双线性模型，并在此基础上详细分析了仿真软件splat的仿真过程，其中着重分析了光学系统的传输交叉系数tcc的计算，包括不同照明系统下tcc的计算以及tcc计算中像差的处理。
Chapter 4 : the paraxial propagation of partially coherent beams with the hermite - gaussian mode is investigated . the more generalized and simple expressions of the mean squared width and the beam quality factor of the beam with different mode order are obtained in terms of the cross - spectral density . our re - sults show that the higher order strengthens the variations of the mean beam width and the beam quality factor for partially coherent beams , and the relation between the two parameters of partially coherent beams is independent of the coherence length 第四章：初步探索了部分相干厄米高斯光的傍轴传输，根据交叉光谱密度得到了其不同模阶数的平均光束束宽和光束质量因子更一般的解析表达式，较高的模阶数使得光束展宽得越快，光束质量变差，且这两个光束参量的关系与部分相干厄米高斯光的相干长度无关。
Starting from the propagation law of partially coherent light and using a typical partially coherent light , i . e . , gaussian schell - model ( gsm ) beam describing the multimode laser in practice , i present in this dissertation the research results on vectorial partially coherent light , spectral changes of partially coherent light passing through optical element , spectral switch of partially coherent light diffracted by an aperture , and the spectral anomaly of diffracted fully spatially coherent light by an aperture 本文从部分相干光的传输理论出发，以模拟实际多模激光的一类典型部分相干光? ?高斯-谢尔模型( gsm )光束为主要研究对象，对矢量部分相干光、部分相干光通过光学元件的光谱变化、被光阑衍射的部分空间相干光的光谱开关和被光阑衍射的完全空间相干光的光谱异常等现象进行了深入研究。
The main results of this thesis can be summarized as follows : 1 . based on the huygens - fresnel principle , we have derived the propagation expressions of the partially coherent beams passing through an annular lens optical system . the influence of the spectral degree of coherence , fresnel number and truncated parameter on the focused intensity distribution and focal shift is analyzed 主要工作包括: 1 .从惠更斯-菲涅耳原理出发,推导了部分相干光束通过环形透镜系统的传输公式,分析了空间相干度、菲涅耳数、拦截系数对系统中光束的聚焦光强和焦移的影响。
