In order to make the apertures distribution of the power dividers satisfy the taylor distribution of the horizontally polarized direction of the array , the rake angle and depth of cut of each slot should be adjusted 为了使功分器各端口的幅度分布满足阵列在水平极化方向的泰勒分布,需要调节功分器上各条缝隙的倾角、切割深度。
This paper mainly deals with uav - based rake methods using modern signal and information processing techniques . with the detailed analysis of the low - elevation model and conventional rake receiver , an investigation of the rake method is presented 论文在详细分析了低仰角信道模型和传统rake接收机基本原理和特点基础上，对适应地?空数据链的rake技术进行了深入研究。
In order to utilize the resoluble ability of signals and improve resistant ability to multipath fading , the rake receiver is a good option . but proper rake operation requires information about the delays and attenuations of the channel paths which is difficult to obtain 本文以uwb通信系统为背景,主要研究uwb系统室内密集多径信道的信道估计方法,以及基于turbo原则的迭代信道估计的接收机结构。
Finally , the application of mud in the frequency - flat slowly fading multi - path channel is introduced , and to enhance the system efficiency the joint use of the rake receiver and mud is applied in the frequency - selective slowly fading multi - path channel 最后，在讨论了平坦慢衰落信道的基础上，将rake分集技术和多用户检测技术相结合应用于多径的频率选择性慢衰落信道，以达到改良系统的性能的目的。
We set the system model of the rake receiver , analyze its principle and propose its implementation scheme . furthermore , we study a rake receiver which supports macro diversity . some problems which must be concerne d in the system realization are also discussed in this part 建立了rake接收机的系统模型，分析了其工作原理，给出了其实现方案，并在此基础上介绍了一种支持宏分集的rake接收机的实现原理，同时对工程实现过程中需要考虑的一些问题进行了探讨。
And the pn code synchronization scheme adequate for the wcdma uplink is presented and combined with finger management , channel estimation and mrc algorithms to complete the rake receiver scheme . simulations on pd / pf and pd / ebno show the scheme has good preformance and meets the requirement of wcdma uplink in 3gpp protocols 分别采用pd / pf方法和bler / ebno方法对同步方案进行仿真,仿真结果表明,本论文提出的扩频码同步方案的捕获概率和虚警概率能满足要求,同时总体接收机方案能达到3gpp协议中上行链路的性能要求。
The paper has improved the existing lifting - line and lifting - surface design method by including the rake and skew and solving the optimum circulation distribution with the optimum theory . the blade geometry is expressed with b - spline for the lift - surface method . the boundary condition on the blade is transformed to minimize the summation of the square of normal velocities , the fair blade geometry can be obtained by present technique and the design quality is better 改进了现有的升力线和升力面设计方法，在升力线设计中计及桨叶的纵倾和侧斜的影响，用优化理论求解最佳环量分布，升力面设计中用b样条来拟合桨叶，将物面边界条件转化为求法向速度分量的平方最小，由此可得到光顺的桨叶几何形状，提高和改进了设计质量。
The viterbi decoder with hard decision designed by the paper , is aimed at ( 3 , 1 , 9 ) convolutional coding . the data rate is 9 . 6kbps . the data rate received by the rake receiver is spreaded by 127 - bit spread sequences , added pilot signals and modulated by qpsk 该课题所设计viterbi译码是针对( 3 , 1 , 9 )卷积码的硬判决译码,数据速率为9 . 6kbps ; rake接收机所接收的数据是扩频因子为127 、加入导频且经qpsk调制的扩频信号,使用verilg硬件描述语言在xilinx公司的ise环境下在用现场可编程门阵列( fpga )来实现viterbi译码器和rake接=收机的功能。
And the pn code tracking scheme adequate for the wcdma uplink is presented and combined with the mulipath acquisition and channel estimation algorithms to complete the rake receiver scheme . computer simulations show the tracking scheme meets the requirement of wcdma uplink in 3gpp protocols and has good performance 通过大量的计算机仿真和验证，证明本论文提出的同步跟踪方案完全能达到3gpp协议对上行链路接收机的要求，具有较好的性能，同时指出进一步研究和提高的思路。
Secondly , based on cutting edge geometric model and machining mode of mk6335a grinder , the rake face with constant normal rake angle and flank face with constant orthogonal clearance angle models of ball - end cutters are discussed . the cutting geometry angle parameters are solved and analyzed . moreover , the tool paths models of wheel which grinding are builded and the post - processing technique for coordination transfer is studied 然后,基于刃口曲线模型、五轴数控磨床刃磨运动方式和微分几何的直纹面概念,本文推导与建立了具有等法前角的前刀面和具有等主后角的后刀面的球头立铣刀数学模型,并对球头立铣刀的刀具角度如刃倾角、主前角、法后角、主偏角等参数进行了求解与分析。
