At first , the thesis discusses the hardware implementing arithmetic of fast fourier transform ( fft ) and some correlative problems need to be solved . and according to the thesis " design demand and characteristic of large - scale programmable logic device ( pld ) , the thesis designs an implementing scheme of fft processing machine based on pld 首先，论文研究了快速傅立叶变换( fft )的硬件实现方法以及有限字长效应等问题，并根据论文的设计要求和大规模可编程逻辑器件的特点，设计了一个基于可编程逻辑器件的fft处理机实现方案。
First , the implementation project of the if digital receiver of tdrss user transponder by the fpga and dsp cooperation design method is proposed in this thesis . then , the software simulation system for the if digital receiver is built up , definite word - length effect is analyzed , and some useful conclusions are derived , which provides reference for the following hardware design and debug 本文首先采用fpga与dsp协同设计的方法实现该接收机的方案，然后建立了该中频数字接收机的软件仿真系统，对有限字长效应进行分析，得到了一些重要结论，为下一步的硬件设计和调试提供了参考。
The core is based on harvard architecture with 16 - bit instruction length and 8 - bit data length . the performance of mcu has been improved greatly by introducing single - clock - cycle instructions , setting multiple high - speed working registers and replacing micro - program with direct logic block etc . to keep the mcu core reusable and transplantable , the whole mcu core has been coded for synthesis in verilog hdl 该mcu核采用哈佛结构、 16位指令字长和8位数据字长，通过设计单周期指令、在内部设置多个快速寄存器及采用硬布线逻辑代替微程序控制的方法，加快了微处理器的速度，提高了指令的执行效率。
Having analyzed the chaos theory thoroughly , we choose a model carefully that can be easily realized by hardware . now i will introduce the work of this paper form following three aspects : first , we bring forward a way to generate gauss sequences by chaotic system . besides , we put forward a methods to produce pn sequences based on 本文通过对混沌理论的深入理解,认真选取易于硬件实现的混沌模型着重做了以下三方面工作:第一:提出了一种利用混沌模型产生高斯序列的方法,并且,为了克服由于计算机有限字长产生的短周期现象,我们提出了基于双混沌模型的伪随机序列生成方法。
In the simulation work , one 1 . 5kw and one 18kw induction motors ? control system were simulated and two simplified control scheme were proposed . when developing the program in tms320f240 dsp , this paper solved two practical problems : the finite - length effect and dc bias effect . finally , sensorless control system based on adaptive filter theory are tested on the platform of 1 . 5kw induction motor , the results show that the scheme ? performance is good 在仿真过程中，针对1 . 5kw和18kw异步电机进行了仿真，并在此基础上提出两种简化控制方式；在tms320f240的具体编程过程中，分别对自适应滤波器的有限字长效应、直流偏置效应等非理想因素进行了修正和补偿；最后，在1 . 5kw微型异步电机上进行了转矩闭环无速度传感器实验，实验结果表明了算法完全可以达到预期的目标。
In the body of the dissertation , different performance indexes are defined and analyzed based on the analysis of different types of fwl errors in digital controller , and different fwl digital controller design and realization problems are considered and solved . the major contributions of this dissertation are as follows : considering the fwl errors of controller coefficients , define and analyze the closed - loop transfer function sensitivity measure with respect to the controller coefficients , obtain the optimal controller realizations via minimizing the transfer function sensitivity measure 本论文首先对数字系统，特别是数字控制器设计与实现中的有限字长问题和非脆弱控制器设计的背景、历史发展情况等作了简单介绍，然后通过分析数字控制器中不同来源的有限字长误差，定义不同的性能指标，较系统地分析并讨论不同的有限字长数字控制器设计和实现问题。
The fifth chapter analyzes the fixed - point error of bp - based and normalized bp - based decoding algorithm , and gives the final simulation results of each decoding algorithm . with the simulation results and the considering the tradeoff between hardware complexity and error performance , some key parameters and finite precision analysis for the hardware implementation of ldpc decoder have been performed 第五章对bp - based和normalizedbp - based算法进行了定点仿真,对ldpc译码器的关键参数、硬件实现中的定点量化与字长精度问题进行了深入的研究,给出了对译码器硬件实现具有参考意义的研究结果。
One approach of fwl controller study is to obtain the optimal realizations of a given fwl controller to minimize the fwl effects . an alternative approach is to design the fwl controller directly according to some given performance index . the backgrounds and a historical view of fwl problems and non - fragile controller design are presented at the beginning of the dissertation 有限字长控制器研究的一个方向是有限字长控制器的实现问题，即对于已经设计好的控制器，得到能最小化有限字长影响的控制器实现；另一个方向是直接设计一个有限字长控制器，使闭环系统能满足一定的性能指标。
