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广义沃尔什函数的构造与生成 总被引:2,自引:2,他引:0
本文对沃尔什函数的对称复制和平移复制概念进行了推广,提出了用循环右移复制和广义平移复制方式来构造或产生广义沃尔什函数(Chrestenson函数)的方法 相似文献
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本文在进一步探讨广义沃尔什函数构造特点的基础上,提出了广义沃尔什函数的复制理论,然后利用复制理论导出了不同编序广义沃尔什函数用广义拉德梅克函数连乘表示的统一定义式。最后,将广义沃尔什函数的复制生成方式与方块脉冲函数的移位方式相结合,构造了一类更为广泛的多值正交函数系,称之为广义桥函数,文义沃尔什函数,沃特利函数等都是它的一个子集。 相似文献
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本文在进一步探讨广义沃尔什函数构造特点的基础上,提出了广义沃尔什函数的复制理论。然后利用复制理论导出了不同编序广义沃尔什函数用广义拉德梅克函数连乘表示的统一定义式,最后,将广义沃尔什函数的复制生成方式与方块脉冲函数的移位方式相结合,构造了一类更为广泛的多值正交函数系,称之为广义桥函数,广义沃尔什函数、沃特利函数等都是它的一个子集。 相似文献
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本文给出了四种桥函数的数学表达式及其证明,指出沃尔什函数系、方块脉冲函数系、哈尔函数系、赫尔函数系、特尔函数系都是桥函数系的一部分。 相似文献
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本文简要说明了付里叶分析的特点,指出其在通信领域中,在理论上和应用上存在不足之处,对付里叶分析范围的优化和正弦组合模型的自相关矩阵特征分析作了介绍,并以特征分解的几种改进的谱估计法以及使用沃尔什函数的效果进行了探讨。 相似文献
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基于GPU的快速二维沃尔什变换研究 总被引:1,自引:1,他引:1
提出了一种基于GPU(Graphics Processing Unit,图形处理器)CUDA(Compute Unified Device Architecture,计算统一设备架构)平台的快速二维沃尔什变换(Walsh Transform)实现方法.该方法利用GPU的并行结构和硬件特点,从算法实现、存储类型、逻辑构架设置等方面提高了沃尔什变换的运算速度.实验结果表明,随着图像分辨率的增加,沃尔什变换在GPU上运行时间远低于CPU,GPU比CPU具有更明显的加速效果. 相似文献
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针对Walsh函数序列生成过程中的正交误差问题,选择利用复制理论产生Walsh序列,在Walsh序列生成过程中建立保证各路Walsh序列延时时间相等的仿真模型。模型建立原理是每个触发器产生每路Walsh序列信号,并将触发器设置成同步工作从而实现最小正交误差。对整个设计过程用Verilog HDL数字描述语言进行编程,并在Quartus II平台进行后仿真,后仿真结果和理论分析相一致,最后在FPGA上实现,为工程应用提供多位Walsh正交序列的生成。 相似文献
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研究了利用80C196MC单片机的波形发生器和一定的外围电路产生单极性SPWM(正弦脉宽调制)信号的方法。利用IR2130驱动器作为栅极驱动器,驱动用IGBT(绝缘栅双极晶体管)组成的单相H桥。对比了单极性SPWM相对于双极性SPWM的优点,阐述了其实现的基本原理,给出了具体的主电路和控制电路及程序实现的流程,分析了IR2130应用中的具体问题,最后给出了一种简单的减小过零点失真的方法。 相似文献
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Zhi-Hong Guan Fangjun Huang Wenjie Guan 《Circuits, Systems, and Signal Processing》2005,24(5):549-555
In this paper, a general key stream generator based on discrete chaotic maps is
presented. The new design of generator is to divide the attractor of a chaotic system into
equal subregions, which are associated with 0 or 1 dynamically. The analysis and experimental
results demonstrate that it is an efficient way to generate key streams with desired
long cycle length. Moreover, the generated key streams have good statistical properties
such as the uniform distribution, δ-like auto-correlation function, and near-zero crosscorrelation
function, etc. 相似文献
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Logistic nonlinear chaotic system has many good characters such as initial value sensitivity and topological mixing in the some parameter condition,which is used to create the random sequence signal generator.Because of the attributions of randomness and uniqueness even under the exact,the same circuit layouts and manufacturing procedures,there is still an instinct unclonable difference in each integrated circuit.Therefore,a new sequence stream generator was proposed based on Logistic chaotic system and physical unclonable function designed by double output look-up-table (LUT).The output of the Logistic sequence generator was associated with a specific physical circuit.This kind of sequence generator could resist an attack such as the replication of the keys of the system.The system was designed and tested on the Xilinx FPGA board.The results show that the same architecture of the circuit and the same config file operated on the different FPGA developing board can generate the total different random chaotic sequence stream and improve the randomness of the stream. 相似文献
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To develop a sequency-division multiplex system for telemetry at the Beijing Institute of Aeronautics and Astronautics, it was necessary to design a Walsh function generator that produces ?almost pure? Walsh functions, just as a generator for almost pure sinusoidal functions is needed for frequency-division multiplex system. In this paper, a symbol function s(n, t) is discussed, and the dyadic increment d(k, t) of the Gray code is defined. The relation between s(n, t) and d(h, t) is deduced. A method for the design of a Walsh function generator based on the symbol function s(n, t) is presented. This method has been used to design a Walsh function generator with order number up to n = 64. 相似文献