旋转因子

旋转因子合并的频率抽取FFT算法&RCFA的新解释

Twiddle factor merged frequency-decimal FFT algorithm & a new explanation for RCFA

可变长FFT并行旋转因子高效产生算法及实现

Effective algorithm of parallel twiddle factor generation for programmable FFT processing and its implementation

FFT旋转因子生成算法研究

Research of Rotating Factor Resulting Algorithm of FFT

在不同的衰落信道条件下用MATLAB进行仿真，结果验证了加入旋转因子可以降低误码率。

In the conditions of different fading channel , simulated with the MATLAB simulation results verify the inclusion that rotation scheme factor can reduce the error rate .

一种简单PTS旋转因子优选方法降低OFDM数字广播系统的PAPR

A Simple Selecting Method of PTS Phase Factor for the Reduction of PAPR in OFDM Digital Broadcasting System

内置双端口RAM、旋转因子ROM使数据存储的速度得到提高；

In addition , dual-RAM and twiddling-factor ROM are built inside the system to enhance the speed of data transformation .

对频率抽取FFT算法进行修改，将两级旋转因子进行合并，得到旋转因子合并的频率抽取FFT算法。

Merging the widdle factors in two neighbouring stages for frequency-decimal FFT algorithm , we can obtain the twiddle factor merged frequency-decimal FFT algorithm .

旋转因子采用1/8域表示，提高旋转因子的利用率，减少ROM的使用。

Twiddle factors are expressed by 1 / 8 domain , so factor utilization increases and ROM area is reduced .

本文概述了快速Fourier变换（FFT）的基本方法，着重讨论了高合成数FFT旋转因子算法。

In this paper some fundamental methods of fast Fourier transform ( FFT ) are mentioned with a highly composite twiddle factor FFT : algorithm discussed in particular .

FFT中旋转因子的正、余弦函数值计算方法有两种，一是直接产生，二是查表。

There are two kinds of methods of the sin cos value calculating method of revolving factor , one is directing calculating , another is inquiring table .

与传统的流水线FFT比较，该模块中的复数乘法运算全部采用移位相加操作完成，因而消除了乘法器及旋转因子ROM的使用，降低了功耗。

In comparison with traditional pipeline FFT , the complex multiplication was implemented by shifting and addition operations in order to eliminate multiplication unit and coefficient ROM.

进一步地，我们将所提算法扩展成一种带有旋转因子的多路回波消除仿射算法APARF。

Furthermore , it is extend to a multi channel Affine Projection Algorithm with rotating factor ( APA RF ) for stereophonic echo cancellation .

详细介绍了蝶形器的设计、地址产生、独立双端口存储器设计、复数乘法器的设计和旋转因子的MATLAB软件生成。第四，在概要设计的基础上，对图像生成模块进行了详细的设计。

Butterfly design , address , independent dual-port memory design , the design of the complex multiplier and twiddle factor MATLAB software generation . Fourth , on the basis of the outline design , image generation module detailed design .

该算法便于流水处理，只有一次简单的数据通讯，而且旋转因子规律简单易于将大点数FFT拆分成小点数FFT。

It is easy to implement this algorithm on pipeline processors and to divide an N-point FFT for a large N into some short ones because of an easy way to rotate the factors .

处理器采用10级流水线结构，每级将乘法器的旋转因子输入端固定为常数，以进一步提高处理器的速度，而中间结果则以双端口RAM存储。

The processor has 10-stage pipeline structure and the input port of rotating factor in every stage is fixed to improve the rate of processor . Its medium result was stored in dual-port RAM .

本文提出一种带有旋转因子的归一化多路回波消除算法NLMSRF，并对算法进行了分析和几何解释。

A Normal Least Mean Square adaptive filtering algorithm with rotating factor ( NLMS RF ) is proposed and its performance and geometry property is analyzed in this paper .

传统FFT算法中蝶形运算单元是通过复数乘法器和加法器实现的，由于乘法逻辑的复杂性，制约了FFT的计算速度，同时旋转因子的存储也占用较多资源。

The Butterfly-Operation units in the conventional FFT are composed of imaginary multipliers and adders . The speed of FFT is constrainted by the complexity of multipliers . Moreover the twiddle factors take up many resources .

供氧系统爆炸减压动态特性地面实验方法研究利用地面实验数据，以最小二乘法解算该数学模型，求出焦距、CCD平面倾斜和旋转因子及畸变因子等待标定参数。

Based on the ground experimental data , the mathematical model is solved by least square method , the calibration parameters such as focal length , plane tilt and rotating factors of CCD and distortion factors etc can be obtained .

文中参考一种特殊的FFT算法，采用相位旋转因子代替乘法器并给出16点FFT算法在低成本FPGA的实现。

In this paper , based on a special 16-point FFT algorithm , an implementation method suitable for low cost FPGA chipsets is presented . In this method , rotators are composed of only shifters and adders and can take the place of multipliers .

推导出计算正序输入DIF基4Sande&TukeeFFT算法旋转因子指数公因子p的一种简单方法.给出大幅度减少该算法处理程序运算量的几项有效措施。

A simple method for evaluating the common factor p of the twiddle factor indexes in the correct order input DIF radix-four Sande-Tukey FFT algorithm is derived from in the paper . And some effective measures for reducing largely the operation quantity of the processing program are given .

电力系统仿真中的旋转因子法及其应用

Rotation factor method and its applications in the digital simulations of power systems

采用旋转因子法的同步电机模型

Digital simulations of synchronous machines using rotation factor method

带有旋转因子的多路回波消除自适应滤波算法

A Adaptive Filtering Algorithm with Rotating Factor for Multi - Channel Echo Cancellation

旋转因子快速傅里叶变换算法

Twiddle factor FFT algorithm

这个旋转因子产生电路用若干逻辑模块来产生数据，然后用这些数据合成所需要的旋转因子。

It consists of several simple logic units and each of them synthesizes some data , which will be used to compose the twiddle factors .

本文应用旋转因子a~m及导纳或阻抗的形式给出了对称线电压下，满足三相三线负载电压或电流对称条件的三个方程。

Three equations for satisfying symmetrical condition of voltage or current of threephase three-wire load in the form of rotating factor am and admittance or impedance are introduced .

最后，利用旋转因子分析方法，对年代际及年际尺度因子的潜在结构对长江中下游夏季降水的影响进行了研究。

In addition , the effect of the potential structure of factors with interdecadal scale and interannual scale on the precipitation anomaly is analyzed by the rotated principal component analysis .

利用傅立叶变换加权旋转因子的移动，使信号频谱移动量抵消舰速引起的多普勒频率偏移量来实现舰速补偿。

The velocity compensation was realized by using the shift character of Fourier Transform that moves the signal spectrum to the travel motion of signal spectrum was counteracted by offset mount of Doppler frequency .

在对调查问卷用因子分析法进行数据分析时，根据旋转因子负荷矩阵数值把服务质量评价量表中的项目指标进行精简，最终得出包含25个项目指标的温泉度假村服务质量评价量表。

In using factor analysis of data analysis for the questionnaire , the indicators is purified , and finally constructed a hot spring resort service quality measurement scale of eight dimensions and 25 indicators .

阵列流形可以被划分为几个子阵阵列流形，子阵之间的旋转因子与目标信号的方向余弦有关，而与阵元的间距无关。

The array manifold may be divided into several subarray manifolds , which are related by invariant factors and depend on the source ′ s direction cosines but not on the vector hydrophones ′ spatial locations .