Description: 数字控制振荡器（NCO，numerical controlled oscillator）是软件无线电、直接数据频
率合成器（DDS，Direct digital synthesizer）、快速傅立叶变换（FFT，Fast Fourier Transform）
等的重要组成部分，同时也是决定其性能的主要因素之一，随着芯片集成度的提高、在信号
处理、数字通信领域、调制解调、变频调速、制导控制、电力电子等方面得到越来越广泛的
应用。-Digital controlled oscillator (NCO, numerical controlled oscillator) is a software-defined radio, direct data on the frequency synthesizer (DDS, Direct digital synthesizer), Fast Fourier Transform (FFT, Fast Fourier Transform), such as an important component of the decision at the same time the performance of one of the main factors, along with the improvement of the chip integrated in the signal processing, digital communications, modulation and demodulation, frequency conversion speed control, guidance control, such as power electronics get more and more widely. Platform: |
Size: 4096 |
Author:司令 |
Hits:
Description: 用Cordic算法实现的atan函数，可以在通信中完成解调的鉴相功能。-Cordic algorithm using the atan function can be completed in the communication phase demodulation functions. Platform: |
Size: 1024 |
Author:黄嘎 |
Hits:
Description: 用verilog语言实现计算反正切函数，在软件无线电中解调PM/FM中使用的尤为频繁。上传的压缩包是modelsim工程，基于6.5c,里边包含一个完整的PM波产生以及解调过程的matlab文件仿真，并取其中间的I和Q支路做为verilog文件的输入，并将其借条输出与MATLAB实际解调输出作比较。
鉴相器的设计基于CORDIC算法，其精度取决于迭代的深度。由于工程实际运用只需要解调出atan值，并不需要绝对的值，所以并没有给予加权，需要的同学可以自己加上。-Calculated using verilog language arc tangent function, the software radio demodulation PM/FM is particularly used frequently. From the archive is modelsim project, based on 6.5c, inside the PM contains a complete demodulation process of wave generation and simulation matlab file, and whichever is the middle of the I and Q branch verilog file as input, and its IOU demodulated output and actual output of MATLAB for comparison. Phase detector design is based on CORDIC algorithm, its accuracy depends on the iteration depth. As the practical application of engineering demodulated atan value only and does not need absolute value, and there is no weight given to the need of the students can add their own. Platform: |
Size: 79872 |
Author:Jorge |
Hits:
Description: altera cordic ip core, 包含文档，完整设计，以及测试向量-altera coedic ip core, including the document, whole design, and the testbench. Platform: |
Size: 896000 |
Author:panzhijian |
Hits:
Description: 用于无线通信中的数字下变频，主要关注NCO设计还有使用cordic算法实现坐标变换和解调！-For wireless communication of digital down conversion, the main concern there NCO design algorithm using cordic coordinate transformation and demodulation! Platform: |
Size: 2469888 |
Author:peter |
Hits:
Description: CFFT is a radix-4 fast Fourier transform (FFT) core with configurable data width and
a configurable number of sample points in the FFT.
Twiddle factors are implemented using the CORDIC algorithm, causing the gain of the
CFFT core to be different from the standard FFT algorithm. This variation in gain
is not important for orthogonal frequency division modulation (OFDM) and demodulation.
The gain can be corrected, to that of a conventional FFT, by applying a constant
multiplying factor.
Platform: |
Size: 183296 |
Author:Nagendran |
Hits:
Description: 利用Altera公司推出的FPGA开发工具DSP Builder，对锁相解调算法中的主要部件：数控振荡器(NCO)、计算反正切的CORDIC模块和FIR低通滤波器进行了单独设计和仿真，最终完成了锁相解调系统的整体设计。-Designed and simulated major components of phase-locking Demodulation Algorithm independently, including: Number Controlled Oscillator(NCO)、CORDIC module used to compute the arc tangent and FIR low-pass filter by using Altera’s FPGA development tool DSP Builder. Completed the overall design of phase-locked demodulation system. Platform: |
Size: 2209792 |
Author:张强 |
Hits:
Description: CFFT是一个数据宽度和点数都可配置的基4 FFT core，由于旋转因子是用CORDIC算法实现的，因此经过FFT后信号的增益和标准的FFT算法不同。但对于OFDM调制、解调等应用并不重要。由于增益是确定的，因此在输出时乘以确定常数即可等价标准的FFT。该FFT core的输入是正序的，输出是按照基4反序的-CFFT is a data width and number can be configured based 4 FFT core, due to the rotation factor is realized with CORDIC algorithm, so after FFT algorithm gain and standard signal after the FFT different. But is not essential for OFDM modulation, demodulation and other applications. The gain is determined, constant can be determined by multiplying the equivalent standard FFT so on output. The FFT core input is positive, the output is in accordance with the base 4 in reverse order Platform: |
Size: 218112 |
Author:阳辉 |
Hits:
Description: Includes the modulation, demodulation, signal to noise ratio calculation, cordic matlab simulation algorithm, Modern signal processing used in the spectral estimation in matlab. Platform: |
Size: 4096 |
Author:faimunqeifen
|
Hits:
Search - cordic demodulation