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Description: 基于tms320vc55*系列DSP常用算法，包括：
1. Experiment 7A - Radix-2 Complex FFT in C
2. Experiment 7B - Radix-2 Complex FFT in C55x Assembly Language
3. Experiment 7C - Radix-2 Complex FFT and IFFT
4. Experiment 7C - Fast Convolution
5. matlab 源码- Based on tms320vc55* series DSP commonly used algorithm,
including: 1. Experiment 7A- Radix-2 Complex FFT in C
2. Experiment 7B- Radix-2 Complex FFT in C55x Assembly
Language
3. Experiment 7C- Radix-2 Complex FFT and IFFT
4. Experiment 7C- Fast Convolution
5. matlab source code
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Description: 于傅里叶变换的图像加密技术研究
具体是将一幅图像用 fft 变换到频域
在频域中进行加密 我考虑的是通过随机相位来加密的方法，请问用matlab怎样实现
加密后在通过 ifft 得到加密后的图象
-Fourier transform in the image encryption technology to study the details of an image is to use fft transformed to the frequency domain in the frequency domain I consider encryption is through random-phase approach to encryption, Will the use of Matlab how to achieve the adoption of encryption ifft be encrypted images
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Author: 李建成 |
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Description:
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Author: Laura |
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Description: 自己编写的matlab中的逆FFT变换，可以用于交流学习-I have written in matlab inverse FFT transform, can be used for the exchange of learning
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Description: 这是一个IFFT数字信号处理程序的MATLAB仿真代码，希望可以为新手提供参考-This is a digital signal processing IFFT procedure MATLAB simulation code, hope that we can provide a reference for the novice
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Description: 本人写的基于冈萨雷斯的图像处理中的快速傅里叶变换和逆变换，数据已经和matlab对比过，完全正确。时间仓促，望大家指正。-I write Gonzalez-based image processing in the fast Fourier transform and inverse transform, the data have been compared and matlab, entirely correct. A rush, hope everyone correction.
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Author: Ma xianzhe |
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Description: WLAN仿真－发送机
wlan No Comments
设置完系统参数后，开始产生发送数据。
1. 产生随机的发送bit（tx_bits），这里不考虑信道编码。
2. QAM映射
3. 将数据映射到不同载波，形成OFDM符号
4. 产生pilot，并将pilot插入OFDM符号中
5. 加入dc和guard子载波
6. 进行ifft，将频域信号变到时域，并加入循环前缀
7. 对信号进行overlap window
8. 在时域产生short preamble
9. 在时域产生long preamble
10. 将preamble和数据符号组成packet
11. 升采样
得到信道传输的数据Tx_signal_up
具体程序见附件 wlan_transmitter.m-WLAN Simulation- wlan No Comments transmitter system parameters set finished, the beginning to have to send data. 1. Have sent random bit (tx_bits), here does not consider channel coding. 2. QAM mapping 3. The data is mapped to a different carrier to form OFDM symbols 4. Have a pilot, and pilot inserted OFDM symbols 5. Adding dc and guard subcarriers 6. To carry out ifft, will change the frequency domain signal to time domain, and add cyclic prefix 7. the signals overlap window8. In the time domain have a short preamble9. In the time domain have a long preamble10. the preamble and data symbols packet11. or sampling received data transmission channel Tx_signal_up specific procedures see Annex wlan_transmitter.m
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Author: 福东方 |
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Description: 1．用Matlab产生正弦波,矩形波,以及白噪声信号，并显示各自时域波形图
2．进行FFT变换，显示各自频谱图，其中采样率，频率、数据长度自选
3．做出上述三种信号的均方根图谱,功率图谱,以及对数均方根图谱
4．用IFFT傅立叶反变换恢复信号，并显示恢复的正弦信号时域波形图
-1. Using Matlab generated sine wave, rectangular wave, as well as the white noise signal, and display their respective time-domain waveform of Figure 2. FFT to transform, showing their frequency spectrum, including sampling rate, frequency, data length of 3-on-demand. Made of the three signals in root-mean-square maps, power maps, as well as the number of root-mean-square map 4. Fourier Transform IFFT with the restoration of signals, and displays the sinusoidal signal the resumption of time-domain waveform
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Author: 白杨 |
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Description: 摘要:为了提高图像复原算法的性能 ,提出了一种改进的奇异值分解法估计图像的点扩散函数。从图像的退化离散模型
出发 ,对图像进行逐层分块奇异值分解 ,并自动选取奇异值重组阶数以减少噪声对估计的影响。利用理想图像奇异值向
量平均能谱指数模型 ,估计点扩散函数奇异值向量的频谱 ,再反傅里叶变换得到其时域结果。实验结果表明 ,该方法能
在不同信噪比情况下估计成像系统的点扩散函数 ,估计结果比原有估计方法有所提高 ,有望为图像复原算法的预处理提
供一种有效的手段。-Abstract : To improve the performance of image restoration algorithms , a modified Singular Value De2
[ ] [ ]
composition SVD method was proposed to estimate the Point Spread Function PSF of an imaging
system. Using the discrete image degradation model , a block2based SVD filter scheme was applied for
the image denoising with an automatically determined singular value rank. After the spectra of PSF
singular vectors were estimated under an exponential model for the averaged spectra of un2degraded
image singular vectors , the IFFT was used to get the time2domain estimation of the PSF. The experi2
mental results show that this proposed method can be applied to estimate the PSF of the imaging sys2
tem under a wide SNR range and its performance is better than the original method. It may be used as
an effective method for the image preprocessing in image restoration problems.
[ ]
Key words: image restoration Point Spread Function PSF block2based Singular Value Decomposi2
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Author: zy |
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Description: 还在为“基于MATLAB的OFDM系统仿真”的朋友，可以看看我总结的资料！
该代码通过综合了本站中的两个源代码，在MATLAB 7.0下完成OFDM系统的完美仿真：音频数据采集->S/P转换->16QAM映射->IFFT处理->添加CP->P/S->理想/多径信道传送->……（FFT等）->传输结果比较（前后频谱图、可以直接通过听前后的音频文件来辨别系统的好坏-理想信道时音质前后相同）。在此还要感谢那两位站员提供相关的代码，也希望能对其他人有帮助。更希望本站能吸引更多的编程爱好者再创佳绩。-KEYWORD:OFDM MATLAB 7.0 CP IFFT FFT P/S S/P
Also for the " Based on MATLAB simulation of the OFDM system," a friend, you can see my summary of the information! The code through a combination of the two site source code, MATLAB 7.0 at complete perfection OFDM system simulation: Audio Data Acquisition-> S/P conversion-> 16QAM mapping-> IFFT processing-> Add CP-> P/S-> ideal/multi-path channel transmission-> ... ... (FFT, etc.)-> transmission results (before and after the frequency spectrum can be directly before and after listening to audio files to identify the system good or bad- when the ideal channel before and after the same sound quality). This would also like to thank at the two stations to provide the relevant code, also hope to have helped others. I also hope to attract more site programming enthusiasts new heights.
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Author: sunshinepwf |
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Description: matlab实现ofdm完整系统，包括qpsk调制，串并变换，ifft，同步等-ofdm in matlab
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Author: 易水寒 |
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Description: MATLAB实现的无源RC、LC滤波器设计系统。可设计LP、HP、BP、BS四种滤波器，附带设计结果-MATLAB realization of passive RC, LC filter design system. Can be designed LP, HP, BP, BS in four filters, with the design results
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Author: wangzhen |
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Description: FFT/IFFT algorithm applications in Matlab
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Author: pitchblue |
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Description: 自行编写实现FFT、IFFT算法，完成OFDM系统的发、收端仿真-FFT，IFFT,OFDM systen simulation
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Author: miffymiffy |
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Description: 这是一个基于空时分组编码的MIMO_OFDM通信系统的仿真设计,此系统包括QPSK调制解调，IFFT调制，空时编解码，基于训
练符号的信道估计等通信模块。
-This is a space-time block coding based on the MIMO_OFDM communication system simulation design, this system consists of QPSK modulation and demodulation, IFFT modulation, space-time coding and decoding, symbol-based channel estimation training and other communication module.
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Author: 邓昌文 |
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Description: 本代码是关于多天线技术空时块编码的通信系统仿真源程序，其中包括QPSK调制，QPSK解调，FFT,IFFT，STBC等模块,并给出误码率计算和性能仿真图。-The code is on the multi-antenna space-time block coding techniques of communication system simulation source code, including QPSK modulation, QPSK demodulation, FFT, IFFT, STBC and other modules, and gives the bit error rate and performance simulation map.
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Author: songji |
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Description: 四元数matlab代码中的IFFT程序，可以直接用的-Quaternion IFFT in matlab program code can be directly used
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Author: yangyang |
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Description: FFT在matlab中的实践分析，例子为求一个正弦波的频谱图、均方根谱、功率谱、对数谱和进行IFFT的变换。简单易懂，供大家参考-FFT analysis of the practice in matlab, examples for the sake of a sine wave of frequency spectrum, the rms spectrum, power spectrum, and the IFFT on the number of spectral transformation
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Author: andy |
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Description: 2D FFT and 2D IFFT in matlab. inputs are original data and block size. ex) block size = [8 8]
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Author: nishina |
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Description: 图像处理的一些基本变换，FFT,IFFT,DCT,IDCT，小波变换，哈夫曼编码等的MATLAB程序代码。-Some basic image processing transform, FFT, IFFT, DCT, IDCT, wavelet transform, Huffman coding MATLAB program code.
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Author: Hopre |
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