cp_fixed

介绍了数字通信中的QPSK调制解调的原理，通过用Matlab编写脚本程序对QPSK通信系统的发射和接收过程的具体实现进行模拟仿真，绘出信号在理想信道和加噪信道中模拟传输时的时域图，并对各模块进行了频谱分析，所得到的结果与理论基本相符，对于理解QPSK系统的性能并在系统的实际应用上作进一步的设计，提供了有效的参考依据(The introduction was done with the principle of the QPSK modulation and demodulation in digital communications, a script was written by using Matlab program to carry out a simulation of the QPSK communication system ,which contains the concrete realization of transmit and receive process. The time-domain diagram is drew separately when the signal transmits in the ideal channel and in the channel with noise, spectral analysis of each module is also done, the results obtained with theoretical results in the main, which provides an effective frame of reference for understanding the performance of QPSK systems, and the practical application in the system to make further designed.)

doppler effect simulation in matlab

维特比译码器，判决方式为软判决，用S-function编写，希望对大家有所帮助。( Viterbi decoding S-function)

simple matlab examples

用MATLAB M语言实现平均电流模式控制的PFC数学模型。运行该程序后可看到电流，电压波形。(Using MATLAB M language to achieve an average current-mode PFC control, mathematical model. After running the program to see current and voltage waveforms. )

使用Matlab编程实现发送端信源编码（图像压缩）和接收端信源解码（图像重建），其中的编解码算法可采用基于DCT变换的JPEG图像压缩标准；测试图像加噪，然后对去噪后的图像进行压缩与重建，分析压缩性能；研究基于下采样和内插的图像压缩算法；可将8bit/pixel灰度图像扩展至24bit/pixel彩色图像，或者采用无损压缩算法对图像压缩。(Sender using the Matlab programming source coding (image compression) and the receiver source decoding (image reconstruction), one of the decoding algorithm can be used DCT-based JPEG image compression standard test image with noise, then the denoised image compression and reconstruction, compression performance analysis of down-sampling and interpolation based on image compression algorithm 8bit/pixel grayscale images can be extended to 24bit/pixel color images, or the use of lossless compression algorithms for image compression. )

节点分层计算配电网潮流，内有实际算例分析，已编译通过(Hierarchical distribution networks and computing nodes, there are practical examples and analysis, compiled by)

基于MATLAB的AR模型的仿真，并分析功率谱，比较好。可以运行(AR model based on MATLAB simulation, and analysis of the power spectrum, the better. You can run)

求一元二次方程ax2 +bx+c=0的根(Find a quadratic equation ax2+ bx+ c = 0 root)

Small tutorial of psim