OFDMQPSK

This is a matlab code sampleFreeNoise

基于fft的匹配追踪算法，且ff与tMATLAB中自带的源程序不尽相同(Fft-based matching pursuit algorithm, and ff the source code comes with tMATLAB in different)

说明：  本文阐述了扩展频谱通信技术的理论基础和实现方法，利用MATLAB 提供的可视化 工具Simulink 建立了扩频通信系统仿真模型，详细讲述了各模块的设计，并指出了仿真建模 中要注意的问题。在给定仿真条件下，运行了仿真程序，得到了预期的仿真结果。同时，利 用建立的仿真系统，研究了扩频增益与输出端信噪比的关系，结果表明，在相同误码率下， 增大扩频增益，可以提高系统输出端的信噪比，从而提高通信系统的抗干扰能力。 (This paper describes the theory of spread-spectrum communication technology and implementation methods based on the use of visualization tools provided by MATLAB Simulink to establish a spread spectrum communication system simulation model, described in detail the design of each module, and pointed out that the simulation modeling to note problem. In the given simulation conditions, running a simulation program to obtain the desired simulation results. Meanwhile, the use of the simulation system to study the spreading gain and the relationship between the output signal to noise ratio, results show that the same bit error rate, increased spreading gain can increase the system output signal to noise ratio, thereby enhancing communication system disturbance.)

ldpc编码，随机生成H矩阵，LLR-BP算法译码，有我详细的注解，非常详尽(ldpc coding, randomly generated H matrix, LLR-BP decoding algorithm, with my detailed notes, very detailed)

matlab与C混合编程的实例，求解两个矩阵的和。(An example of matlab-C mixed programming,getting the adding solution of two matrixes.)

利用matlab軟體實現類神經網路 BAM演算法(Neural network using matlab BAM implementation)

说明：  _应用MATLAB语言处理数字信号与数字图像，做图像处理编程时很实用的的电子书(_ Application of MATLAB language processing digital signals and digital images, so image processing is very useful when programming the e-book)

说明：  一个最新的快速独立分量分析工具箱，很有用(The latest fast independent component analysis toolbox, useful)

说明：  比较了干扰对齐算法中，正交投影与一般算法（经典算法，数值计算的迭代方法）的性能(orthogonal projection algorithm)

butterworth滤波器，可实现高通低通滤波(butterworth filter, low pass filter high-pass)