split_step_fiber

Data Encryption by Matrix Multiplication We will only use numbers 0 to 26 for the encryptive mathematics operation. Numbers from 1 to 26 are for letters from A to Z and 0 is for all non-letter characters. To minimize usage of numbers, all letters are converted to upper case. The original message is converted to number array according to the ASCII table and minus 64. We partition whole array into blocks of 8 numbers. The last block may be added several zeros. Then multiply each block by the an 8x8 matrix A which is invertible in Z27 to get cipher data. The decryption is the same process except to use its inverse matrix B. For good visual reading, we convert all non-letter characters to under score for the decryption.

经修改的SSIM代码，在MATLAB环境下运行。不能使用JPG格式的图片。(SSIM revised code, run in the MATLAB environment. You can not use JPG format images.)

使用FFR对各宏小区的用户进行资源分配，在多用户随机分布着各个小区中的情况下，统计中心小区和边缘小区的用户吞吐量。(The resource allocation is performed for the users of each macro cell using the FFR, and the user throughput of the center cell and the edge cell is counted when the multi-user is randomly distributed among the cells.)

DEMODULATOR: This function performs demodulation of the forward Channel packet, based on RAKE Receiver Block Diagram Input Signal -> [Matched Filter] -> [Sampler] -> [RAKE Receiver] -> [Walsh] -> [DeSpreading] Inputs: RxIn - input signal (I/Q) analoge PN - PN sequence (used for De-spreading) MF - matched filter taps Walsh - Used row of Walsh matrix for recovering

通过对二维码的3个顶点定位，扫描从而确定二维码的位置为后续解码做准备(hrough the three vertices of qr code, scan to determine the location of the qr code in preparation for the subsequent decoding )

S-function程序编写实例,本人学习MATLAB中系统函数第一个编写的程序。运行环境：MATLAB。直接运行即可。(the programming example of S-function.)

Parallel active power filter

GSM simulation program

matlab下的3电平VSC系统模型，对于初学者很有帮助，建议大家多多交流，互相帮助(The 3-level VSC system model under matlab is very helpful for beginners. It is recommended that you exchange more and help each other.)

说明：  多目标跟踪，可处理多个目标，但8个以上效果就不行了。(Tracking, can handle multiple targets, but more than 8 results does not.)