S_D卡的读写程序,c语言编写,全部调试通过,注释很详细-S_D card reading and writing procedures, c language, all debugging through, in great detail Notes

SDES 的加密,SDES encryption

基于C51单片机写入，读取SD卡代码，同时可以实现MMc读取。-C51 microcontroller to write code to read the SD card, MMC can be read.

程序是在不同信噪比情况下两跳协作通信系统分别采用AAF和DAF协议时接收端的误码率仿真主函数twohop.m以及一些子函数,假设信道时瑞利信道。S_R\R_D\S_D的传输距离是1米，调制方式是BPSK，信噪比在-15dB-15dB,接收端合并方式为ERC,迭代次数为1000(The program simulates the BER of the main function twohop. m and some sub-functions at the receiver when the tw

信道为瑞利信道，S_D的距离为1米，三跳协作通信系统中S_R、R1_R1、S_D的距离均为1/3米。调制方式为BPSK,信噪比在-15dB-15dB间，接收端合并方式为ERC,迭代次数为1000(The channel is Rayleigh channel, the distance of S_D is 1 m, and the distance of S_R, R1, S_D in three-hop cooperative communication system is 1/3 M. Th