A system simulation environment in Matlab/Simulink of RFID is constructed in this paper. Special attention is emphasized on the analog/RF circuit.Negative effects are concerned in the system model,such as phase noise of the local oscillator,TX-RX coupling,reflection of the environment, AWGN noise,DC offset,I/Q mismatch,etc.Performance of the whole system can be evaluated by changing the coding method,parameters of building blocks,and operation distance.Finally,some simulation results are presented in this paper.
标签： environment constructed simulation Simulink
上传时间： 2014-01-09
上传用户：zhangliming420
是MATLAB关于c\c++的使用和应用（英文）。
上传时间： 2013-12-16
上传用户：cazjing
通过SPI接口，同RF传输芯片CC2500的通讯代码
上传时间： 2015-11-26
上传用户：youke111
让您通过VB介面，简易地测试8051上面的40Hz的RF通讯。
标签：
上传时间： 2014-01-07
上传用户：gundamwzc
本程序通过系统调用stat读出文件大小属性，并显示输出。 linux文件系统调用 编译命令：cc dir.c 运行命令：./a.out
上传时间： 2015-12-27
上传用户：tzl1975
Carrier-phase synchronization can be approached in a general manner by estimating the multiplicative distortion (MD) to which a baseband received signal in an RF or coherent optical transmission system is subjected. This paper presents a unified modeling and estimation of the MD in finite-alphabet digital communication systems. A simple form of MD is the camer phase exp GO) which has to be estimated and compensated for in a coherent receiver. A more general case with fading must, however, allow for amplitude as well as phase variations of the MD. We assume a state-variable model for the MD and generally obtain a nonlinear estimation problem with additional randomly-varying system parameters such as received signal power, frequency offset, and Doppler spread. An extended Kalman filter is then applied as a near-optimal solution to the adaptive MD and channel parameter estimation problem. Examples are given to show the use and some advantages of this scheme.
标签： synchronization Carrier-phase multiplicativ approached
上传时间： 2013-11-28
上传用户：windwolf2000
学会对文件的记录锁定，及解锁。#include <stdio.h> #include <unistd.h> #include <fcntl.h> int main() { int fd int i struct { char name[20] uint ID int age } myrec fd =open("name", O_RDWR|O_CREAT, 0755) if (fd == -1) return -1 printf("Input your name:") scanf("％s", myrec.name) printf("Inpute your ID :") scanf("％d", &myrec.ID) printf("Input your age :") scanf("％d", &myrec.age) lseek(fd, 0,SEEK_END) lockf(fd, 1, 0) write(fd, (void *)&myrec, sizeof(myrec)) lockf(fd, 0 ,0) return 0 } 执行命令cc lock.c –o lock.out Chmod +x lock.out ./lock.out
标签： 记录
上传时间： 2016-01-04
上传用户：亚亚娟娟123
Nordic 公司 nRF24E1 芯片程序，包含RF,Timer,UART中断，是极好的参考资料
上传时间： 2013-12-27
上传用户：familiarsmile
在这篇文档中，将以C/C++的源码作为我们基础，所以必然涉及一些关于C/C++的编译的知识，相关于这方面的内容，还请各位查看相关的编译器的文档。这里所默认的编译器是UNIX下的GCC和CC。
标签： 文档
上传时间： 2016-01-13
上传用户：chenjjer
数据结构（c\c++)1800例题与答案,值得一看
上传时间： 2014-11-29
上传用户：181992417
