sprc090

本论文以OFDM系统为基础，介绍了OFDM系统的基本原理，以及使用OFDM技术的优势所在，并且展望了今后的无线移动技术的发展前景。在简单介绍OFDM原理的同时，着重阐述了OFDM系统在不同信道环境和不不同实现方式下的误码性能。主要包括了OFDM系统在加性白高斯信道，在加性白高斯信道和多径干扰两种不同信道环境下系统的误码性能，其中后者还研究了系统在有保护间隔与无保护间隔的误码性能比较。在理论分析的基础 (This thesis is based on the OFDM system, the basic principle of the OFDM system, as well as the advantages of using OFDM technology, and future prospects for the development of future wireless and mobile technologies. OFDM principle in brief, focusing on the BER performance of OFDM systems under different channel conditions and different implementations. Including OFDM system in additive white Gaussian channel, additive white Gaussian channel and multipath interference of two different channel environment, the system BER performance, the latter of which also studied the system in a protected interval without guard interval BER performance comparison. The basis of theoretical analysis)

cai yong 一个串口拓展成4个串口！(1 uart to 4)

捷宝A188盘点程序，BIN文件，传入即可作用。(A188)

这是一个将24位位图转换为8位位图的算法程序，用 vc++写的内容通俗易懂，注释清晰。(This is a 24-bit bitmap is converted to 8-bit map algorithm, using vc++ to write the content easy to understand, clear notes.)

端口扫描器。 本扫描器实现了：TCP Connect 扫描，TCP SYN扫描，TCP Fin扫描，TCP ACK扫描及UDP端口扫描,这些扫描能够实现扫描特定IP地址范围内端口和扫描某IP地址范围内全部主机特定端口两种模式，并且SYN扫描能够区分端口开放、端口关闭和被防火墙过滤三种状态。(Port scanner. The scanner realized: TCP Connect Scan, TCP SYN Scan, TCP Fin Scan, TCP ACK scan and UDP port scan, the scan can scan a specific IP address range of ports and scanning a range of IP addresses all host two specific ports mode, and can distinguish SYN scan open ports, port closed and the three states firewall filters.)

说明：  用VC++调用STK，完成超强的卫星分析功能和动画运行。(Using VC++ call STK, super satellites to complete analysis and animation to run.)

一个用c++写的ado数据库连接作品 对初学者有一定的参考作用 主要是应用了mfc类库的知识 希望对大家有参考作用(A with c++ to write the ado database connection works for beginners of some reference value is applied knowledge mfc class library reference for all of us hope that the role of)

usb通讯 ,实现与设备的USB通讯连接。直接调用就可以使用，清册可是。(USB COMM you can use is to develop your own app.)

Developing a GUI in C++ and DirectX

智能大厦自动报警系统 access 数据库，功能强大，可供初学者，或者业务相关的人学习(Automatic alarm system of intelligent building access database, powerful, for beginners, or business related people)