quadrature phase shift keying demodulation technique

简单明了的并口 avr isp下载线原理图-straightforward Parallel avr isp downloaded line diagram

描述了qpsk过程，与大家交流，请多多指正-described qpsk process, and the exchange of, and invites further correction

通信史话-communications History INTEREST

前段时间刚刚接触VC的串行通讯，在网上找到的了SerialPort类的使用方法，不过我想将这个类做在DLL中，然后在VB中做通讯界面调用。花了几天时间终于做完了，将SerailPort类的DLL工程共享一下，-Some time ago just contact VC serial communication, the Internet found the use of the SerialPort class, but I would like to do this class in the DLL, and then in the VB to do communication interface call. Spent a few days was finally done, and will SerailPort class DLL project to share what,

Visual C++ 串口通信编程实践 第7章和第8章源码-Visual C++ Serial communication programming practice, Chapter 7 and Chapter 8 Source

将模拟滤波器转变为数字滤波器。-analog filter into digital filter.

这是一个定点的多带OFDM物理层发射机/接收机模型,共122个子载波，22个导频，采用QPSK调制,5/8前向纠错码(删余卷积码.)-This is a sentinel of the multi-band OFDM physical layer transmitter/receiver model, a total of 122 sub-carrier. 22 pilots, using QPSK modulation, 5/8 prior to the error-correcting code (I delete convolutional codes.)

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通过编程计算ＲＳ编码前后通信系统的误码率可以很清楚的看到系统的编码增益．-programmed to calculate RS coding communication systems around the BER can clearly see the coding gain.