用C语言实现QPSK调制解调程序代码.能运行的

QPSK的详细设计流程，及仿真图像，是做设计的重要参考。-QPSK the detailed design process, and the simulation images, are doing an important reference for the design.

使用MATLAB仿真pi/4QPSK调制解调比较好的一篇文章，算法易懂，好实现。-Modulation and demodulation using MATLAB simulation pi/4QPSK good article, the algorithm easy to understand, to grasp.

C and MATLAB implementation for LDPC encoding and decoding-Overview of what is provided WiFi (IEEE 802.11n) LDPC code construction Encoding by back-substitution for WiFi LDPC codes Iterative belief propagation (BP) Decoding (including