这是一个相对完整的OFDM通信系统的仿真设计，包括编码，调制，IFFT，上下变频，高斯信道建模，FFT，PAPR抑制，各种同步，解调和解码等模块，并统括系统性能的仿真验证了系统设计的可靠性 -This is a relatively complete simulation of OFDM communication system design, including coding, modulation, IFFT, the upper and lower frequency, Gaussia

QPSK平方律定时同步算法实现定时误差和定时恢复-QPSK square timing synchronization algorithm ，estimate timing error and timing error correction

QPSK调制后进行载波同步，对频偏进行修正，锁定频率。最后误差波形收敛-After QPSK modulation carrier synchronization, frequency offset correction, locking frequency. The last error waveform convergence