QFSK的调制与解调，用C写的主程序，汇编写的调制与解调的子程序-QFSK the modulation and demodulation, with the main program in C, compile writing, the modulation and demodulation of the Subprogram

OFDM技术关键实现的C代码，包括FFT、QPSK、星座变换等。-The OFDM technology critical to achieve the C code, including FFT, QPSK, Constellation transform.