OFDM的发射端，包括pi/4DQPSK的调制，ifft，加帧头以及组帧-The OFDM transmitter, including pi/4DQPSK modulation, ifft, plus header and Framing

语音信号的分帧加窗的matlab实现及语音信号处理预加重、加窗分帧matlab程序-Sub-frame window of the speech signal and speech signal processing matlab to achieve pre-emphasis, adding windows framing matlab program

This matlab code is used for framing speech signals in to 30ms duration with 5ms overlap which is the common framing duration in speech processing