Implement of signal transmitter for OFDM in underwater acoustic communication based on DDWS

OFDM (orthogonal frequency division multiplexing) is an attractive method for communication in the world. According to the requirements of signal transmission for OFDM in underwater acoustic communication, the signal transmitter for OFDM with FPGA (field programmable gate array) used as logical control unit is designed and implemented. And the method of interrupt of DMA (direct memory access) is used to transmit the data between DSP (digital signal processor) and FIFO (first in first out) with high speed. DDWS (direct digital wave synthesis) is adopted to realize producing OFDM signal. From the results, we can see that the transmitter has good steady and can complete the signal transmission in real time.