The Research And Realization Of Data Modulation Based On DSP

Recently, wireless communication has shown its importance in most of areas in our society, as one of the most developing branches in communication fields. It is now developing fast especially with the appearance of Digital Signal Processing Chip (DSP). In the background of wireless communication, my thesis focuses on the system of data modulation based on DSP and realized it at last.During the process of designing system, we selected the suitable modulation and coding gradually, based on the characteristic of shortwave channel and the custom's demand. At the same time, we made the hardware circuit successfully and realization the modulation and demodulation on it. Our design includes:1)In the circumstance of VC++6.0, we programmed the part of software to interface with persons, and performed the task of coding and interweave.2)By the way of the Serial Port or PCI of computer, we performed the data exchange between the computer and circuit board.3)We designed the high speed hardware circuit of DSP, and ensured the DSP working well.4)We programmed on the DSP and realized to functions: the data exchange between DSP and software in computer; the modulation of data received from computer.Our design realized the modulation and transmission of data on DSP finally. Meanwhile the significance of the thesis is that discussed the modulations common used in shortwave channel, and realized on the hardware board. We adopted the general DSP chip to achieve the modulation and data exchange. And while programmed on DSP, we modulated data by the way of Direct Digital Synthesizer (DDS).