基于TI64X DSP的DVB-T基带发送系统实现

摘要

This paper illustrates the method of the implementation of DVB -T baseband transmitter system based on 64X DSP. Firstly, proposed a Dwords outer coding algorithm using DSP particular instructions to shorten the coding time,put forward a multiple cache hardware processor architecture with analyzing the principal of outer leaving detailedly, achieved a new method to implement convolution code of different rates by using its state encoding characteristic, proposed a inner leaving architecture based on symbols to overcome the drawback of long time based on blocks, and looked up the table to insert the pilot carriers. Then,send the IFFT baseband datas after inserting cycle prefix out. The experiment shows the validity of the proposed algorithms.%详细地阐述了利用64X DSP实现DVB-T基带发送系统的方法.首先,利用DSP专用指令设计了一种实现外编码的双字型算法,极大地缩短了编码时间;分析了外交织的原理,给出了一种新的多级缓冲的交织硬件处理结构;根据卷积编码为状态编码的特点,用查表实现了各种码率的卷积码;分析了块交织耗时太长的缺点,采用了一种基于符号的内交织方法;通过查找表完成导频信息的插入.其次,将离散傅立叶变换的基带数据插入CP后进行数据输出.最后,通过实验结果说明了所提出算法的有效性.