级联编码在地空数据链信道编码中的应用研究

摘要

为了克服传统信道编码方式的缺点,提高地空数据链信道传输的可靠性和传输效率,同时降低信道编码的复杂度,采用了级联编码的方法,将重复累加码与喷泉码进行级联后,应用到地空通信数据链信道编码当中.首先阐述了重复累加码、喷泉码的基本原理和编解码方法,重点介绍了两种码的级联方法,并通过实验进行了论证和比较,实验证明,通过级联方式编码后,数据链信道的误帧率明显降低,通信效果得到明显改善.研究结果表明,级联编码方法不仅能充分发挥喷泉码的特点,而且无线数据传输的可靠性得到明显改善.%In order to overcome the traditional shortcomings of the channel coding and improve the transmission reliability and efficiency of ground-air data link channel while reducing the complexity of channel coding, the method of concatenate encoding was applied in the ground-air data link channel coding. First, the basic principles and methods of encoding and decoding for the repeat accumulate codes and fountain codes were described. Then, the concatenating methods for two kinds of code were introduced, which were demonstrated by experiments. The experiments showed that, through the concatenated encoding, the frame error rate of data link channel was reduced significantly, and the communication effect was improved greatly. The result of study shows that the concatenate encoding method can not only give full play to the characteristics of fountain codes, but also improve the reliability of wireless data transmission significantly.