【摘要】 本文介绍了流星余迹信道及其特点、信道编码技术在流星余迹通信系统中的应用。通过分析说明低密度校验(LDPC)码在流星余迹通信系统中的应用,提出了LDPC码应用的几个原则。研究表明,在发射功率(信噪比)有限的情况下,流星余迹通信系统可以利用LDPC码的同时纠错、检错特性,使系统达到高的正确接收率。最后针对流星突发信道的信道参数变化的特点,设计了非规则的短长LPDC码,可以得到比规则LDPC码更加优越的性能。更多还原

【Abstract】 This paper introduces some characteristics of the meteor trail communication (meteor burst communication), mainly describes the channel coding used in the MBC system. The utility of LDPC codes in the system is analyzed and described in detail, some criterion of the utility are presented. It is proven that when the SNR is small, the use of LDPC codes in MBC system can improve the system performance for both the correcting ability and detecting ability of the LDPC codes. Based on the SNR time-varying property of the MBC channel, the irregular short-length LDPC codes are proposed and better performance is obtained.更多还原