基于喷泉码的导航电文编码研究
首发时间:2014-11-05
摘要:喷泉码是一种算法复杂度低、传输效率高、适合于广播信道的无率码。本文提出在卫星导航系统中应用喷泉码作为信道自适应电文编码方式,满足异质用户需求。特别针对导航电文短、部分电文相对固定,异质用户多、信道条件复杂的特点,分别使用鲁棒分布条件下的BP译码算法和伪随机矩阵形式下的BPML译码算法对LT码性能进行分析,发现在短码长,信噪比较差的条件下,喷泉码应用于导航系统可以提高其性能。可为导航系统电文优化设计提供参考。
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Channel Coding Research for Navigation Data Based on Fountain Codes
Abstract:Fountain code is a rateless code with low complexity and high transmission efficiency which is suitable for broadcast channel. This paper proposes a measure in satellite navigation systems based on fountain code as a channel adaptive code to meet the needs of heterogeneous users.The characteristics of navigation data are short, part of the data being relatively fixed,lots of heterogeneous users and complex channel condition.In view of these characteristics,this paper uses belief propagation(BP) decoding algorithm with Robust Soliton distribution and belief propagation maximum likehliood(BPML) decoding algorithm with generator matrix to analyze the performance of LT codes.Simulation result shows that under the condition of short data and low SNR, fountain code can improve the performance if it is applied to navigation systems. This paper provides a solution for the optimizing design of navigation data.
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