| 摘要: |
| 由于空间激光通信系统的信道状态和链路捕获跟踪的不确定性，多种形式的信道纠错编码技术正被广泛发展研究。结合空间激光通信链路中误码性能的主要影响因素，分别选择合适的编码方案进行分析。通过仿真实验可知，对于在大气结构参数为1.5×10-14 m-2/3、风速为20 m/s的空地激光链路的环境下，在系统数据速率为2 Gbit/s、要求误码率为10-6时，LDPC码结合交织码相对未编码系统有3 dB的等效编码增益，LT码相对未编码系统有3.8 dB的等效编码增益。提供了一种能快速生成、扩展和校验的编码和交织实现方法，以抵抗大气湍流的快速变化对系统性能产生的影响。 |
| 关键词: 空间激光通信 信道纠错编码；交织；编码增益 |
| DOI： |
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| 基金项目:“十三五”航天领域预研专用技术（305060512） |
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| Channel Coding Technology in Space-Based Laser Communication |
| ZHANG Jingang,LUO Yubin,YU Siyuan,GENG Chi |
| (Beijing Institute of Astronautical Systems Engineering;Harbin Institute of Technology) |
| Abstract: |
| Because of the channel state of the space laser communication system and the uncertainty of link capture and tracking, many kinds of channel coding techniques are being studied extensively. In this paper, the main influence factors of error code performance in space laser communication link are considered and appropriate coding schemes are analyzed. The simulation experiment shows that, for the space-ground laser link with atmospheric structure parameters of 1.5×10-14 m-2/3 and wind speed of 20 m/s, when the data rate is 2 Gbit/s and bit error is 10-6, LDPC code combined with interleaved code has an equivalent coding gain of 3dB compared with the uncoded system. LT code has an equivalent coding gain of 3.8 dB compared with the uncoded system. This paper presents a coding implementation method that can generate, expand and verify rapidly to resist the influence of atmospheric turbulence on system performance. |
| Key words: Space laser communication Channel error-correcting code Interleave Coding gain |