红外与激光工程, 2018, 47 (11): 1122003, 网络出版: 2019-01-10  

自由空间光通信中的CRC-LT编码性能研究

Research on CRC-LT coding performance in free space optical communication
作者单位
重庆理工大学 电气与电子工程学院, 重庆 400054
摘要
LT码是一种无码率的线性分组码, 具有很强的信道适应性和低复杂度。文中提出一种CRC码与LT码级联的编码方案(CRC-LT码), CRC-LT码通过调整译码开销来保证FSO系统的可通率和使LT码在FSO系统中获得的编码增益。通过建立分析模型, 推导出在给定信道条件下的数据恢复率。最后, 利用Gamma-Gamma信道模型进行CRC-LT码的编译码过程仿真, 并给出数据恢复率与信道条件、信噪比和译码开销的关系, 以及FSO系统的误码率。仿真结果表明, CRC-LT码在牺牲一定译码开销后能够获得更高的编码增益, 有效保证FSO系统的可通率。
Abstract
Luby transform (LT) code is a rateless linear code, which has good channel adaptability and low complexity. A concatenated coding scheme of CRC code and LT code (CRC-LT code) was proposed to ensure the reliability of FSO system and improve the coding gain of LT code in FSO system by adjusting overhead. A new analytic model was developed to derive the data restoration probability with given conditions of channel. Finally, simulation experiments were performed over Gamma-Gamma channel model, and the relationships among data restoration probability, channel condition, SNR and overhead were given. The results show that CRC-LT code has better coding gain and can effectively enhance the reliability of the FSO system by increasing overhead.

曹阳, 任发韬, 彭小峰, 张勋, 陈果. 自由空间光通信中的CRC-LT编码性能研究[J]. 红外与激光工程, 2018, 47(11): 1122003. Cao Yang, Ren Fatao, Peng Xiaofeng, Zhang Xun, Chen Guo. Research on CRC-LT coding performance in free space optical communication[J]. Infrared and Laser Engineering, 2018, 47(11): 1122003.

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