大气激光通信自适应系统中LDPC的识别

发布时间：2018-01-22 17:55

本文关键词： 大气激光通信低密度奇偶校验码(LDPC) 自适应编码调制(AMC) 识别　出处：《光电子·激光》2016年06期 　论文类型：期刊论文

【摘要】：从大气激光通信信道模型出发,结合大气激光通信特殊的调制方式,利用接收解调软判决序列的后验概率信息,导出大气激光通信自适应系统中低密度奇偶校验码(LDPC)的识别算法公式。仿真结果表明,当识别正确率为0.8时,在强湍流条件下,算法公式比传统算法性能提高约1.2dB;在弱湍流条件下,算法公式比传统算法性能提高约1.5dB;并且随着码率的降低和码长的增加,识别成功率均有提高。因此,所提算法公式能够进一步抑制大气湍流影响,提高系统性能。
[Abstract]:Based on the atmospheric laser communication channel model and combined with the special modulation mode of atmospheric laser communication, the posteriori probability information of the received demodulation soft decision sequence is used. The algorithm formula of low density parity check code (LDPC) in atmospheric laser communication adaptive system is derived. The simulation results show that when the recognition accuracy is 0.8, under the condition of strong turbulence. The performance of the algorithm is about 1.2 dB higher than that of the traditional algorithm. Under the condition of weak turbulence, the performance of the algorithm is about 1.5 dB higher than that of the traditional algorithm. With the decrease of code rate and the increase of code length, the recognition success rate is improved. Therefore, the proposed algorithm can further suppress the atmospheric turbulence and improve the performance of the system.
【作者单位】：电子工程学院脉冲功率激光技术国家重点实验室;
【基金】：安徽省自然科学基金(1308085MF83,1408085MF120)资助项目
【分类号】：TN929.1
【正文快照】： 1引言大气激光通信是伴随大功率半导体激光器和高灵敏度光电探测元件的发展而兴起的一种通信方式,具有通信容量大、传输速率高、隐蔽性高和抗干扰能力强等优点。然而,大气衰减效应和大气湍流效应是限制通信距离和性能的瓶颈所在[1,2]。为了抵抗衰减效应和大气湍流,低密度奇偶

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