改进的T-PPM编码在大气弱湍流下的性能分析
发布时间：2019-05-08 04:42
【摘要】：网格编码调制(TCM)与脉冲幅度调制(PPM)相结合的T-PPM编码具备了双方在纠错能力和发射功率效率方面的优点,在空间光通信中有广阔的应用前景。而传统的T-PPM编码调制技术在映射方面存在缺陷,制约了系统的可靠性。为改善大气湍流光通信系统的误码性能,提出一种适用于单载波弱湍流空间光信道的改进型T-PPM技术。这种方法采用格雷映射取代传统TCM中的"子集划分"映射,降低接收时的误判可能性。仿真结果表明,格雷码映射能显著改善误码性能;在误码率为10-3处,格雷码映射相比子集映射提高了约0.2 dB增益,有效改善系统的差错性能;在1 ps和2 ps展宽量条件下误码率(BER)分别减少至传统方案的约1/2和4/5,从而验证了格雷码映射的优越性。
[Abstract]:The combination of trellis coded modulation (TCM) and pulse amplitude modulation (PPM) T-PPM coding has the advantages of both sides in error correction capability and transmission power efficiency, and has a broad application prospect in space optical communication. However, the traditional T-PPM coding and modulation technology has some shortcomings in mapping, which restricts the reliability of the system. In order to improve the error performance of atmospheric turbulent optical communication system, an improved T-PPM technique is proposed, which is suitable for single carrier weak turbulent spatial optical channels. In this method, Gray map is used to replace the "subset partition" mapping in traditional TCM, which reduces the possibility of misjudgment when receiving. The simulation results show that the lattice code mapping can significantly improve the error performance, and at the bit error rate of 10 ~ 3, the lattice code mapping improves the gain of about 0.2 dB compared with the subset mapping, and the error performance of the system is improved effectively. Under the condition of 1 ps and 2 ps BER, the bit error rate (BER) is reduced to about 1 ~ 2 and 4 ~ 5 of the traditional scheme, respectively, which proves the superiority of Gray code mapping.
【作者单位】： 中国海洋石油总公司;
【分类号】：TN929.12
，
本文编号：2471628
[Abstract]:The combination of trellis coded modulation (TCM) and pulse amplitude modulation (PPM) T-PPM coding has the advantages of both sides in error correction capability and transmission power efficiency, and has a broad application prospect in space optical communication. However, the traditional T-PPM coding and modulation technology has some shortcomings in mapping, which restricts the reliability of the system. In order to improve the error performance of atmospheric turbulent optical communication system, an improved T-PPM technique is proposed, which is suitable for single carrier weak turbulent spatial optical channels. In this method, Gray map is used to replace the "subset partition" mapping in traditional TCM, which reduces the possibility of misjudgment when receiving. The simulation results show that the lattice code mapping can significantly improve the error performance, and at the bit error rate of 10 ~ 3, the lattice code mapping improves the gain of about 0.2 dB compared with the subset mapping, and the error performance of the system is improved effectively. Under the condition of 1 ps and 2 ps BER, the bit error rate (BER) is reduced to about 1 ~ 2 and 4 ~ 5 of the traditional scheme, respectively, which proves the superiority of Gray code mapping.
【作者单位】： 中国海洋石油总公司;
【分类号】：TN929.12
，
本文编号：2471628
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