中文摘要：

一个混合极化部门为多跳跃的多路微分的阶段移动 keying-multipulse 脉搏位置调整(PDM-DPSK-MPPM ) 计划空间光(FSO ) 通讯被调查。在 Gamma-Gamma 骚乱隧道的建议系统的分析小点错误率(BER ) 被导出并且验证了使用计算机模拟。结果证明多跳跃和混合调整计划是有效技术改进 FSO 连接的表演。与调音的传统的二进制阶段移动(BPSK ) 和 MPPM 相比，混合计划能改进带宽利用效率和系统的可靠性。与 PDM-QPSK-MPPM 的协调解调相比，系统复杂性以 BER 性能的降级的成本被减少，它能在 FSO 系统改进混合调整技术的实物。

英文摘要：

A hybrid polarization division multiplexed-differential phase shift keying-multipulse pulse position modulation（PDM-DPSK-MPPM） scheme for multi-hop free-space optical（FSO） communication is investigated. The analytical bit error rate（BER） of the proposed system in Gamma-Gamma turbulence channels is derived and verified using computer simulation. The results show that both multi-hop and hybrid modulation schemes are efficient techniques to improve the performance of FSO links. Compared with the traditional binary phase shift keying（BPSK） and MPPM, the hybrid scheme can improve the bandwidth-utilization efficiency and reliability of the system. Compared with the coherent demodulation of PDM-QPSK-MPPM, the system complexity is reduced at the cost of the degradation of BER performance, which can improve the practicality of hybrid modulation technology in FSO system.