基于正交空时分组码的空间脉冲位置调制  

Orthogonal Space Time Block Coding for Spatial Pulse Position Modulation

作　　者：毛忠阳 李寅龙 刘锡国 徐建武 刘敏 伍强 MAO Zhong-yang;LI Yin-long;LIU Xi-guo;XU Jian-wu;LIU Min;WU Qiang(Naval Aviation University,Yantai 264001,China;The Unit 91423 of PLA,Laiyang 265201,China)

机构地区：[1]海军航空大学,山东烟台264001 [2]解放军91423部队,山东莱阳265201

出　　处：《光通信研究》2021年第2期14-19,共6页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61701518);山东省“泰山学者”建设工程专项经费基金资助项目(ts20081130)。

摘　　要：针对在湍流信道下空间脉冲位置调制(SPPM)系统误码性能较差的问题,文章将空时分组码与空间调制技术结合,提出了基于比特补码正交空时分组码的空间脉冲位置调制(BCOSTBC-SPPM),利用空时编码增加信息冗余度以改善系统误码性能。同时基于最大似然(ML)检测推导了系统的理论误比特率上界,并通过蒙特卡洛仿真对理论上界进行了验证。仿真结果表明,BCOSTBC-SPPM的误码性能相比SPPM有较大提升。在弱湍流信道下,当系统误比特率为10-4时,(4,2,4)-BCOSTBC-SPPM相比(4,1,4)-SPPM信噪比改善约10 dB。该方式相较于传统正交空时编码方案在频谱效率方面有一定提升,实现了系统有效性和可靠性的合理权衡。The system performance of Spatial Pulse Position Modulation(SPPM)is poor in turbulent channels.In order to solve this problem,the bit complement orthogonal space time Block Coding for Spatial Pulse Position Modulation(BCOSTBC-SPPM)is proposed by combining space-time block codes with spatial modulation technology to improve the bit error rate performance using the space-time coding information redundancy.Based on Maximum Likelihood(ML)detection,the bit error rate expression of the proposed modulation is derived and is verified by Monte Carlo simulation.The simulation results show that compared with SPPM,the error performance of BCOSTBC-SPPM is greatly improved.At the bit error rate of 10-4,(4,2,4)-BCOSTBC-SPPM improves the signal-noise ratio by about 10 dB when comparing with(4,1,4)-SPPM under weak turbulence.Compared with the traditional orthogonal space-time coding scheme,this method has a certain improvement in spectrum efficiency,and realizes a reasonable trade-off between system effectiveness and reliability.

关 键 词：大气激光通信 空间调制 正交空时编码 空间脉冲位置调制 

分 类 号：TN929.1[电子电信—通信与信息系统]