摘要
将双头脉冲间隔调制(DH-PIM)和最小均方(LMS)算法信道均衡技术应用于自由空间光通信,建立了基于DH-PIM和LMS信道均衡的自由空间光(FSO)通信系统的数学模型,研究了DH-PIM的符号结构、平均功率需求及其功率谱,并且与开关键控(OOK)、脉冲位置调制(PPM)等调制方式作了比较,对系统的性能指标进行了仿真.数学分析和仿真结果表明:该方法可以减小系统的误码率,降低系统发射光功率的需求,特别是在多径弥散信道、高速率和高吞吐量的情况下,效果更加明显.
The application of dual header pulse interval modulation （DH-PIM） and least mean square （LMS） channel equalization to free space optical （FSO） communication system was put forward. The commutation model of the system was established; the symbol structure, average power requirements and power spectral of DH-PIM was studied. Results were compared with other modulation schemes, such as on-off keying （OOK）, pulse position modulation （PPM）. From the mathematical analysis and the simulation, it is seen that BER （bit error ratio） of this system is lower and its performance is improved. Particularly in the multi-path dispersive channel, and when the channel is high-speed and high throughput, the results are more obvious.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期9-12,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
湖北省自然科学基金资助项目(2007ABA353)
关键词
自由空间光通信
双头脉冲间隔调制
信道均衡
最小均方算法
多径码间串扰
free space optical communication
dual header pulse interval modulation
channel equalization
least mean square algorithm
multi-path inter-symbol interference
