摘要
大气湍流效应会导致自由空间光通信(FSO)系统链路性能恶化。研究了在自由空间光通信中采用正交频分复用(OFDM)调制技术,分析了采用OFDM调制的自由空间光通信系统在Gamma-Gamma大气湍流信道下的误码率性能。比较了不同大气湍流强度下,采用开关键控(OOK)调制系统和OFDM调制系统的误码率。仿真结果表明,随着湍流强度加强,OOK调制系统和OFDM调制系统性能都在不断恶化,不同湍流强度下,16QAM-OFDM系统比4QAM-OFDM系统误码率更大,4QAM-OFDM系统性能优于OOK调制系统。
The effect of the atmospheric turbulence can deteriorate the performance of the free-space optical （FSO） communication system. A technique for using orthogonal frequency division multiplexing （OFDM） modulation in FSO is studied, the bit error rate （BER） performance of FSO-OFDM modulation system over Gamma-Gamma atmospheric turbulence is analyzed. Under different atmospheric turbulence intensity, the BER of OFDM modulation system is compared with on/off keying （OOK） modulation system. The simulation results show that OOK modulation system and OFDM modulation system are deteriorating with the strengthening of turbulence intensity, under different atmospheric turbulence intensity, the BER performance of 4QAM-OFDM modulation system is better than 16QAM- OFDM modulation system and OOK modulation system.
出处
《激光与光电子学进展》
CSCD
北大核心
2012年第11期36-40,共5页
Laser & Optoelectronics Progress
关键词
自由空间光通信
大气湍流
正交频分复用
误码率
free-space optical communications
atmospheric turbulence
orthogonal frequency division multiplexing
bit error rate
