摘要
为了进一步提高大气光通信系统的传输速率,设计了一种采用4阶脉冲幅度调制的超奈奎斯特(4PAM-FTN)速率大气光传输系统。推导了该系统在对数正态分布衰落信道中的理论误码率公式。分析了传输距离、波长对系统误码性能的影响,以及加速因子与传输速率之间的关系。蒙特卡罗仿真结果表明:误码率与传输距离成正比,与加速因子、光波长成反比。在加速因子为0.9时,系统可以在误码性能几乎不变的情况下获得6.1%的传输速率增益;当加速因子为0.83时,可以获得16.7%的传输速率增益。
A fourth-order pulse amplitude modulation faster-than-Nyquist(4PAM-FTN)rate atmospheric optical transmission system was proposed to improve the transmission rate.The theoretical bit error rate(BER)equation in a log-normal fading channel was derived.Then,the influence of transmission distance and laser wavelength on the system BER performance was discussed.Furthermore,the relationship between the acceleration factor and the transmission rate was analyzed.Monte Carlo simulation results reveal that the BER is proportional to the transmission distance,but inversely proportional to the acceleration factor and the laser wavelength.When the acceleration factor is 0.9,the system shows a 6.1%transmission rate gain with an almost invariable BER performance,and when the acceleration factor is 0.83,it achieves a 16.7%transmission rate gain.
作者
曹明华
张伟
张悦
王惠琴
武鑫
毛一聪
康中将
Cao Minghua;Zhang Wei;Zhang Yue;Wang Huiqin;Wu Xin;Mao Yicong;Kang Zhongjiang(School of Computer and Com munication,Lanzhou University of Technology,Lanzhou,Gan8u 730050,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2020年第23期140-145,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61875080,61861026)
甘肃省科技计划资助(20JR5RA472)。
关键词
光通信
脉冲幅度调制
对数正态湍流信道
误码率
超奈奎斯特
optics communications
pulse amplitude modulation
logarithmic normal turbulent channel
bit error rate
faster-than-Nyquist
