基于不同导频插入方式的光OFDM补偿技术  

Compensation Technology with Different Pilot Arrangement for Optical OFDM

作　　者：张京东[1] 石健[1] 胡贵军[1] 

机构地区：[1]吉林大学通信工程学院,长春130012

出　　处：《半导体光电》2012年第1期102-105,共4页Semiconductor Optoelectronics

基　　金：国家自然科学基金资助项目(61077054)

摘　　要：为了验证在光正交频分复用(OOFDM)通信系统中,导频插入方式对系统补偿性能的影响,寻找适合OOFDM系统补偿技术的导频插入方式,以实现OOFDM系统的长距离传输,首先,介绍了无线OFDM中三种典型的导频插入方式,然后,用VPI Transmission maker搭建一个OOFDM仿真系统,作为模拟传输平台。最后,采用一种简单、准确的信道估计算法,利用插入的导频估计出信道信息,并对接收到的信号进行相应的补偿,比较三种导频插入方式的补偿效果。仿真结果表明:时域块状导频插入方式和斜对角导频插入方式,经500km传输后补偿后的误码率为10-5量级,其中斜对角的效果更好一些;而频域块状导频插入方式达到相同的误码率数量级时,只能传输300km。三种导频插入方式中,时域块状导频和斜对角导频估计补偿效果更好,更适合光OFDM通信系统。In order to validate the influence of pilot arrangements on the compensation performance of optical orthogonal frequency division multiplexing（OOFDM） communication system,and to find a pilot arrangement which is better for OOFDM communication system,first,three typical pilot arrangements in wireless OFDM are introduced.Then,an OOFDM experiment system is set up to simulate the transmission.Finally,the received signal is compensated using the information obtained from the pilots and the compensation performance of the three different pilot arrangements are compared.The simulation results indicate that time domain block pilot and diagonal pilot can get a BER of 10-5 magnitude after compensation of 500 km fiber transmission,and the diagonal is slightly better.While if the frequency domain block pilot achieves the same order of magnitude,it can only transmit 300 km.Among the three pilot arrangements,time domain block pilot and diagonal pilot get better compensation performance,and are more suitable for OOFDM communication system.

关 键 词：OFDM 导频 插入方式 光纤 信道估计 

分 类 号：TN929.11[电子电信—通信与信息系统]