基于ROPC的CO-OFDM系统相位噪声补偿方法研究  

Phase noise compensation method based on ROPC for CO-OFDM systems

作　　者：赵博[1] 李莉[1] 韩力[2] 胡贵军[1] 

机构地区：[1]吉林大学通信工程学院,吉林长春130012 [2]吉林大学物理学院,吉林长春130012

出　　处：《光电子．激光》2016年第1期31-37,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61177066)资助项目

摘　　要：为减少相位噪声分析补偿(APNC,analysis of phase noise compensation)方法开销过大、降低系统传输有效性的问题,本文在APNC方法的基础上提出了一种低开销相位噪声补偿(ROPC,reducing overhead analysis of phase noise compensation)方法。该方法仍以最小二乘(LS,least square)算法为基础,先通过信道冲激响应加窗(IRW,impulse response processed with window)法将信道冲激响应长度以外的噪声滤除,提升了信道估计的质量;之后采用类导频法进行相位噪声的估计和补偿,减少了相位噪声补偿中所需使用的导频数,降低了系统的开销,且算法的复杂度提升不大。仿真结果表明,在ROPC方法和APNC方法的误码率(BER)均约为10-3时,ROPC方法所需的导频数量约为APNC方法的1/2,减少了系统所需开销;在线宽为0.7 MHz且两种算法均采用4个导频时,ROPC方法的BER约为APNC方法的3/5,提高了系统的可靠性。To reduce the overhead of the analysis of phase noise compensation（APNC）method in coherent optical orthogonal frequency division multiplexing（CO-OFDM）system,we present a new reducing overhead analysis of phase noise compensation（ROPC）method based on APNC algorithm.This method use impulse response processed with window（IRW）algorithm relied on LS estimation to filter the noise outside the window,which improve can the accuracy of channel estimation.And then the method uses the quasi-pilot-aided phase noise estimation which decreases the number of pilots for phase noise compensation with the low complexity.The simulation results show that with the same BER,the number of pilots required for ROPC method is reduced by a factor of 2in comparison with that for the APNC method,which reduces the overhead of the system.The ROPC algorithm′s BERis similar with that of APNC method with the laser′s linewidth of 0.7MHz and 4pilots,which improves the reliability of the system.

关 键 词：相干光正交频分复用(CO-OFDM) 相位噪声补偿 低开销相位噪声补偿(ROPC) 相位噪声分析补偿(APNC) 

分 类 号：TN913.7[电子电信—通信与信息系统]