摘要
为补偿CO-OFDM系统中相位噪声引起的干扰,提出了一种改进的基于线性内插的相位噪声补偿算法。该算法利用共轭导频估计相位噪声的均值,然后通过线性内插获得相位噪声的估计值,最后通过频域补偿来恢复出调制信号。此外针对求幅角的非线性运算中存在的相位周跳的问题,文章提出的修正方法能够有效地改善周跳情况的发生。分析与仿真表明:该算法在不同线宽条件下均能提升一定的SNR增益且算法的复杂度低。
In order to compensate the interference from the phase noise in CO-OFDM systems, an improved phase noise compensation algorithm based on linear interpolation was proposed. The algorithm uses conjugate pilots to estimate the mean of the phase noise, and then the mean phase noise is estimated by the linear interpolation. Finally, the modulation symbols is recovered by the frequency domain compensation. Moreover, aiming at the problem of the phase cycle slip caused by the nonlinear operation in the process of computing angle, the proposed method can effectively improve the occurrence of the cycle slip. Analysis and simulation results show that the proposed algorithm can improve the SNR gain under various linewidths and decrease the complexity.
出处
《半导体光电》
CAS
北大核心
2016年第5期716-720,共5页
Semiconductor Optoelectronics
基金
国家自然科学基金项目(61472464)
重庆市基础与前沿研究计划项目(cstc2015jcyjA0554
cstc2013jcyjA40017)
重庆邮电大学(重庆市)研究生科研创新项目(CYS14144)
关键词
相干光正交频分复用
相位噪声
共轭导频
线性插值
coherent optical orthogonal frequency-division multiplexing
phase noise
conjugate pilot
linear interpolation
