中国激光, 2015, 42 (12): 1205002, 网络出版: 2015-12-01
基于小波降噪和改进ISFA 的CO-OFDM 信道估计方法
Channel Estimation Method Based on Wavelet and Improved ISFA for CO-OFDM Syetems
光通信 相干光正交频分复用 信道估计 小波变换 符号内频域平均 optical communications coherent optical orthogonal frequency division mul channel estimation wavelet transform intra-symbol frequency domain averaging
摘要
提出了一种基于小波降噪与改进的符号内频域平均(ISFA)联合的相干光正交频分复用(CO-OFDM)系统信道估计方法。该方法利用最小二乘(LS)方法进行信道估计，并对估计后的结果进行小波去噪处理，最后采用Kaiser窗函数改进ISFA 算法对小波处理结果进行ISFA，完成联合去噪。仿真结果表明，该方法可以有效地提高信道估计精度。当光信噪比(OSNR)为17 dB时，该算法的误码性能(BER)比ISFA 算法的误码性能提高将近一个量级。
Abstract
A joint method of coherent optical orthogonal frequency division multiplexing (CO-OFDM) channel estimation based on wavelet denoising and improved intra-symbol frequency domain average (ISFA) is proposed. This method can be divided into three steps. Firstly, channel estimation is performed by least square (LS) method; secondly, the wavelet denoising processing is made for the results of estimation; finally, ISFA algorithm improved by Kaiser- window function is applied to the wavelet processing results. The simulation results show that the proposed method can effectively improve the precision of channel estimation. When the optical signal-tonoise ratio (OSNR) is 17 dB, bit error rate (BER) performance of the proposed method can be improved nearly one order of magnitude than that of ISFA method.
刘剑飞, 石慧敏, 曾祥烨, 卢嘉, 王蒙军, 刘蓓蕾, 魏春歌. 基于小波降噪和改进ISFA 的CO-OFDM 信道估计方法[J]. 中国激光, 2015, 42(12): 1205002. Liu Jianfei, Shi Huimin, Zeng Xiangye, Lu Jia, Wang Mengjun, Liu Beilei, Wei Chunge. Channel Estimation Method Based on Wavelet and Improved ISFA for CO-OFDM Syetems[J]. Chinese Journal of Lasers, 2015, 42(12): 1205002.
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