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System, method and apparatus for channel estimation based on intra-symbol frequency domain averaging for coherent optical OFDM
System, method and apparatus for channel estimation based on intra-symbol frequency domain averaging for coherent optical OFDM
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机译：基于符号内频域平均的相干光OFDM的信道估计系统，方法和装置
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摘要
System, apparatus and method of optical communication are provided for performing efficient channel estimation for a CO-OFDM link utilizing an intra-symbol frequency-domain averaging (ISFA) to compensate for transmission impairments. An exemplary method includes receiving a pair of training symbols in an optical orthogonal frequency-division multiplexed (OFDM) signal, performing channel estimation to obtain a first estimated channel matrix for each of a plurality of subcarriers of the OFDM signal; and averaging the first estimated channel matrix of a first subcarrier with the first estimated channel matrix of others of the subcarriers to obtain a second estimated channel matrix for the first subcarrier. The second estimated channel matrix may be an average or weighted average. Prior to the averaging, compensation of chromatic dispersion may be performed. Channel compensation is performed based on the second estimated channel matrix for the first subcarrier of the OFDM signal and symbols then decoded.
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