In this paper, an improved channel estimation scheme based on time-domain orthogonal gray complementary training sequence (Golay TS) is proposed to resist subcarrier mutual beat interference in 16-quadrature amplitude modulation multiband orthogonal-frequency-division-multiplexing ultrawide band over fiber (16QAM MB-OFDM UWBoF) systems. The simulation results showed that the performance of system with the improved Golay TS channel estimation scheme was improved by about 1 dB compared with the traditional Golay TS channel estimation scheme, at a bit error rate (BER) of 3.8 × 10−3 after 70 km standard single mode fiber (SSMF) transmission. At the same time, the synchronization and channel estimation performance of Golay TS and the selected frequency-domain orthogonal training sequences (TSs) were compared. The simulation results showed that the performance of system with the TSs channel estimation was improved by about 2.7 dB compared with the improved Golay TS channel estimation.

中文翻译：

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16QAM MB-OFDM UWBoF系统中改进的训练序列信道估计方案

本文提出了一种基于时域正交灰度互补训练序列（Golay TS）的改进信道估计方案，以抵抗16正交调幅多频带正交频分复用超宽带光纤中的子载波互拍干扰（ 16QAM MB-OFDM UWBoF) 系统。仿真结果表明，改进后的Golay TS信道估计方案与传统的Golay TS信道估计方案相比，系统性能提高了约1 dB，70 km后误码率为3.8 × 10−3标准单模光纤 (SSMF) 传输。同时，比较了Golay TS与所选频域正交训练序列（TS）的同步和信道估计性能。