Intra symbol frequency domain averaging channel estimation for coherent optical OFDM/OQAM system

Xi Fang; Yuchao Wang; Lei Zhang; Ding Ding; Jianxin Wang; Xianwei Gao

doi:10.1117/12.2518283

14 February 2019 Intra symbol frequency domain averaging channel estimation for coherent optical OFDM/OQAM system

Xi Fang, Yuchao Wang, Lei Zhang, Ding Ding, Jianxin Wang, Xianwei Gao

Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 1104804 (2019) https://doi.org/10.1117/12.2518283
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

Abstract

Compared to conventional orthogonal frequency-division multiplexing (OFDM), orthogonal frequency-division multiplexing offset quadrature amplitude modulation (OFDM/OQAM) system relaxes the orthogonal condition from the complexed field to real field, cyclic prefix (CP) could thus be removed to promote spectral efficiency. However, there exists intrinsic imaginary interference (IMI) for OFDM/OQAM systems when faced with multiple-path fading channel. Therefore, developing effective channel estimation method to suppress IMI effect is very important for maintaining the performance of the OFDM/OQAM systems. Recently, numerical discussions on channel estimation method for coherent optical OFDM/OQAM (CO-OFDM/OQAM) have been reported. For these works, although frequency domain channel estimation method based on the using of pseudo pilot have been established, the correlation of the noise on each subcarrier brought by the half period time offset between the real and imaginary part, have not been taken into consideration. In this case, the channel estimation accuracy might not be optimal. In this paper, we proposed intra symbol frequency domain averaging (ISFDA) channel estimation method based on the maximum-likelihood algorithm for this system to decrease the interference induced by the correlation property. We analyzed the correlation property of the received amplified spontaneous emission (ASE) noise on each subcarrier for CO-OFDM/OQAM system and performed weighed averaging method for the frequency domain channel transmission matrix. As shown in the theoretical analysis and simulation results, the interference induced by the correlation property of the ASE noise could be suppressed significantly thanks to the using of the ISFDA method.

Citation Download Citation

Xi Fang, Yuchao Wang, Lei Zhang, Ding Ding, Jianxin Wang, and Xianwei Gao "Intra symbol frequency domain averaging channel estimation for coherent optical OFDM/OQAM system", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 1104804 (14 February 2019); https://doi.org/10.1117/12.2518283

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KEYWORDS

Orthogonal frequency division multiplexing

Prototyping

Quadrature amplitude modulation

Receivers

Systems modeling

Statistical analysis

Time-frequency analysis

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