Scattered pilot-based channel estimation with joint noise reduction for PDM-CO-OFDM system |
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Authors: | Jianfei Liu Jie LiXiangye Zeng Jia LuMengjun Wang |
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Institution: | School of Information Engineering, Hebei University of Technology, Tianjin 300401, China |
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Abstract: | To improve the accuracy of the channel estimation in PDM-CO-OFDM system when LS algorithm is used, a joint denoising method is proposed in this paper. We have theoretically proposed and simulated designed scattered pilot pattern for PDM-CO-OFDM system, then multi-wavelet is used to denoise the LS channel estimation results which have been interpolation in frequency domain, ISFA is further used to denoise signals after interpolation in time domain. Simulation results show that for 4-QAM, 80 GB/s PDM-CO-OFDM system, the proposed joint denoising method has improved 0.96 dB in OSNR sensitivity at the BER of 1e−3 (threshold of FEC) compared to the common LS method and reduced system overhead at the same time. |
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Keywords: | Scattered pilot Channel estimation Multi-wavelet denoising Orthogonal frequency division multiplexing Intra-symbol frequency-domain averaging (ISFA) |
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