Cascaded constant modulus equalization algorithm in wireless optical communication systems

Ce Meng; Haifeng Yao; Zhi Liu; Xiaolong Ni; Xinsong Xue

doi:10.1117/12.2511376

7 November 2018 Cascaded constant modulus equalization algorithm in wireless optical communication systems

Ce Meng, Haifeng Yao, Zhi Liu, Xiaolong Ni, Xinsong Xue

Proceedings Volume 10832, Fifth Conference on Frontiers in Optical Imaging Technology and Applications; 1083219 (2018) https://doi.org/10.1117/12.2511376
Event: Fifth Conference on Frontiers in Optical Imaging Technology and Applications, 2018, Changchun, China

Abstract

When the optical signal is transmitted in atmospheric channel in the wireless optical communication (WOC) systems, the inter-symbol interference (ISI) will be caused by the atmospheric motion and the fading characteristics of the atmospheric channel. In addition, device noises such as photodetectors noises can also affect the signal in the real communication systems. It is difficult to eliminate both types of interference by the single equalization algorithm at the same time, therefore, a cascaded equalization algorithm is proposed. First of all, we use the MATLAB to simulate the cascaded equalization algorithm, the convergence performance of the algorithm is analyzed, the bit error rate (BER) under different signal-to-noise ratios (SNR) are also compared. Then, the algorithm is verified under laboratory conditions, we calculate the BER of the receiving signal, which is processed by the cascade equalization algorithm. The simulation analysis and experiments results show that, the convergence performance of the cascaded equalization algorithm is improved effectively, the ISI is decrease, the BER can reduce to about 10^-8 , decreased by 4 orders of magnitude than without equalization. It can improve the communication performance of the WOC systems, the validation of the cascaded equalization algorithm is verified.

Citation Download Citation

Ce Meng, Haifeng Yao, Zhi Liu, Xiaolong Ni, and Xinsong Xue "Cascaded constant modulus equalization algorithm in wireless optical communication systems", Proc. SPIE 10832, Fifth Conference on Frontiers in Optical Imaging Technology and Applications, 1083219 (7 November 2018); https://doi.org/10.1117/12.2511376

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KEYWORDS

Telecommunications

Signal detection

Signal processing

Atmospheric optics

Atmospheric modeling

Detection and tracking algorithms

Wireless communications

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