Neural Successive Cancellation Polar Decoder With Tanh-Based Modified LLR Over FSO Turbulence Channel

Abstract

The neural successive cancellation (NSC) decoder with tanh-based modified log-likelihood ratio (LLR) is proposed for reducing the decoding latency of polar codes over free space optical (FSO) turbulence channel. The conventional successive cancellation (SC) decoder is partitioned into multiple sub-blocks, which are replaced by multiple sub neural network (NN) decoders with tanh-based modified LLR. The recursive characteristic of the polar sequences reliability ranking given in 5G standard enables the sub-NN decoder to be uniquely determined by code length and the number of information bits. Confirmed by the simulation, the bit error rate (BER) performance of NSC decoder with tanh-based modified LLR is close to the conventional SC decoder over turbulence channel for the practical-length polar codes. Regarding turbulence-stability, the NSC decoder trained in moderate and strong turbulence conditions have stable performance in a wide range of turbulence conditions. Moreover, in comparison of decoding latency, the NSC decoder with tanh-based modified LLR takes less than 25% time steps of SC decoder in the same code length.

2020 Index IEEE Photonics Journal Vol. 12

“…+ Check author entry for coauthors Yang, B., Chi, H., Yang, S., Cao, Z., Ou, J., and Zhai, Y., Broadband Microwave Spectrum Sensing Based on Photonic RF Channelization and Compressive Sampling; JPHOT Feb. 2020 5500109 Yang, B., Chen, H., Yang, S., and Chen, M., A Design Method of Optical Phased Array With Insufficient Phase Tuning Range; JPHOT April 2020 6600409 Yang, C., see Luo, J., JPHOT April 2020 7500415 Yang, C., see Liu, C., JPHOT April 2020 7200811 Yang, C., see He, J., JPHOT June 2020 7800712 Yang, C., see Lee, C., JPHOT June 2020 7100910 Yang, C., Shan, K., Chen, J., Hou, J., and Chen, S., CNN-Based Phase Matching for the OAM Mode Selection in Turbulence Heterodyne Coherent Mitigation Links; JPHOT Dec. 2020 7905913 Yang, D., see Wang, Y., JPHOT Aug. 2020 5501710 Yang, D., see Li, X., JPHOT June 2020 4900208 Yang, D., see Li, J., JPHOT Oct. 2020 5900509 Yang, F., see Wang, Y., JPHOT Aug. 2020 5501710 Yang, F., see Huang, X., JPHOT April 2020 7901512 Yang, G., see Arvanitakis, G.N., JPHOT April 2020 7901210 Yang, G., see 7202408 Yang, H., see Zhang, H., JPHOT Aug. 2020 7102213 Yang, H., Xiong, Z., Hu, H., Chen, Y., Zhang, X., and Xu, J., Spatial-Dependent Hamiltonian Formulation of Cross-Mode Modulation; JPHOT Feb. 2020 6100208 Yang, H., see Chen, M., JPHOT June 2020 4500609 Yang, H., see Fang, J., JPHOT Dec. 20207906110 Yang, H., see Wang, Y., JPHOT Dec. 2020 3200712 Yang, J., see Li, Z., JPHOT Aug. 2020 3900613 Yang, J., see 7903712 Yang, J., see He, X., JPHOT Aug. 2020 2200410 Yang, J., see Zhang, Q., JPHOT April 2020 6600810 Yang, J., see Zhang, B., JPHOT April 2020 6600610 Yang, J., see Chu, C., JPHOT June 2020 7902409 Yang, J., see Song, S., JPHOT Oct. 2020 3901016 Yang, J., see Chen, Y., 7103109 Yang, J., see Gu, J., JPHOT Dec. 2020 7103612 Yang, K., see Lian, T., JPHOT Aug. 2020 6601610 Yang, K., see 6800214 Yang, K., see Lv, W.,…”