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Non-uniform QAM OFDM modulation system based on probabilistic shaping and geometric shaping
Author(s): Xiumin Song; Qi Zhang; Xiangjun Xin; Feng Tian; Qinghua Tian; Yang Wang; Wei Zhang; Ying Tao; Yongjun Wang; Leijing Yang
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Paper Abstract

A non-uniform QAM OFDM modulation system based on probabilistic shaping (PS) and geometric shaping (GS) is proposed in this paper, which can effectively resist the interference among signal waveforms and improve spectrum utilization and channel capacity. First, Huffman coding is used in the scheme for probability shaping to reduce the average energy of the signal. Uniform 16QAM is adjusted to non-uniform 12QAM and uniform 32QAM is adjusted to non-uniform 12QAM. Then geometric shaping is applied. Taking generalized mutual information (GMI) as the objective function, pairwise optimization (PO) algorithm is applied to continuously adjust the constellation. Finally, the coordinate point with the largest mutual information is obtained. The simulation results show the performance of non-uniform 12QAM and non-uniform 24QAM under different conditions, we obtain the signal-to-noise ratio (SNR) with generalized mutual information curve, signal-to-noise ratio with bit error rate (BER) curve under different QAM modulation formats and the bit error rate with the different length of the fiber under different transmission modes. The results show that the proposed non-uniform 12QAM-GS-OFDM has a gain of 0.02 bit/symbol over 12QAM-OFDM, the proposed non-uniform 24QAM-GS-OFDM has a gain of 0.02 bit/symbol over 24QAM-OFDM.

Paper Details

Date Published: 20 December 2019
PDF: 10 pages
Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112093G (20 December 2019); doi: 10.1117/12.2548837
Show Author Affiliations
Xiumin Song, Beijing Univ. of Posts and Telecommunications (China)
Qi Zhang, Beijing Univ. of Posts and Telecommunications (China)
Xiangjun Xin, Beijing Univ. of Posts and Telecommunications (China)
Feng Tian, Beijing Univ. of Posts and Telecommunications (China)
Qinghua Tian, Beijing Univ. of Posts and Telecommunications (China)
Yang Wang, China Electric Power Research Institute Co., Ltd. (China)
Wei Zhang, China Academy of Space Technology (China)
Ying Tao, China Academy of Space Technology (China)
Yongjun Wang, Beijing Univ. of Posts and Telecommunications (China)
Leijing Yang, Beijing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 11209:
Eleventh International Conference on Information Optics and Photonics (CIOP 2019)
Hannan Wang, Editor(s)

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