Performance Enhanced of Geometrically Shaped 64-QAM With LDPC in UOWC System

被引：8

作者：

Liang, Jiacong ^{[1
]}

He, Jing ^{[1
]}

机构：

[1] Hunan Univ, Coll Comp Sci & Elect Engn, Changsha 410082, Peoples R China

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 2022年 / 34卷 / 15期

基金：

中国国家自然科学基金;

关键词：

Geometrically shaped; LDPC; OFDM; UOWC; OFDM;

D O I：

10.1109/LPT.2022.3188725

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this letter, to mitigate the decrease of the received optical power caused by scattering, attenuation and reflection in underwater optical wireless communication (UOWC) system, geometrically shaped (GS) 64-ary quadrature amplitude modulation (QAM) based orthogonal frequency division multiplexing (OFDM) is proposed and experimentally demonstrated in UOWC system. And low-density parity-check codes (LDPC) are employed. By using soft decoding algorithm of LDPC, the complexity of demodulation for GS 64-QAM is the same as the uniform 64-QAM. The experimental results show that, the data rate of GS 64-QAM OFDM signal can achieve 3.33Gbps after transmission over 4.2m underwater and 5m free space channel. Compared with the uniform 64-QAM scheme, the proposed scheme can improve the receiver sensitivity of 0.8dB at the bit-error rate (BER) of 3.8x10(-3) .

引用

页码：807 / 810

页数：4

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