Optoelectronics Letters, Volume. 18, Issue 3, 152(2022)
Multi-level modulation scheme based on PAK algorithm for optical camera communications
In an optical camera communication (OCC) system, multi-level modulation is essential for data rate enhancement with the finite frame rate of the receiving camera constraint, where the K-means algorithm is widely used as a thresholding scheme. The result of K-means clustering is sensitive to initial cluster centers. In this paper, we propose a multi-level modulation scheme utilizing the pilot-aided K-means (PAK) algorithm. PAK algorithm innovates in both obtaining the state of the stripes propagated through the optical channel under different environments and overcoming the susceptibility of K-means. Our scheme could prompt data rate and improve the performance of OCC. Finally, non-orthogonal multiple access (NOMA) pattern is designed based on the proposed scheme to achieve multiplex communications.
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WU Jing, CHI Xuefen, JI Fenglei, JIANG Keyu, CHEN Shaoqi, LI Shuai. Multi-level modulation scheme based on PAK algorithm for optical camera communications[J]. Optoelectronics Letters, 2022, 18(3): 152
Received: May. 29, 2021
Accepted: Aug. 10, 2021
Published Online: Jan. 20, 2023
The Author Email: Xuefen CHI (chixf@jlu.edu.cn)