| 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,(3):152-157 |
| Multi-level modulation scheme based on PAK algorithm for optical camera communications |
| Author Name | Affiliation | | WU Jing | Department of Communications Engineering, Jilin University, Changchun 130012, China | | CHI Xuefen | Department of Communications Engineering, Jilin University, Changchun 130012, China | | JI Fenglei | Department of Communications Engineering, Jilin University, Changchun 130012, China | | JIANG Keyu | Department of Communications Engineering, Jilin University, Changchun 130012, China | | CHEN Shaoqi | Department of Communications Engineering, Jilin University, Changchun 130012, China | | LI Shuai | Department of Communications Engineering, Jilin University, Changchun 130012, China |
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| Abstract: |
| 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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