Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals
Orthogonal frequency division multiplexing (OFDM) technology is presented for use in free-space optical (FSO) communications accompanied by the spatial diversity reception. Using quadrature phase shift keying (QPSK) modulation formats, the OFDM signals show robustness to support high spectral effici...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/14/6828 |
| _version_ | 1797407742054367232 |
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| author | Yang Huang Xinyi Zheng Yufei Guo Shiming Gao |
| author_facet | Yang Huang Xinyi Zheng Yufei Guo Shiming Gao |
| author_sort | Yang Huang |
| collection | DOAJ |
| description | Orthogonal frequency division multiplexing (OFDM) technology is presented for use in free-space optical (FSO) communications accompanied by the spatial diversity reception. Using quadrature phase shift keying (QPSK) modulation formats, the OFDM signals show robustness to support high spectral efficiency and compatibility with the spatial diversity reception to improve receiver sensitivity. Compared with the single-carrier QPSK signal, the OFDM-QPSK signal with 64 sub-carriers can reduce the BER from 2.87 × 10<sup>−3</sup> to 2.98 × 10<sup>−4</sup> at the SNR of 6 dB. Using a two-aperture spatial diversity reception with OFDM, the BER can be reduced from 2.45 × 10<sup>−3</sup> of a single receiver to 6.10 × 10<sup>−4</sup> under moderate turbulence conditions. Under strong turbulence, the BER of the single receiver is 2.14 × 10<sup>−2</sup>. It can be improved to 1.16 × 10<sup>−3</sup> by using four-aperture receivers, and even 6.87 × 10<sup>−4</sup> by using six-aperture receivers. The optimized aperture number should be selected according to channel conditions. |
| first_indexed | 2024-03-09T03:46:02Z |
| format | Article |
| id | doaj.art-f8775c3319f145a1a8728f4334ac5b7c |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T03:46:02Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-f8775c3319f145a1a8728f4334ac5b7c2023-12-03T14:34:38ZengMDPI AGApplied Sciences2076-34172022-07-011214682810.3390/app12146828Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM SignalsYang Huang0Xinyi Zheng1Yufei Guo2Shiming Gao3Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310058, ChinaCentre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310058, ChinaCentre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310058, ChinaCentre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310058, ChinaOrthogonal frequency division multiplexing (OFDM) technology is presented for use in free-space optical (FSO) communications accompanied by the spatial diversity reception. Using quadrature phase shift keying (QPSK) modulation formats, the OFDM signals show robustness to support high spectral efficiency and compatibility with the spatial diversity reception to improve receiver sensitivity. Compared with the single-carrier QPSK signal, the OFDM-QPSK signal with 64 sub-carriers can reduce the BER from 2.87 × 10<sup>−3</sup> to 2.98 × 10<sup>−4</sup> at the SNR of 6 dB. Using a two-aperture spatial diversity reception with OFDM, the BER can be reduced from 2.45 × 10<sup>−3</sup> of a single receiver to 6.10 × 10<sup>−4</sup> under moderate turbulence conditions. Under strong turbulence, the BER of the single receiver is 2.14 × 10<sup>−2</sup>. It can be improved to 1.16 × 10<sup>−3</sup> by using four-aperture receivers, and even 6.87 × 10<sup>−4</sup> by using six-aperture receivers. The optimized aperture number should be selected according to channel conditions.https://www.mdpi.com/2076-3417/12/14/6828free-space optical communicationsorthogonal frequency division multiplexingspatial diversity reception |
| spellingShingle | Yang Huang Xinyi Zheng Yufei Guo Shiming Gao Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals Applied Sciences free-space optical communications orthogonal frequency division multiplexing spatial diversity reception |
| title | Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals |
| title_full | Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals |
| title_fullStr | Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals |
| title_full_unstemmed | Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals |
| title_short | Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals |
| title_sort | performance improvement of the free space optical communication link using spatial diversity reception assisted ofdm signals |
| topic | free-space optical communications orthogonal frequency division multiplexing spatial diversity reception |
| url | https://www.mdpi.com/2076-3417/12/14/6828 |
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