Frame Synchronization for FSO Links With Unknown Signal Amplitude and Noise Power
In this letter, we investigate the problem of frame synchronization in a free-space optical (FSO) communications link, where a known synch pattern is periodically embedded in the transmitted bitstream. The modulation format is on-off keying (OOK) and the electrical signal provided by the photo-detec...
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| Veröffentlicht in: | IEEE wireless communications letters 2021-07, Vol.10 (7), p.1498-1502 |
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| creator | Morelli, Michele Moretti, Marco D'Amico, Antonio Alberto Colavolpe, Giulio |
| description | In this letter, we investigate the problem of frame synchronization in a free-space optical (FSO) communications link, where a known synch pattern is periodically embedded in the transmitted bitstream. The modulation format is on-off keying (OOK) and the electrical signal provided by the photo-detector is plagued by a mixture of thermal and shot noise with signal-dependent power. Due to atmospheric turbulence, channel attenuation can exhibit large random fluctuations, so that no prior knowledge of the signal level and noise variances is assumed. These parameters, together with the start-of-frame, are jointly estimated using a simplified maximum likelihood (ML) approach. Numerical simulations indicate that the proposed scheme is able to effectively exploit the presence of shot noise to improve its detection capability, and outperforms the standard frame synchronization method tailored for an AWGN channel with signal-independent noise power. |
| doi_str_mv | 10.1109/LWC.2021.3072630 |
| format | Article |
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(IEEE) 2021</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c333t-2a7b020c7b272727a374dcd283b1389e0d1468d16643fddc2eb1452463b8979f3</citedby><cites>FETCH-LOGICAL-c333t-2a7b020c7b272727a374dcd283b1389e0d1468d16643fddc2eb1452463b8979f3</cites><orcidid>0000-0002-4017-7439 ; 0000-0002-3822-0995 ; 0000-0002-9683-7088 ; 0000-0002-0577-8626</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/9403396$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,776,780,792,27901,27902,54733</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/9403396$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>Morelli, Michele</creatorcontrib><creatorcontrib>Moretti, Marco</creatorcontrib><creatorcontrib>D'Amico, Antonio Alberto</creatorcontrib><creatorcontrib>Colavolpe, Giulio</creatorcontrib><title>Frame Synchronization for FSO Links With Unknown Signal Amplitude and Noise Power</title><title>IEEE wireless communications letters</title><addtitle>LWC</addtitle><description>In this letter, we investigate the problem of frame synchronization in a free-space optical (FSO) communications link, where a known synch pattern is periodically embedded in the transmitted bitstream. 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Numerical simulations indicate that the proposed scheme is able to effectively exploit the presence of shot noise to improve its detection capability, and outperforms the standard frame synchronization method tailored for an AWGN channel with signal-independent noise power.</description><subject>Atmospheric attenuation</subject><subject>Atmospheric modeling</subject><subject>Atmospheric turbulence</subject><subject>Avalanche photodiodes</subject><subject>frame synchronization</subject><subject>Free space optical communications</subject><subject>Free-space optical communication</subject><subject>Noise</subject><subject>On-Off Keying</subject><subject>on-off keying (OOK)</subject><subject>Optical attenuators</subject><subject>Optical fiber communication</subject><subject>Optical noise</subject><subject>Optical receivers</subject><subject>Shot noise</subject><subject>Synchronism</subject><subject>Synchronization</subject><issn>2162-2337</issn><issn>2162-2345</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNo9kE1LAzEQhoMoWLR3wUvAc2uSyW52j6VYFRar1NJjyG6yNv1IarKl1F_vLi2dOcwcnncYHoQeKBlSSvLnYjEeMsLoEIhgKZAr1GM0ZQMGPLm-7CBuUT_GFWkrJZTRrIe-JkFtDZ4dXbUM3tk_1VjvcO0DnsymuLBuHfHCNks8d2vnDw7P7I9TGzza7ja22WuDldP4w9to8Kc_mHCPbmq1iaZ_nndoPnn5Hr8Niunr-3hUDCoAaAZMiZIwUomSia4VCK4rzTIoKWS5IZryNNM0TTnUWlfMlJQnjKdQZrnIa7hDT6e7u-B_9yY2cuX3oX0tSpbwXCRdsqXIiaqCjzGYWu6C3apwlJTIzp1s3cnOnTy7ayOPp4g1xlzwnBOAPIV_Y1doRQ</recordid><startdate>20210701</startdate><enddate>20210701</enddate><creator>Morelli, Michele</creator><creator>Moretti, Marco</creator><creator>D'Amico, Antonio Alberto</creator><creator>Colavolpe, Giulio</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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| subjects | Atmospheric attenuation Atmospheric modeling Atmospheric turbulence Avalanche photodiodes frame synchronization Free space optical communications Free-space optical communication Noise On-Off Keying on-off keying (OOK) Optical attenuators Optical fiber communication Optical noise Optical receivers Shot noise Synchronism Synchronization |
| title | Frame Synchronization for FSO Links With Unknown Signal Amplitude and Noise Power |
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