Mu njira yolumikizirana ya digito, wolandila amalandira kuchuluka kwa siginecha yotumizidwa ndi phokoso lanjira.
Thekulandira bwinoza ma sigino a digito kutengera muyeso "wabwino" wokhala ndi cholakwika chochepa kwambiri.Zolakwa zomwe zafotokozedwa m'mutuwu makamaka chifukwa cha phokoso loyera la Gaussian lopanda gulu.Pansi pamalingaliro awa, chizindikiro chosinthika cha digito chimagawidwa m'mitundu itatu: chizindikiro chotsimikizika, chizindikiro chodalira gawo, ndi chizindikiro chosinthasintha.Kuthekera kosachepera kotheka kumawunikidwa mochulukira.Kuphatikiza apo, kuthekera kolakwika kolandila ma sign a baseband amitundu yambiri kumawunikidwanso.
Themfundo zofunika za kusanthulandikuwona zisankho zonse za chizindikiro cholandilidwa ngati vekitala mu malo olandilidwa a k-dimensional olandilidwa ndikugawa malo omwe alandilidwa m'magawo awiri.Kaya cholakwika chikuchitika kapena ayi zimatsimikiziridwa molingana ndi dera lomwe vesi lolandila likugwera.Chojambula cha block block cha wolandila bwino kwambiri chikhoza kupezeka ndipo kuchuluka kwa zolakwika pang'ono kumatha kuwerengedwa potengera chisankho.Kulakwitsa kwapang'ono kumeneku ndikokwanira bwino—ndiko kuti, kakang'ono kwambiri kotheka.
Themulingo woyenera pang'ono cholakwikakuchuluka kwa chizindikiro cha binary deterministic kumatsimikiziridwa ndi coefficient p ya zizindikiro ziwiri ndi chiŵerengero cha signal-to-noise E/n, koma ilibe chiyanjano chachindunji ndi mawonekedwe a mafunde.Kuchepa kwa coefficient p, kumachepetsa kuchuluka kwa zolakwika.Cholumikizira cholumikizira cha chizindikiro cha 2PSK ndichocheperako (p = -1), ndipo kulakwitsa kwake pang'ono ndikotsika kwambiri.Chizindikiro cha 2FSK chitha kuwonedwa ngati chizindikiro cha quadrature ndipo coefficient yake yolumikizana ndi p = 0.
Za kuchizindikiro chotsatirandi chizindikiro chosinthasintha, chokhachoChithunzi cha FSKamagwiritsidwa ntchito ngati woimira kusanthula, chifukwa mu njira iyi, matalikidwe ndi gawo la chizindikirocho zimasintha mwachisawawa chifukwa cha phokoso, kotero chizindikiro cha FSK chimakhala choyenera kwambiri pakugwiritsa ntchito.Popeza tchanelo chimapangitsa kusintha kwachisawawa pagawo lazizindikiro, kutsitsa kogwirizana sikungagwiritsidwe ntchito.M'malo mwake, demodulation yosagwirizanitsa ndiyo njira yabwino yolandirira chizindikiro.
Poyerekeza ndi mitengo yolakwika pang'ono ya wolandila weniweni ndimulingo woyenera wolandila, zitha kuwoneka kuti ngati chiŵerengero cha mphamvu ya signal-to-noise r mu wolandira weniweni ndi wofanana ndi chiŵerengero cha mphamvu ya chizindikiro ku mphamvu ya phokoso lamphamvu yamagetsi mu wolandila mulingo woyenera E/n, kuchuluka kwa zolakwika pang'ono ziwiri ndi zofanana.Komabe, izi sizingatheke nthawi zonse chifukwa cha olandira enieni.Chifukwa chake, magwiridwe antchito a wolandila nthawi zonse amakhala oyipa kuposa omwe amalandila bwino kwambiri.
Izi ndi zomwe Shenzhen HDV Phoelectron Technology Co., Ltd. kwa inu.ikubweretserani "Kulandila Kwabwino Kwambiri kwa Zizindikiro Za digito".Ndikukhulupirira kuti nkhaniyi ikuthandizani kuti muwonjezere chidziwitso chanu.Kupatula nkhaniyi ngati mukuyang'ana kampani yabwino yopanga zida zoyankhulirana zama fiber zomwe mungaganizirezambiri zaife.
Malingaliro a kampani Shenzhen HDV Photoelectric Technology Co., Ltd.makamaka amapanga zinthu zoyankhulirana.Pakadali pano, zida zomwe zimapangidwa zimakwiriraZithunzi za ONU, Optical module mndandanda, Zithunzi za OLT,nditransceiver mndandanda.Titha kupereka ntchito makonda pazochitika zosiyanasiyana.Mwalandiridwafunsani.
