Kodi pali kusiyana kotani pakati pa ma vector sign ndi RF sign source?

Gwero lazizindikiro litha kupereka zowunikira zolondola komanso zokhazikika kwambiri pazoyeserera zosiyanasiyana zamagulu ndi machitidwe. Jenereta yamagetsi imawonjezera ntchito yolondola yosinthira, yomwe ingathandize kutsanzira chizindikiro cha dongosolo ndikuyesa kuyesa kwa wolandila. Siginecha ya vector ndi gwero la siginecha ya RF zitha kugwiritsidwa ntchito ngati gwero lazizindikiro zoyesa. M'munsimu tili ndi makhalidwe awo pansi kusanthula.
Kodi pali kusiyana kotani pakati pa ma vector sign ndi RF sign source?
1. Chiyambi cha Vector Signal Source
Jenereta ya siginecha ya vekitala idawonekera m'ma 1980, ndipo idagwiritsa ntchito njira yapakatikati yosinthira vekitala yophatikiza ndi njira yosinthira mawayilesi kuti apange chizindikiro chosinthira vekitala. Mfundo yake ndikugwiritsa ntchito kaphatikizidwe kafupipafupi kuti apange chizindikiro cha oscillator cha microwave chokhazikika komanso chizindikiro chokhazikika chapakatikati. Chizindikiro chapakati chapakati ndi siginecha ya baseband imalowa mu moduli ya vekitala kuti ipange chizindikiro chapakatikati chosinthira ma frequency vekitala ndi ma frequency onyamula okhazikika (ma frequency onyamula ndi ma frequency a frequency point). chizindikiro. Chidziwitso cha ma frequency a wayilesi chimakhala ndi chidziwitso chofanana cha baseband monga siginecha yapakatikati yosinthira vekitala. Chizindikiro cha RF chimasinthidwa ndikusinthidwa ndi mawonekedwe a siginecha, kenako chimatumizidwa ku doko lotulutsa kuti litulutsidwe.

Vector signal generator frequency synthesis sub-unit, sub-unit yosinthira ma sigino, makina osinthira analogi ndi zina ndizofanana ndi jenereta wamba wamba. Kusiyana pakati pa jenereta ya siginecha ya vector ndi jenereta wamba wamba ndi gawo losinthira vekitala ndi gawo lopangira ma sign a baseband.

Monga kusintha kwa analogi, kusinthasintha kwa digito kumakhalanso ndi njira zitatu zoyambira, zomwe ndi matalikidwe a matalikidwe, kusintha kwa gawo ndi kusinthasintha pafupipafupi. Vector modulator nthawi zambiri imakhala ndi magawo anayi ogwirira ntchito: gawo lamagetsi lamagetsi la 90 ° gawo-sifting power division unit limatembenuza chizindikiro cha RF kukhala ma siginali awiri a orthogonal RF; mayunitsi awiri osakaniza amasintha chizindikiro cha baseband mu gawo ndi chizindikiro cha quadrature Kuchulukitsa ndi chizindikiro cha RF motsatira; gawo la kaphatikizidwe ka mphamvu limawerengera zizindikiro ziwirizo pambuyo pochulukitsa ndi zotuluka. Nthawi zambiri, madoko onse olowetsa ndi zotuluka amathetsedwa mkati ndi katundu wa 50Ω ndikutengera njira yoyendetsera ma siginecha kuti muchepetse kutayika kwa doko ndikuwongolera magwiridwe antchito a vekitala.

Chigawo chopangira ma siginecha a baseband chimagwiritsidwa ntchito kupanga siginecha ya baseband yofunikira, ndipo mawonekedwe amagetsi operekedwa ndi wogwiritsa ntchito amathanso kutsitsidwa ku kukumbukira kwa waveform kuti apange mtundu wofotokozedwa ndi wogwiritsa ntchito. Makina opanga ma sign a baseband nthawi zambiri amakhala ndi purosesa yophulika, jenereta ya data, jenereta yazizindikiro, fyuluta ya finite impulse response (FIR), resampler ya digito, DAC, ndi fyuluta yomanganso.

2. Chiyambi cha gwero la chizindikiro cha RF
Ukadaulo wamakono wamaphatikizidwe kaphatikizidwe nthawi zambiri umagwiritsa ntchito njira yolumikizira yosalunjika kulumikiza pafupipafupi kwa gwero lalikulu la kugwedezeka komanso kuchuluka kwazomwe zimayambira pafupipafupi kudzera pagawo lotsekeka. Pamafunika zida zochepa za Hardware, kudalirika kwakukulu, komanso ma frequency osiyanasiyana. Pakatikati pake ndi gawo lotsekeka, ndipo gwero la ma siginecha a RF ndi lingaliro lambiri. Nthawi zambiri, gwero lililonse la siginecha lomwe lingapangitse chizindikiro cha RF limatha kukwera pagwero la siginecha ya RF. Magwero aposachedwa a ma vector amakhala mu RF band, motero amatchedwanso magwero a ma vector RF.

Chachitatu, kusiyana pakati pa zizindikiro ziwirizi
1. Chitsimikizo choyera cha ma radio frequency chimangogwiritsidwa ntchito kupanga ma analogi ma frequency radio frequency single frequency siginecha, ndipo nthawi zambiri sagwiritsidwa ntchito kupanga ma siginecha osinthidwa, makamaka ma siginecha osinthidwa adijito. Mtundu woterewu wa magwero amawu nthawi zambiri umakhala ndi bandi yokulirapo komanso mitundu yayikulu yosinthira mphamvu.

2. Gwero la siginecha ya vector limagwiritsidwa ntchito kwambiri popanga ma vekitala, ndiko kuti, ma siginoloji omwe amagwiritsidwa ntchito nthawi zambiri pakulankhulana kwa digito, monga kusinthasintha kwa l / Q: ASK, FSK, MSK, PSK, QAM, makonda I / Q, 3GPPLTE FDD ndi TDD, 3GPPFDD / HSPA / HSPA +, GSM / EDGE / EDGE evolution, TD-SCDMA, WiMAX? Ndipo miyezo ina. Kwa gwero la siginecha ya vekitala, chifukwa cha modulator yake yamkati, ma frequency nthawi zambiri sakhala okwera kwambiri (pafupifupi 6GHz). Mlozera wofananira wa modulator wake (monga bandwidth yolumikizidwa ya baseband) ndi kuchuluka kwa njira zolumikizira ndizofunikira.

Chodzikanira: Nkhaniyi ndi yosindikizidwanso. Cholinga cha nkhaniyi ndikupereka zambiri, ndipo kukopera ndi kwa wolemba woyamba. Ngati makanema, zithunzi, ndi zolemba zomwe zagwiritsidwa ntchito m'nkhaniyi zikukhudzana ndi kukopera, chonde funsani mkonzi kuti athane nazo.