Niaj hnub nimno telecommunications - ib tug ceev ceev kev twb kev txuas

Lub telecommunications lag luam yog ib qho ntawm feem pheej thiab pheej loj fastest qhov chaw ntawm lub telecommunications lag luam. Tam sim no, sib txuas lus system yog nyob rau hauv txoj kev ceev txoj kev loj hlob, nyob rau hauv Feem ntau, nws yog teem rau lub Lavxias teb sab kev sib txuas lus system nkag mus rau hauv lub ntiaj teb no raws li ib tug sib npaug zos khub los muab kev pab cuam ntawm thoob ntiaj teb, nyob deb, lub nroog, cov ntaub ntawv, hauv internet, mobile, thiab lwm yam ..

Yuav ua li cas yog lub Telecommunications

Lub sij hawm "telecommunication" yog muab los ntawm cov lus: communico Latin, uas txhais tau tias "daim ntawv ntawm kev sib txuas lus," thiab lub Greek tele, lub ntsiab lus "yeeb yam ntawm ib tug deb deb."

Yog li ntawd, peb yuav hais tias:

• Telecommunications - ib tug sau ntawm pab kiag li lawm thiab cov kev pab cuam mus rau kis cov lus qhia ntawm cable thiab xov tooj cua raws. Cov ntaub ntawv no hloov dua siab tshiab ntaus ntawv, nws seev suab, tes taws los piav; Qhov no advanced computer ua technology.
• Telecommunications khoom - ib tug txheej ntawm kev, software thiab lub koom haum txhais tau tias rau cov kis ntawm cov ntaub ntawv tshaj ntev ncua kev. khoom-lub xeev tso zis amplifiers yog siv los tsim cov satellite chaw nres tsheb transmitters.
• Telecommunications - tso cai Service Center muaj peev xwm sawv ntawm kis thiab tau txais cov lus. Tshwj xeeb nyob rau hauv telecommunications - technicians thiab engineers. Lawv mas ua hauj lwm nrog cov lis dej num, Pib ntsais koj teeb, suab nrov.
• Telecommunications - yog cov kev pauv ntawm tej ntaub ntawv nrog rau cov kev pab los ntawm ib lub computer. Cov ntaub ntawv yog kis tau los ntawm cov kev sib txuas lus raws los yog cov lus qhia pauv.
• Telecommunications - yog txoj kev txais thiab ua ntaub ntawv siv tshuab hluav taws xob, network, electromagnetic, cov ntaub ntawv thiab computer technologies.

Pheej chaw ntawm telecommunications yees yuav tsum tau yog:

1. Tsim tshiab lub teeb liab-code lug ntawm kev siv ua ke hom kev kawm ntawm manipulation Pib ntsais koj teeb thiab tshiab teeb liab encoding hom kev kawm los ua kom bandwidth thiab kis tau tus mob systems los txhim kho lawv lub hwj chim.
2. Tsim ib tug ntse kav hlau txais xov li nrog paub lub hwj chim.
3. Creation ntawm telecommunication systems nyob rau hauv lub millimeter yoj band nrog ib tug ua hauj lwm zaus ntawm kwv yees li 100 GHz.
4. Kev loj hlob ntawm txoj kev thiab yees ntawm telecommunications khoom, uas saib kuas lawv pom kev ntawm ib tug generalized no: qhov tsawg kawg nkaus tus nqi, nyiaj pab ntau tshaj tsis, ntau cia siab rau, yam tsawg kawg nkaus qhov hnyav thiab loj yam ntxwv.
5. Ua lub theem ntawm txoj kev kawm ntawm cov tub ntxhais kawm nyob rau hauv cov kev taw qhia ntawm "Telecommunications", lub expansion ntawm kev tshawb fawb thiab kev loj hlob nyob rau hauv cov kev taw qhia.

Ib tug teeb liab encoding txoj kev Technology

Rau kev pom kev zog tshuab siv lub newest txoj kev encoding thiab teeb liab tes taws los piav. Hais tias lub teeb liab coding hom kev kawm rau tshwj kom txhob raug nyob rau hauv lub cuam tej yam kev mob, kev ua muab lub zog nce ntawm lub cev mus 6.8 dB, txawm tias kis spectrum teeb liab. Nws yuav siv thaiv cov lis dej num: Hamming lis dej num, Reed-Solomon, BCH thiab convolutional codes tsob ntoo. Ib tug interesting siv cov lis dej num yog tsim nyog los xav txog tias pub kom paub voos amplitude theem ua haujlwm Keying thiab li tau ntxiv coding nce mus nce lub teeb liab kis tau tus mob ceev. Nyob rau hauv rooj plaub no tus channel bandwidth siv multi-txoj hauj lwm txheeb ze theem ua haujlwm Keying thiab quadrature amplitude theem ua haujlwm Keying.

satellite kev sib txuas lus

Satellite kev sib txuas lus tshuab yog siv nyob rau hauv geostationary satellites rau cov kis ntawm cov TV cov kev pab cuam, xws li ib tug neeg uas txais txiaj ntsim thiab software pab pawg neeg cov ntaub ntawv tsheb. Ntawm kev ceeb toom yog lub thoob ntiaj teb system ntawm Inmarsat satellite marine navigation, uas, Ntxiv, tau txais ntau coj mus muag siv rau ceev ceev kev sib txuas lus thiab navigation siv ib tug GPS satellite navigation system nyob rau hauv tej thaj chaw deb chaw, thaum muaj xwm ceev, raws li zoo raws li rau cov saib xyuas ntawm freight tsheb. Compact satellite xov tooj tso cai hloov lwm lub tsev ntawm cov ntaub ntawv los ntawm txhua qhov chaw nyob rau hauv lub ntiaj teb no. Nyob rau hauv ua ke nrog nrog ib tug broadband pseudo suab nrov teeb liab tshiab technologies tau siv: zaus microstrip kav hlau txais xov, ib tug khoom hauv lub xeev hwj chim amplifier, ib tug dual channel lim nyob rau hauv tus nto acoustic yoj raws li Bismuth germanate, narrowband microwave cov ntxaij lim dej nyob rau hauv dielectric resonators, thiab lwm yam ..

telecommunications txhais tau tias

Niaj hnub no, tshwj xeeb tshaj yog cov ceev ceev txoj kev loj hlob ntawm mobile sib txuas lus tau uas tau txais, lub xov tooj ntawm cov neeg rau npe uas nyob rau hauv ntau lub teb chaws tshaj cov xov tooj ntawm tsau network subscribers. Raws li ntev superiority nyob rau hauv lub mobile lag luam tuas GSM-900 txheem / 180, uas lub system mus txog cov kev txwv ntawm perfection los ntawm kev siv ntawm GPRS thiab NTUG tseeb technology. Heev pheej yuav tsum raug xam tias yog raws li ib tug mobile sib txuas lus system nrog code division ntawm CDMA raws uas yog unmatched tus kheej thiab lub zog ua tau zoo. Niaj hnub no, los ua ib tug 3G mobile sib txuas lus system nyob rau hauv raws li cov txheej txheem thiab MT-2000, tsim los ntawm lub International Telecommunication Union, siv peb txuj raws li CDMA technology: CDMA IB, CDMA 2000 thiab WCDMA. Raws li ib feem ntawm lub IMT-2000 qauv, tej hauj lwm rau creation ntawm satellite tus kheej mobile sib txuas lus Orbocomm, Thuraya, Clobal Star, Iridium. Thaum coj mus muag lag luam ntawm lub twb tsis tau tiav vim cov teeb meem ntawm nyiaj txiag ntawm tej yaam num thiab kev teeb meem. Rau cov lus qhia networking tuam txhab uas muag yog zoo pov thawj lub xov tooj cua system DECT.

Fast teeb liab kis tau tus mob system

Tsaug rau kev kho nyob rau hauv microelectronics technology, manufactured thiab siv hnub no lub mobile thiab computer-networking thiab telecommunications, xws li Bluetooth, ZigBee, WiMax, WiFi thiab lwm tus neeg. Nyob rau hauv kev xyaum, cov kev siv ntawm txawv kis tau tus mob systems, uas yog tsim siv ntau cov ntsiab cai thiab schemes ntawm kev tsim kho thiab sib txawv channel adapters mus cuag mus rau lub sib nug xov kis tau tus mob raws. Hydroacoustic kev sib txuas lus system sib txuas lus nyob rau hauv dej siv ultrasonic deeg nyob rau hauv lub 8-20 kHz ntawm ib tug deb ntawm 4 km. Laser kev sib txuas lus tshuab siv lasers nrog ib tug wavelength ntawm 1-10 microns, thiab siv nyob rau hauv qhov chaw mus. Ryazan ntsuas ua tsob nroj (Russia) manufactured laser transceiver ntaus ntawv muab lub teeb liab kis tau tus mob npaum li cas ntawm 200 txog Mbit / sec tshaj ib tug deb ntawm 2-10 km terrestrial tej yam kev mob thiab siv piv rau kis ntaub ntawv ntawm lub hauv paus chaw nres tsheb nyob rau hauv mobile sib txuas lus. Kev sib txuas lus tshuab nyob rau hauv ntau thiab underground siv leaky (kav hlau txais xov) cable, e.g., EUPEN npe nyob rau hauv lub ntau zaus 30-1800 MHz. US zaum tsim tau kis ntawm xov tooj cua tsis gektametrovogo ntau nyob rau hauv lub bowels ntawm lub ntiaj teb. Nws yog ntseeg hais tias thaum lub sij hawm qhov kev tso kawm ntawm transponders nyob rau hauv lub cheeb tsam ntawm mus txog 200 m yuav tau tsim ib tug kev sib txuas lus txuas rau kis ib lub teeb liab nrog lub spectrum li 500 Hz.