{"id":6765,"date":"2023-08-25T00:00:00","date_gmt":"2023-08-25T00:00:00","guid":{"rendered":"https:\/\/tech-lib.eu\/tech\/technologie-cdma-jak-funguje-a-jeji-vyhody\/"},"modified":"2023-08-25T00:00:00","modified_gmt":"2023-08-25T00:00:00","slug":"technologie-cdma-jak-funguje-a-jeji-vyhody","status":"publish","type":"post","link":"https:\/\/tech-lib.eu\/tech\/technologie-cdma-jak-funguje-a-jeji-vyhody\/","title":{"rendered":"Technologie CDMA. Jak funguje a jej\u00ed v\u00fdhody"},"content":{"rendered":"<div class=\"articlecontent\">Code Division several Access neboli CDMA je digit\u00e1ln\u00ed mobiln\u00ed technologie, kter\u00e1 umo\u017e\u0148uje n\u011bkolika u\u017eivatel\u016fm sou\u010dasn\u011b sd\u00edlet stejn\u00e9 frekven\u010dn\u00ed spektrum. V tomto p\u0159\u00edsp\u011bvku se pod\u00edv\u00e1me na to, jak CDMA funguje, jak ji telefony pou\u017e\u00edvaj\u00ed k vol\u00e1n\u00ed, \u010d\u00edm se li\u0161\u00ed od GSM, pro\u010d je lep\u0161\u00ed ne\u017e GSM a jak\u00e9 jsou jej\u00ed kl\u00ed\u010dov\u00e9 vlastnosti. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Technologie CDMA vyu\u017e\u00edv\u00e1 techniky rozprost\u0159en\u00e9ho spektra, kter\u00e9 umo\u017e\u0148uj\u00ed mnoha u\u017eivatel\u016fm sou\u010dasn\u011b odes\u00edlat a p\u0159ij\u00edmat data ve stejn\u00e9m frekven\u010dn\u00edm rozsahu. Nam\u00edsto TDMA nebo FDMA, co\u017e jsou techniky pou\u017e\u00edvan\u00e9 v GSM, CDMA d\u00e1v\u00e1 ka\u017ed\u00e9mu u\u017eivateli speci\u00e1ln\u00ed k\u00f3d, kter\u00fd umo\u017e\u0148uje rozpoznat jejich sign\u00e1ly od sebe navz\u00e1jem. Pr\u00e1v\u011b funkce d\u011blen\u00ed k\u00f3du odli\u0161uje CDMA od ostatn\u00edch syst\u00e9m\u016f. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Telefon CDMA p\u0159ev\u00e1d\u00ed zvukov\u00fd nebo datov\u00fd p\u0159enos do digit\u00e1ln\u00ed podoby a p\u0159i uskute\u010dn\u011bn\u00ed hovoru jej zak\u00f3duje speci\u00e1ln\u00edm k\u00f3dem. Tento zak\u00f3dovan\u00fd sign\u00e1l je dod\u00e1v\u00e1n sou\u010dasn\u011b se sign\u00e1ly ostatn\u00edch u\u017eivatel\u016f v \u0161irok\u00e9m frekven\u010dn\u00edm p\u00e1smu. K odd\u011blen\u00ed po\u017eadovan\u00e9ho sign\u00e1lu od p\u0159ij\u00edman\u00e9 sm\u011bsi sign\u00e1l\u016f na p\u0159ij\u00edmac\u00ed stran\u011b pou\u017e\u00edv\u00e1 p\u0159ij\u00edma\u010d stejn\u00fd rozli\u0161ovac\u00ed k\u00f3d. D\u00edky tomuto dek\u00f3dovac\u00edmu postupu m\u016f\u017ee v\u00edce u\u017eivatel\u016f pou\u017e\u00edvat stejn\u00e9 frekven\u010dn\u00ed p\u00e1smo, ani\u017e by se navz\u00e1jem ru\u0161ili. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Ve srovn\u00e1n\u00ed s GSM m\u00e1 CDMA \u0159adu v\u00fdhod. Kl\u00ed\u010dovou v\u00fdhodou je jeho schopnost pojmout v\u00edce u\u017eivatel\u016f v dan\u00e9m frekven\u010dn\u00edm p\u00e1smu. Proto\u017ee CDMA umo\u017e\u0148uje v\u00edce sou\u010dasn\u00fdch spojen\u00ed, zvy\u0161uje se kapacita s\u00edt\u011b. Nav\u00edc d\u00edky odli\u0161n\u00e9mu k\u00f3dov\u00e1n\u00ed sign\u00e1lu, kter\u00e9 sni\u017euje ru\u0161en\u00ed a \u0161um, s\u00edt\u011b CDMA obvykle nab\u00edzej\u00ed vy\u0161\u0161\u00ed kvalitu hovor\u016f a vy\u0161\u0161\u00ed \u010distotu hlasu. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Dal\u0161\u00ed v\u00fdhodou je lep\u0161\u00ed zabezpe\u010den\u00ed s\u00edt\u00ed CDMA. Ve srovn\u00e1n\u00ed s GSM nab\u00edz\u00ed tato technologie vy\u0161\u0161\u00ed \u00farove\u0148 zabezpe\u010den\u00ed, proto\u017ee sign\u00e1l ka\u017ed\u00e9ho u\u017eivatele je opat\u0159en jedine\u010dn\u00fdm k\u00f3dov\u00e1n\u00edm, kter\u00e9 zt\u011b\u017euje neopr\u00e1vn\u011bn\u00fdm u\u017eivatel\u016fm zachycen\u00ed nebo dek\u00f3dov\u00e1n\u00ed p\u0159en\u00e1\u0161en\u00fdch dat. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Schopnost CDMA zvl\u00e1dat jemn\u00e9 p\u0159ed\u00e1v\u00e1n\u00ed je jednou z jej\u00edch hlavn\u00edch vlastnost\u00ed. Kdy\u017e mobiln\u00ed za\u0159\u00edzen\u00ed p\u0159ech\u00e1z\u00ed mezi dv\u011bma z\u00e1kladnov\u00fdmi stanicemi, zat\u00edmco st\u00e1le prob\u00edh\u00e1 stejn\u00fd hovor, je takov\u00fd p\u0159echod zn\u00e1m jako jemn\u00e9 p\u0159ed\u00e1n\u00ed. Pomoc\u00ed CDMA lze hovor snadno p\u0159en\u00e9st z jedn\u00e9 z\u00e1kladnov\u00e9 stanice na druhou, co\u017e zaji\u0161\u0165uje nep\u0159etr\u017eitou slu\u017ebu a vy\u0161\u0161\u00ed spolehlivost hovoru. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee technologie CDMA umo\u017e\u0148uje mnoha u\u017eivatel\u016fm sou\u010dasn\u011b sd\u00edlet stejn\u00e9 frekven\u010dn\u00ed spektrum pomoc\u00ed technik v\u00edcen\u00e1sobn\u00e9ho p\u0159\u00edstupu s d\u011blen\u00edm k\u00f3du. Pomoc\u00ed odli\u0161n\u00fdch k\u00f3d\u016f \u0161ifruj\u00ed telefony CDMA sv\u00e9 sign\u00e1ly zp\u016fsobem, kter\u00fd usnad\u0148uje odd\u011blen\u00ed a dek\u00f3dov\u00e1n\u00ed jednotliv\u00fdch sign\u00e1l\u016f. Zv\u00fd\u0161en\u00e1 kapacita s\u00edt\u011b, lep\u0161\u00ed kvalita hovor\u016f, vy\u0161\u0161\u00ed bezpe\u010dnost a mo\u017enost \u0161etrn\u00e9ho p\u0159ed\u00e1v\u00e1n\u00ed hovor\u016f jsou jen n\u011bkter\u00e9 v\u00fdhody, kter\u00e9 CDMA nab\u00edz\u00ed. D\u00edky t\u011bmto vlastnostem je CDMA silnou a spolehlivou mobiln\u00ed technologi\u00ed, kter\u00e1 se st\u00e1le pou\u017e\u00edv\u00e1 v mnoha s\u00edt\u00edch po cel\u00e9m sv\u011bt\u011b.<\/p><\/div>\n<div class=\"questions\">\n<div class=\"questionstitle\">FAQ<\/div>\n<div class=\"question\">\n<div class=\"qtitle\"> Pou\u017e\u00edv\u00e1 CDMA kartu SIM?<\/div>\n<p> Ne, karty SIM (Subscriber Identity Module) se u technologie CDMA (Code Division Multiple Access) nepou\u017e\u00edvaj\u00ed. Na rozd\u00edl od technologie GSM (Global System for Mobile Communications), kter\u00e1 ukl\u00e1d\u00e1 \u00fadaje o \u00fa\u010dastn\u00edc\u00edch na karty SIM, pou\u017e\u00edv\u00e1 CDMA jin\u00fd p\u0159\u00edstup k ov\u011b\u0159ov\u00e1n\u00ed a identifikaci u\u017eivatel\u016f v s\u00edti. V syst\u00e9mu CDMA je ka\u017ed\u00e9mu u\u017eivateli p\u0159id\u011blen speci\u00e1ln\u00ed k\u00f3d, kter\u00fd umo\u017e\u0148uje mnoha u\u017eivatel\u016fm sou\u010dasn\u011b sd\u00edlet stejn\u00e9 frekven\u010dn\u00ed spektrum. Tento k\u00f3d slou\u017e\u00ed k rozli\u0161en\u00ed n\u011bkolika u\u017eivatel\u016f a usnadn\u011bn\u00ed komunikace. <\/p>\n<\/div>\n<div class=\"question\">\n<div class=\"qtitle\"> Pou\u017e\u00edv\u00e1 CDMA LTE?<\/div>\n<p> Ne, LTE (Long-Term Evolution) a CDMA (Code Division Multiple Access) jsou r\u016fzn\u00e9 technologie mobiln\u00ed komunikace. Zat\u00edmco LTE je technologie vyu\u017e\u00edvan\u00e1 v s\u00edt\u00edch 4G a 5G, CDMA je technologie pou\u017e\u00edvan\u00e1 v d\u0159\u00edv\u011bj\u0161\u00edch s\u00edt\u00edch 2G a 3G. Za\u0159\u00edzen\u00ed vyroben\u00e1 pro s\u00edt\u011b CDMA nelze pou\u017e\u00edvat v s\u00edt\u00edch LTE a naopak, proto\u017ee CDMA a LTE jsou nekompatibiln\u00ed. <\/p>\n<\/div>\n<div class=\"question\">\n<div class=\"qtitle\"> Pou\u017e\u00edv\u00e1 CDMA IMEI?<\/div>\n<p> Ne, IMEI (International Mobile Equipment Identity) se u technologie CDMA (Code Division Multiple Access) nepou\u017e\u00edv\u00e1. Glob\u00e1ln\u00ed syst\u00e9m pro mobiln\u00ed komunikace (GSM) pou\u017e\u00edv\u00e1 k identifikaci konkr\u00e9tn\u00edch mobiln\u00edch telefon\u016f jedine\u010dn\u00fd identifik\u00e1tor IMEI. Elektronick\u00e9 s\u00e9riov\u00e9 \u010d\u00edslo neboli ESN je odli\u0161n\u00e1 technika identifikace za\u0159\u00edzen\u00ed, kterou pou\u017e\u00edvaj\u00ed v\u00fdhradn\u011b s\u00edt\u011b CDMA.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Code Division several Access neboli CDMA je digit\u00e1ln\u00ed mobiln\u00ed technologie, kter\u00e1 umo\u017e\u0148uje n\u011bkolika u\u017eivatel\u016fm sou\u010dasn\u011b sd\u00edlet stejn\u00e9 frekven\u010dn\u00ed spektrum. V tomto p\u0159\u00edsp\u011bvku se pod\u00edv\u00e1me na to, jak CDMA funguje, jak ji telefony pou\u017e\u00edvaj\u00ed k vol\u00e1n\u00ed, \u010d\u00edm se li\u0161\u00ed od GSM, pro\u010d je lep\u0161\u00ed ne\u017e GSM a jak\u00e9 jsou jej\u00ed kl\u00ed\u010dov\u00e9 vlastnosti. Technologie CDMA vyu\u017e\u00edv\u00e1 techniky &#8230; <a title=\"Technologie CDMA. Jak funguje a jej\u00ed v\u00fdhody\" class=\"read-more\" href=\"https:\/\/tech-lib.eu\/tech\/technologie-cdma-jak-funguje-a-jeji-vyhody\/\" aria-label=\"\u010c\u00edst v\u00edce o Technologie CDMA. Jak funguje a jej\u00ed v\u00fdhody\">\u010c\u00edst d\u00e1l<\/a><\/p>\n","protected":false},"author":3591,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2686],"tags":[],"class_list":["post-6765","post","type-post","status-publish","format-standard","hentry","category-technologie-cdma"],"_links":{"self":[{"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/posts\/6765","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/users\/3591"}],"replies":[{"embeddable":true,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/comments?post=6765"}],"version-history":[{"count":0,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/posts\/6765\/revisions"}],"wp:attachment":[{"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/media?parent=6765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/categories?post=6765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/tags?post=6765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}