{"id":4759,"date":"2016-02-04T16:17:50","date_gmt":"2016-02-04T09:17:50","guid":{"rendered":"http:\/\/ttud.com.vn\/?p=4759"},"modified":"2017-10-02T11:35:32","modified_gmt":"2017-10-02T04:35:32","slug":"cong-nghe-li-fi-se-thay-the-wi-fi","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/cong-nghe-li-fi-se-thay-the-wi-fi\/","title":{"rendered":"C\u00f4ng ngh\u1ec7 Li-Fi s\u1ebd thay th\u1ebf Wi-Fi?"},"content":{"rendered":"

T\u1eeb nhi\u1ec1u n\u0103m nay, Gi\u00e1o s\u01b0 Vi\u1ec5n th\u00f4ng di \u0111\u1ed9ng Harald Haas \u1edf \u0110H Edinburg, Scotland, \u0111\u00e3 \u1ee7ng h\u1ed9 nhi\u1ec7t t\u00ecnh cho \u00fd t\u01b0\u1edfng truy\u1ec1n d\u1eef li\u1ec7u qua b\u00f3ng \u0111\u00e8n LED v\u00e0 m\u1edbi \u0111\u00e2y, \u00f4ng \u0111\u00e3 bi\u1ec3u di\u1ec5n th\u00e0nh c\u00f4ng vi\u1ec7c truy\u1ec1n m\u1ed9t \u0111o\u1ea1n video t\u1eeb b\u00f3ng \u0111\u00e8n LED sang pin m\u1eb7t tr\u1eddi r\u1ed3i t\u1edbi laptop.<\/strong><\/p>\n

\"\"<\/p>\n

GS Harald Haas v\u1edbi b\u1ed9 truy\u1ec1n v\u00e0 nh\u1eadn d\u1eef li\u1ec7u nh\u1edd \u00e1nh s\u00e1ng trong ph\u00f2ng th\u00ed nghi\u1ec7m c\u1ee7a \u00f4ng \u1edf \u0110H Edinburgh<\/p>\n

Haas gi\u1ea3i th\u00edch: \u201cV\u1ec1 c\u01a1 b\u1ea3n, Li-Fi c\u0169ng t\u01b0\u01a1ng t\u1ef1 nh\u01b0 Wi-Fi, ch\u1ec9 tr\u1eeb m\u1ed9t kh\u00e1c bi\u1ec7t nh\u1ecf: ch\u00fang t\u00f4i s\u1eed d\u1ee5ng \u0111\u00e8n LED \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u kh\u00f4ng d\u00e2y ch\u1ee9 kh\u00f4ng d\u00f9ng s\u00f3ng v\u00f4 tuy\u1ebfn.\u201d<\/p>\n

C\u00f4ng ngh\u1ec7 Wi-Fi truy\u1ec1n th\u1ed1ng s\u1eed d\u1ee5ng t\u00edn hi\u1ec7u v\u00f4 tuy\u1ebfn \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u t\u1edbi c\u00e1c thi\u1ebft b\u1ecb thu nh\u1eadn nh\u01b0 \u0111i\u1ec7n tho\u1ea1i, laptop. Hi\u1ec7n nay Wi-Fi chi\u1ebfm t\u1edbi kho\u1ea3ng m\u1ed9t n\u1eeda kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u truy\u1ec1n t\u1ea3i tr\u00ean Internet tr\u00ean to\u00e0n th\u1ebf gi\u1edbi. Theo d\u1ef1 \u0111o\u00e1n, t\u1ec9 l\u1ec7 n\u00e0y c\u00f2n cao h\u01a1n n\u1eefa trong nh\u1eefng n\u0103m t\u1edbi do l\u01b0\u1ee3ng ng\u01b0\u1eddi ti\u1ebfp c\u1eadn Internet gia t\u0103ng v\u00e0 \u201cInternet c\u1ee7a V\u1ea1n v\u1eadt\u201d m\u1edf r\u1ed9ng. \u0110i\u1ec1u n\u00e0y khi\u1ebfn m\u1ed9t s\u1ed1 chuy\u00ean gia lo ng\u1ea1i v\u00ec n\u00f3 s\u1ebd g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng \u201cspectrum crunch\u201d (v\u1ee1 ph\u1ed5 s\u00f3ng) khi c\u00e1c m\u1ea1ng Wi-Fi b\u1ecb ch\u1eadm l\u1ea1i do qu\u00e1 t\u1ea3i. V\u00ec th\u1ebf, Haas \u0111\u00e3 ngh\u0129 \u0111\u1ebfn \u00fd t\u01b0\u1edfng truy\u1ec1n d\u1eef li\u1ec7u ph\u1ed5 \u00e1nh s\u00e1ng nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c.<\/p>\n

Th\u1ef1c ra \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t \u00fd t\u01b0\u1edfng m\u1edbi. N\u0103m 1880, Alexander Graham Bell \u0111\u00e3 truy\u1ec1n \u00e2m thanh th\u00f4ng qua m\u1ed9t tia s\u00e1ng m\u1eb7t tr\u1eddi b\u1eb1ng m\u00e1y quang tho\u1ea1i. V\u00e0i th\u1eadp k\u1ef7 g\u1ea7n \u0111\u00e2y, m\u1ed9t s\u1ed1 nh\u00e0 nghi\u00ean c\u1ee9u c\u0169ng \u0111\u00e3 b\u1eaft tay v\u00e0o t\u00ecm hi\u1ec3u vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u b\u1eb1ng \u00e1nh s\u00e1ng nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c.<\/p>\n

Nh\u01b0ng \u0111i\u1ec3m kh\u00e1c bi\u1ec7t \u1edf d\u1ef1 \u00e1n c\u1ee7a Haas l\u00e0 \u00f4ng ch\u1ec9 \u0111\u01a1n gi\u1ea3n s\u1eed d\u1ee5ng b\u00f3ng \u0111\u00e8n LED \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u. B\u00f3ng \u0111\u00e8n LED s\u1eed d\u1ee5ng m\u1ed9t b\u1ed9 \u0111i\u1ec1u khi\u1ec3n c\u00f3 th\u1ec3 nhanh ch\u00f3ng \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng ho\u1eb7c b\u1eadt\/t\u1eaft b\u00f3ng. Do \u0111\u00f3, Haas cho r\u1eb1ng c\u00f3 th\u1ec3 m\u00e3 h\u00f3a d\u1eef li\u1ec7u v\u00e0o qu\u00e1 tr\u00ecnh thay \u0111\u1ed5i \u0111\u1ed9 s\u00e1ng c\u1ee7a b\u00f3ng \u0111\u00e8n \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u m\u00e0 m\u1eaft th\u01b0\u1eddng kh\u00f4ng c\u1ea3m nh\u1eadn \u0111\u01b0\u1ee3c.<\/p>\n

K\u1ebft qu\u1ea3 m\u1ed9t s\u1ed1 th\u00ed nghi\u1ec7m g\u1ea7n \u0111\u00e2y cho th\u1ea5y, Li-Fi c\u00f3 t\u1ed1c \u0111\u1ed9 nhanh h\u01a1n Wi-Fi, th\u1eadm ch\u00ed c\u00f3 l\u00fac \u0111\u1ea1t t\u1edbi t\u1ed1c \u0111\u1ed9 224 gigabit\/gi\u00e2y. V\u1edbi t\u1ed1c \u0111\u1ed9 n\u00e0y, m\u1ed9t ng\u01b0\u1eddi c\u00f3 th\u1ec3 t\u1ea3i 20 b\u1ed9 phim ho\u00e0n ch\u1ec9nh v\u1ec1 m\u00e1y ch\u1ec9 trong m\u1ed9t gi\u00e2y. Theo nghi\u00ean c\u1ee9u c\u1ee7a Haas, s\u1edf d\u0129 Li-Fi c\u00f3 th\u1ec3 \u0111\u1ea1t m\u1eadt \u0111\u1ed9 d\u1eef li\u1ec7u nhi\u1ec1u g\u1ea5p 1.000 l\u1ea7n so v\u1edbi Wi-Fi l\u00e0 b\u1edfi v\u00ec t\u00edn hi\u1ec7u Li-Fi \u0111\u01b0\u1ee3c ch\u1ee9a trong m\u1ed9t khu v\u1ef1c nh\u1ecf trong khi t\u00edn hi\u1ec7u v\u00f4 tuy\u1ebfn l\u1ea1i khu\u1ebfch t\u00e1n.<\/p>\n

Ngo\u00e0i t\u1ed1c \u0111\u1ed9, Li-Fi c\u00f2n an to\u00e0n h\u01a1n. Trong khi t\u00edn hi\u1ec7u Wi-Fi c\u00f3 th\u1ec3 \u0111i qua t\u01b0\u1eddng (t\u1ee9c l\u00e0 h\u00e0ng x\u00f3m c\u00f3 th\u1ec3 \u201cchia s\u1ebb\u201d \u0111\u01b0\u1eddng truy\u1ec1n) th\u00ec t\u00edn hi\u1ec7u Li-Fi \u0111\u01b0\u1ee3c gi\u1eef trong nh\u00e0 ch\u1ec9 b\u1eb1ng m\u1ed9t thao t\u00e1c \u0111\u01a1n gi\u1ea3n l\u00e0 k\u00e9o r\u00e8m c\u1eeda l\u1ea1i. Theo Haas, c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ec3 b\u00f3ng \u0111\u00e8n \u1edf \u0111\u1ed9 s\u00e1ng th\u1ea5p nh\u1ea5t m\u00e0 v\u1eabn truy\u1ec1n t\u1ea3i \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u.<\/p>\n

Hi\u1ec7n nay c\u00f4ng ty pureLiFi c\u1ee7a Haas \u0111\u00e3 b\u1eaft \u0111\u1ea7u s\u1ea3n xu\u1ea5t h\u00e0ng lo\u1ea1t b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn Li-Fi cho m\u1ed9t s\u1ed1 kh\u00e1ch h\u00e0ng doanh nghi\u1ec7p. H\u1ecd hy v\u1ecdng s\u1ebd \u0111\u01b0a c\u00f4ng ngh\u1ec7 n\u00e0y ra th\u1ecb tr\u01b0\u1eddng \u0111\u1ea1i ch\u00fang trong m\u1ed9t hai n\u0103m s\u1eafp t\u1edbi. H\u1ec7 th\u1ed1ng c\u1ee7a h\u1ecd c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng k\u1ebft n\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb n\u00e0o th\u00f4ng qua m\u1ed9t b\u00f3ng \u0111\u00e8n LED, nh\u01b0 v\u1eady, t\u1ed1c \u0111\u1ed9 ph\u00e1t tri\u1ec3n c\u1ee7a IoT c\u00f3 th\u1ec3 s\u1ebd \u0111\u01b0\u1ee3c th\u00fac \u0111\u1ea9y nhanh h\u01a1n.<\/p>\n

Tuy nhi\u00ean, m\u1ed9t s\u1ed1 nh\u00e0 khoa h\u1ecdc cho r\u1eb1ng c\u00f4ng ngh\u1ec7 Li-Fi c\u00f2n ph\u1ea3i v\u01b0\u1ee3t qua kh\u00f4ng \u00edt r\u00e0o c\u1ea3n tr\u01b0\u1edbc khi tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n thi\u1ebft y\u1ebfu trong cu\u1ed9c s\u1ed1ng. M\u1ed9t trong nh\u1eefng r\u00e0o c\u1ea3n \u0111\u01b0\u1ee3c nh\u1eafc \u0111\u1ebfn l\u00e0 Li-Fi s\u1ebd y\u1ebfu \u0111i khi \u00e1nh s\u00e1ng b\u1ecb ch\u1eb7n, do s\u01b0\u01a1ng m\u00f9 hay c\u00e1c \u0111i\u1ec1u ki\u1ec7n ngo\u1ea1i c\u1ea3nh kh\u00e1c. D\u1eabu sao, ng\u00e0nh c\u00f4ng nghi\u1ec7p Li-Fi c\u0169ng \u0111\u01b0\u1ee3c d\u1ef1 \u0111o\u00e1n l\u00e0 s\u1ebd \u0111\u1ea1t gi\u00e1 tr\u1ecb 6 t\u1ec9 USD v\u00e0o n\u0103m 2018.<\/p>\n

Ngo\u00e0i nh\u00f3m c\u1ee7a Haas, m\u1ed9t s\u1ed1 nh\u00f3m nghi\u00ean c\u1ee9u kh\u00e1c c\u0169ng \u0111ang b\u1eaft tay v\u00e0o ph\u00e1t tri\u1ec3n c\u00f4ng ngh\u1ec7 Li-Fi, ch\u1eb3ng h\u1ea1n nh\u01b0 nh\u00f3m c\u00e1c nh\u00e0 khoa h\u1ecdc Trung Qu\u1ed1c, Vi\u1ec7n Fraunhofer c\u1ee7a \u0110\u1ee9c, th\u1eadm ch\u00ed c\u1ea3 NASA c\u0169ng \u0111ang v\u00e0o cu\u1ed9c.<\/p>\n

Trang Bui<\/em>
\n http:\/\/tiasang.com.vn<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

T\u1eeb nhi\u1ec1u n\u0103m nay, Gi\u00e1o s\u01b0 Vi\u1ec5n th\u00f4ng di \u0111\u1ed9ng Harald Haas \u1edf \u0110H Edinburg, Scotland, \u0111\u00e3 \u1ee7ng h\u1ed9 nhi\u1ec7t t\u00ecnh cho \u00fd t\u01b0\u1edfng truy\u1ec1n d\u1eef li\u1ec7u qua b\u00f3ng \u0111\u00e8n LED v\u00e0 m\u1edbi \u0111\u00e2y, \u00f4ng \u0111\u00e3 bi\u1ec3u di\u1ec5n th\u00e0nh c\u00f4ng vi\u1ec7c truy\u1ec1n m\u1ed9t \u0111o\u1ea1n video t\u1eeb b\u00f3ng \u0111\u00e8n LED sang pin m\u1eb7t tr\u1eddi r\u1ed3i t\u1edbi […]<\/p>\n","protected":false},"author":17,"featured_media":5286,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-4759","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"_links":{"self":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4759","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/comments?post=4759"}],"version-history":[{"count":2,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4759\/revisions"}],"predecessor-version":[{"id":5287,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4759\/revisions\/5287"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media\/5286"}],"wp:attachment":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media?parent=4759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/categories?post=4759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/tags?post=4759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}