{"id":4436,"date":"2025-09-22T11:12:00","date_gmt":"2025-09-22T11:12:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/what-is-sc-fdma-and-why-important-for-lte-uplink\/"},"modified":"2026-06-22T06:49:02","modified_gmt":"2026-06-22T06:49:02","slug":"what-is-sc-fdma-and-why-important-for-lte-uplink","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-sc-fdma-and-why-important-for-lte-uplink","title":{"rendered":"SC-FDMA L\u00e0 G\u00ec V\u00e0 V\u00ec Sao N\u00f3 Quan Tr\u1ecdng \u0110\u1ed1i V\u1edbi Li\u00ean K\u1ebft L\u00ean (Uplink) C\u1ee7a LTE?"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1312\" height=\"736\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5f8b23c0f97c42ac8ef51d1152cd9ffe.webp\" alt=\"What is SC-FDMA and Why Is It Important for LTE Uplink\" class=\"wp-image-4434\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5f8b23c0f97c42ac8ef51d1152cd9ffe.webp 1312w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5f8b23c0f97c42ac8ef51d1152cd9ffe-300x168.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5f8b23c0f97c42ac8ef51d1152cd9ffe-1024x574.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5f8b23c0f97c42ac8ef51d1152cd9ffe-768x431.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5f8b23c0f97c42ac8ef51d1152cd9ffe-18x10.webp 18w\" sizes=\"(max-width: 1312px) 100vw, 1312px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n \u0111\u00e3 bao gi\u1edd t\u1ea3i l\u00ean m\u1ea1ng x\u00e3 h\u1ed9i m\u1ed9t video \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao t\u1eeb \u0111i\u1ec7n tho\u1ea1i v\u00e0 t\u1ef1 h\u1ecfi v\u1ec1 c\u00f4ng ngh\u1ec7 khi\u1ebfn qu\u00e1 tr\u00ecnh n\u00e0y tr\u1edf n\u00ean hi\u1ec7u qu\u1ea3 \u0111\u1ebfn th\u1ebf ch\u01b0a? \u0110\u1eb1ng sau tr\u1ea3i nghi\u1ec7m m\u01b0\u1ee3t m\u00e0 \u0111\u00f3 l\u00e0 m\u1ed9t \u0111\u1ed5i m\u1edbi then ch\u1ed1t nh\u01b0ng th\u01b0\u1eddng b\u1ecb b\u1ecf qua: <strong>Truy c\u1eadp \u0111a \u0111i\u1ec3m ph\u00e2n chia t\u1ea7n s\u1ed1 \u0111\u01a1n mang (SC-FDMA)<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong khi ng\u01b0\u1eddi anh em c\u1ee7a n\u00f3, OFDMA, chi\u1ebfm ph\u1ea7n l\u1edbn vinh quang cho \u0111\u01b0\u1eddng xu\u1ed1ng 5G v\u00e0 LTE 4G, th\u00ec SC-FDMA l\u1ea1i l\u00e0 \u201ccon ng\u1ef1a th\u1ed3\u201d \u00e2m th\u1ea7m \u0111\u1ea3m nhi\u1ec7m \u0111\u01b0\u1eddng l\u00ean. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd \u0111i s\u00e2u v\u00e0o SC-FDMA l\u00e0 g\u00ec, v\u00ec sao n\u00f3 thi\u1ebft y\u1ebfu \u0111\u1ed1i v\u1edbi vi\u1ec5n th\u00f4ng di \u0111\u1ed9ng hi\u1ec7n \u0111\u1ea1i, v\u00e0 c\u00e1ch n\u00f3 k\u1ebft n\u1ed1i v\u1edbi ph\u1ea7n c\u1ee9ng l\u00e0m n\u00ean t\u1ea5t c\u1ea3 \u0111i\u1ec1u \u0111\u00f3, bao g\u1ed3m c\u1ea3 <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\"><strong>C\u00e1c c\u00f4ng ty nh\u01b0<\/strong><\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udcc4 SC-FDMA l\u00e0 g\u00ec? Kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SC-FDMA l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111i\u1ec1u ch\u1ebf s\u1ed1 v\u00e0 truy c\u1eadp \u0111a \u0111i\u1ec3m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ch\u1ee7 y\u1ebfu cho <strong>\u0111\u01b0\u1eddng l\u00ean c\u1ee7a 5G v\u00e0 LTE<\/strong> (t\u1eeb thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n t\u1edbi tr\u1ea1m g\u1ed1c). M\u1ee5c ti\u00eau thi\u1ebft k\u1ebf ch\u00ednh c\u1ee7a n\u00f3 l\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u cao trong khi duy tr\u00ec <strong>t\u1ef7 s\u1ed1 c\u00f4ng su\u1ea5t \u0111\u1ec9nh tr\u00ean trung b\u00ecnh (PAPR) th\u1ea5p<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u01b0ng t\u1ea1i sao PAPR th\u1ea5p l\u1ea1i quan tr\u1ecdng \u0111\u1ebfn v\u1eady? M\u1ed9t PAPR th\u1ea5p cho ph\u00e9p b\u1ed9 khu\u1ebfch \u0111\u1ea1i c\u00f4ng su\u1ea5t trong c\u00e1c thi\u1ebft b\u1ecb ng\u01b0\u1eddi d\u00f9ng (nh\u01b0 \u0111i\u1ec7n tho\u1ea1i th\u00f4ng minh ho\u1eb7c c\u1ea3m bi\u1ebfn IoT c\u1ee7a b\u1ea1n) ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 h\u01a1n. \u0110i\u1ec1u n\u00e0y tr\u1ef1c ti\u1ebfp d\u1eabn \u0111\u1ebfn:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Th\u1eddi l\u01b0\u1ee3ng pin d\u00e0i h\u01a1n<\/strong><\/p><\/li><li><p style=\"margin: 0px;\">Gi\u1ea3m sinh nhi\u1ec7t<\/p><\/li><li><p style=\"margin: 0px;\">Thi\u1ebft k\u1ebf b\u1ed9 khu\u1ebfch \u0111\u1ea1i c\u00f4ng su\u1ea5t r\u1ebb h\u01a1n v\u00e0 nh\u1ecf g\u1ecdn h\u01a1n<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00f3i ng\u1eafn g\u1ecdn, SC-FDMA ch\u00ednh l\u00e0 l\u00fd do \u0111i\u1ec7n tho\u1ea1i c\u1ee7a b\u1ea1n kh\u00f4ng b\u1ecb qu\u00e1 n\u00f3ng v\u00e0 c\u1ea1n pin ngay l\u1eadp t\u1ee9c khi b\u1ea1n \u0111ang ph\u00e1t tr\u1ef1c ti\u1ebfp ho\u1eb7c g\u1ecdi video.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udcc4 SC-FDMA so v\u1edbi OFDMA: So s\u00e1nh then ch\u1ed1t<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1312\" height=\"690\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ea9748ba23634a0ab3889ba76b1d3059.webp\" alt=\"SC-FDMA\" class=\"wp-image-4435\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ea9748ba23634a0ab3889ba76b1d3059.webp 1312w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ea9748ba23634a0ab3889ba76b1d3059-300x158.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ea9748ba23634a0ab3889ba76b1d3059-1024x539.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ea9748ba23634a0ab3889ba76b1d3059-768x404.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ea9748ba23634a0ab3889ba76b1d3059-18x9.webp 18w\" sizes=\"(max-width: 1312px) 100vw, 1312px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Both <strong>SC-FDMA<\/strong> and <strong>Truy c\u1eadp \u0111a \u0111i\u1ec3m ph\u00e2n chia t\u1ea7n s\u1ed1 tr\u1ef1c giao <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-ofdma-role-modern-connectivity-wifi-5g-networks\/\"><strong>(OFDMA)<br><\/strong><\/a> l\u00e0 hai n\u1ec1n t\u1ea3ng then ch\u1ed1t c\u1ee7a 4G v\u00e0 5G. Tuy nhi\u00ean, ch\u00fang ph\u1ee5c v\u1ee5 nh\u1eefng m\u1ee5c \u0111\u00edch kh\u00e1c nhau do \u0111\u1eb7c t\u00ednh ri\u00eang bi\u1ec7t. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y tr\u00ecnh b\u00e0y chi ti\u1ebft nh\u1eefng kh\u00e1c bi\u1ec7t ch\u00ednh gi\u1eefa ch\u00fang:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>\u0110\u1eb7c t\u00ednh<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>SC-FDMA (\u0111\u01b0\u1eddng l\u00ean)<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>OFDMA (\u0111\u01b0\u1eddng xu\u1ed1ng)<\/strong><\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>M\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng ch\u00ednh<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Thi\u1ebft b\u1ecb ng\u01b0\u1eddi d\u00f9ng (UE) t\u1edbi tr\u1ea1m g\u1ed1c<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Tr\u1ea1m g\u1ed1c t\u1edbi thi\u1ebft b\u1ecb ng\u01b0\u1eddi d\u00f9ng (UE)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>PAPR<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><strong>Th\u1ea5p<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Cao<br><\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Hi\u1ec7u su\u1ea5t b\u1ed9 khu\u1ebfch \u0111\u1ea1i c\u00f4ng su\u1ea5t<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Cao<br><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Lower<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>\u01afu \u0111i\u1ec3m c\u1ed1t l\u00f5i<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Th\u1eddi l\u01b0\u1ee3ng pin t\u1ed1t h\u01a1n cho thi\u1ebft b\u1ecb di \u0111\u1ed9ng<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Hi\u1ec7u su\u1ea5t ph\u1ed5 cao, kh\u1ea3 n\u0103ng ch\u1ed1ng suy pha \u0111a \u0111\u01b0\u1eddng t\u1ed1t<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>\u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u0110\u1ed9 ph\u1ee9c t\u1ea1p cao h\u01a1n t\u1ea1i tr\u1ea1m g\u1ed1c<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u0110\u1ed9 ph\u1ee9c t\u1ea1p cao h\u01a1n t\u1ea1i thi\u1ebft b\u1ecb ng\u01b0\u1eddi d\u00f9ng<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><span class=\"qc-p1-tag\" style=\"color: rgb(15, 17, 21);\">Nh\u01b0 \u0111\u01b0\u1ee3c minh h\u1ecda, l\u1ef1a ch\u1ecdn n\u00e0y l\u00e0 m\u1ed9t s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i. C\u00e1c tr\u1ea1m g\u1ed1c m\u1ea1ng c\u00f3 b\u1ed9 khu\u1ebfch \u0111\u1ea1i m\u1ea1nh, \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n t\u1eeb ngu\u1ed3n l\u01b0\u1edbi, c\u00f3 th\u1ec3 x\u1eed l\u00fd PAPR cao c\u1ee7a OFDMA. Tuy nhi\u00ean, thi\u1ebft b\u1ecb di \u0111\u1ed9ng c\u1ee7a ch\u00fang ta l\u1ea1i h\u01b0\u1edfng l\u1ee3i r\u1ea5t l\u1edbn t\u1eeb hi\u1ec7u qu\u1ea3 c\u1ee7a SC-FDMA.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udcc4 SC-FDMA Ho\u1ea1t \u0110\u1ed9ng Nh\u01b0 Th\u1ebf N\u00e0o? M\u1ed9t C\u00e1i Nh\u00ecn \u0110\u01a1n Gi\u1ea3n<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>SC-FDMA<\/strong> kh\u00e9o l\u00e9o k\u1ebft h\u1ee3p nh\u1eefng \u0111i\u1ec3m m\u1ea1nh c\u1ee7a truy\u1ec1n d\u1eabn \u0111\u01a1n s\u00f3ng mang v\u00e0 c\u00e2n b\u1eb1ng mi\u1ec1n t\u1ea7n s\u1ed1. Qu\u00e1 tr\u00ecnh n\u00e0y bao g\u1ed3m m\u1ed9t s\u1ed1 b\u01b0\u1edbc then ch\u1ed1t:<\/p>\n\n\n\n<ol class=\"wp-block-list\" >\n<li><p style=\"margin: 0px;\"><strong>Chuy\u1ec3n \u0111\u1ed5i n\u1ed1i ti\u1ebfp sang song song:<\/strong> D\u00f2ng d\u1eef li\u1ec7u \u0111\u1ea7u ra \u0111\u01b0\u1ee3c chia nh\u1ecf th\u00e0nh c\u00e1c kh\u1ed1i song song nh\u1ecf h\u01a1n.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Lan t\u1ecfa DFT:<\/strong> \u0110\u00e2y ch\u00ednh l\u00e0 \u201cm\u00e0n \u1ea3o thu\u1eadt\u201d c\u1ee7a SC-FDMA. C\u00e1c kh\u1ed1i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd th\u00f4ng qua Bi\u1ebfn \u0111\u1ed5i Fourier r\u1eddi r\u1ea1c (DFT). Vi\u1ec7c n\u00e0y lan t\u1ecfa t\u00edn hi\u1ec7u \u0111\u01a1n s\u00f3ng mang tr\u00ean nhi\u1ec1u s\u00f3ng con nh\u01b0ng v\u1eabn gi\u1eef nguy\u00ean b\u1ea3n ch\u1ea5t \u0111\u01a1n s\u00f3ng mang, t\u1eeb \u0111\u00f3 t\u1ea1o ra PAPR th\u1ea5p h\u01a1n.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>\u00c1nh x\u1ea1 s\u00f3ng con:<\/strong> C\u00e1c k\u00fd hi\u1ec7u \u0111\u00e3 bi\u1ebfn \u0111\u1ed5i sau \u0111\u00f3 \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 v\u00e0o c\u00e1c s\u00f3ng con tr\u1ef1c giao c\u1ee5 th\u1ec3.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Ph\u00e9p to\u00e1n IFFT:<\/strong> Bi\u1ebfn \u0111\u1ed5i Fourier nhanh ngh\u1ecbch \u0111\u1ea3o (IFFT) chuy\u1ec3n t\u00edn hi\u1ec7u t\u1eeb mi\u1ec1n t\u1ea7n s\u1ed1 tr\u1edf l\u1ea1i mi\u1ec1n th\u1eddi gian \u0111\u1ec3 truy\u1ec1n \u0111i.<\/p><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00edn hi\u1ec7u v\u1eabn b\u1ec1n b\u1ec9 v\u00e0 hi\u1ec7u qu\u1ea3 trong su\u1ed1t h\u00e0nh tr\u00ecnh \u0111\u1ebfn tr\u1ea1m g\u1ed1c.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udcc4 C\u1ea7u N\u1ed1i Tr\u1ecdng Y\u1ebfu: SC-FDMA v\u00e0 C\u00e1c M\u00f4-\u0111un Quang (Fronthaul)<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 n\u01a1i th\u1ebf gi\u1edbi k\u1ef9 thu\u1eadt s\u1ed1 g\u1eb7p g\u1ee1 th\u1ebf gi\u1edbi v\u1eadt l\u00fd. D\u1eef li\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c b\u1edfi tr\u1ea1m ph\u00e1t s\u00f3ng th\u00f4ng qua <strong>SC-FDMA<\/strong> kh\u00f4ng ch\u1ec9 d\u1eebng l\u1ea1i \u1edf \u0111\u00f3; m\u00e0 ngay l\u1eadp t\u1ee9c \u0111\u01b0\u1ee3c t\u1eadp h\u1ee3p v\u00e0 g\u1eedi t\u1edbi m\u1ea1ng l\u00f5i th\u00f4ng qua m\u1ed9t <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/5g-fronthaul-high-speed-low-latency-communication-explained\/\"><strong>m\u1ea1ng fronthaul<\/strong><\/a>. M\u1ea1ng n\u00e0y l\u00e0 x\u01b0\u01a1ng s\u1ed1ng c\u00e1p quang t\u1ed1c \u0111\u1ed9 cao, k\u1ebft n\u1ed1i h\u00e0ng ngh\u00ecn tr\u1ea1m thu ph\u00e1t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 l\u0129nh v\u1ef1c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\"><strong>module quang<br><\/strong><\/a>. Nh\u1eefng thi\u1ebft b\u1ecb nh\u1ecf b\u00e9 nh\u01b0ng m\u1ea1nh m\u1ebd n\u00e0y chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u \u0111i\u1ec7n t\u1eeb thi\u1ebft b\u1ecb v\u00f4 tuy\u1ebfn th\u00e0nh c\u00e1c xung \u00e1nh s\u00e1ng \u0111\u1ec3 truy\u1ec1n \u0111i tr\u00ean c\u00e1p quang. Hi\u1ec7u qu\u1ea3 c\u1ee7a \u0111\u01b0\u1eddng l\u00ean, kh\u1edfi x\u01b0\u1edbng b\u1edfi SC-FDMA, ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u00e1p \u1ee9ng t\u01b0\u01a1ng x\u1ee9ng b\u1edfi dung l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a k\u1ebft n\u1ed1i fronthaul.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng l\u00ean 5G \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u su\u1ea5t cao d\u1ef1a tr\u00ean SC-FDMA, c\u00e1c nh\u00e0 khai th\u00e1c m\u1ea1ng c\u1ea7n <strong>c\u00e1c b\u1ed9 thu ph\u00e1t quang c\u00f3 \u0111\u1ed9 tr\u1ec5 th\u1ea5p v\u00e0 b\u0103ng th\u00f4ng cao<\/strong>. \u0110\u00e2y l\u00e0 l\u00fac vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u1ea7n c\u1ee9ng ph\u00f9 h\u1ee3p tr\u1edf n\u00ean c\u1ef1c k\u1ef3 quan tr\u1ecdng. V\u00ed d\u1ee5, m\u1ed9t s\u1ea3n ph\u1ea9m \u0111\u00e1ng tin c\u1eady nh\u01b0 <strong>LINK-PP <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/472118.htm\"><strong>QSFP28 100G-LR4<\/strong><\/a> m\u00f4-\u0111un quang \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 x\u1eed l\u00fd lu\u1ed3ng d\u1eef li\u1ec7u kh\u1ed5ng l\u1ed3 t\u1eeb c\u00e1c tr\u1ea1m g\u1ed1c \u0111\u1ebfn l\u00f5i, \u0111\u1ea3m b\u1ea3o r\u1eb1ng hi\u1ec7u qu\u1ea3 \u0111\u1ea1t \u0111\u01b0\u1ee3c nh\u1edd SC-FDMA s\u1ebd kh\u00f4ng b\u1ecb m\u1ea5t \u0111i trong m\u1ea1ng truy\u1ec1n t\u1ea3i. Khi l\u1eadp k\u1ebf ho\u1ea1ch cho <strong>ki\u1ebfn tr\u00fac fronthaul 5G<\/strong>, vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111\u00fang <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-27045-100g-qsfp28-sfp-dd.htm\"><strong>b\u1ed9 thu ph\u00e1t quang t\u1ed1c \u0111\u1ed9 cao<\/strong><\/a> l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh then ch\u1ed1t, \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u n\u0103ng t\u1ed5ng th\u1ec3 c\u1ee7a m\u1ea1ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udcc4 V\u00ec sao SC-FDMA v\u1eabn c\u00f2n quan tr\u1ecdng \u0111\u1ed1i v\u1edbi 5G v\u00e0 c\u00e1c th\u1ebf h\u1ec7 sau<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ngay c\u1ea3 khi 5G ra \u0111\u1eddi, SC-FDMA v\u1eabn gi\u1eef vai tr\u00f2 quan tr\u1ecdng. Radio m\u1edbi 5G (NR) ban \u0111\u1ea7u \u00e1p d\u1ee5ng OFDMA cho c\u1ea3 k\u00eanh l\u00ean v\u00e0 k\u00eanh xu\u1ed1ng nh\u1eb1m \u0111\u01a1n gi\u1ea3n h\u00f3a thi\u1ebft k\u1ebf, nh\u01b0ng \u0111\u00e3 gi\u1edbi thi\u1ec7u c\u00e1c k\u1ef9 thu\u1eadt nh\u01b0 <strong>DFT-s-OFDM (OFDM tr\u1ea3i r\u1ed9ng b\u1eb1ng Bi\u1ebfn \u0111\u1ed5i Fourier r\u1eddi r\u1ea1c)<\/strong>. \u0110\u00e2y v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 SC-FDMA d\u01b0\u1edbi m\u1ed9t t\u00ean g\u1ecdi m\u1edbi, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong 5G nh\u1eb1m truy\u1ec1n d\u1eabn k\u00eanh l\u00ean ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng, \u0111\u1eb7c bi\u1ec7t trong c\u00e1c t\u00ecnh hu\u1ed1ng b\u1ecb gi\u1edbi h\u1ea1n v\u1ec1 v\u00f9ng ph\u1ee7.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u n\u00e0y ch\u1ee9ng minh r\u1eb1ng nh\u1eefng l\u1ee3i \u00edch c\u1ed1t l\u00f5i c\u1ee7a SC-FDMA\u2014t\u1ee9c l\u00e0 t\u1ef7 s\u1ed1 \u0111\u1ec9nh-trung b\u00ecnh (PAPR) th\u1ea5p cho thi\u1ebft b\u1ecb ng\u01b0\u1eddi d\u00f9ng\u2014l\u00e0 b\u1ea5t bi\u1ebfn theo th\u1eddi gian, kh\u1eb3ng \u0111\u1ecbnh vai tr\u00f2 kh\u00f4ng th\u1ec3 thay th\u1ebf c\u1ee7a SC-FDMA trong c\u00e1c th\u1ebf h\u1ec7 v\u00f4 tuy\u1ebfn hi\u1ec7n t\u1ea1i v\u00e0 t\u01b0\u01a1ng lai.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udcc4 K\u1ebft lu\u1eadn: \u0110\u1ed9ng c\u01a1 hi\u1ec7u qu\u1ea3 c\u1ee7a k\u1ebft n\u1ed1i<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>SC-FDMA<\/strong> c\u00f3 th\u1ec3 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t c\u00e1i t\u00ean quen thu\u1ed9c trong m\u1ecdi gia \u0111\u00ecnh, nh\u01b0ng n\u00f3 l\u00e0 m\u1ed9t tr\u1ee5 c\u1ed9t c\u1ee7a kh\u1ea3 n\u0103ng k\u1ebft n\u1ed1i di \u0111\u1ed9ng hi\u1ec7n \u0111\u1ea1i. B\u1eb1ng c\u00e1ch cho ph\u00e9p truy\u1ec1n t\u1ea3i l\u00ean (uplink) hi\u1ec7u qu\u1ea3 v\u1ec1 m\u1eb7t n\u0103ng l\u01b0\u1ee3ng, n\u00f3 tr\u1ef1c ti\u1ebfp g\u00f3p ph\u1ea7n v\u00e0o c\u00e1c thi\u1ebft b\u1ecb v\u00e0 tr\u1ea3i nghi\u1ec7m m\u00e0 ch\u00fang ta ph\u1ee5 thu\u1ed9c h\u00e0ng ng\u00e0y. T\u1eeb vi\u1ec7c h\u1ed7 tr\u1ee3 c\u00e1c cu\u1ed9c g\u1ecdi tho\u1ea1i r\u00f5 n\u00e9t \u0111\u1ebfn vi\u1ec7c t\u1ea3i l\u00ean video \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao m\u01b0\u1ee3t m\u00e0, SC-FDMA ch\u00ednh l\u00e0 \u0111\u1ed9ng c\u01a1 hi\u1ec7u qu\u1ea3 ho\u1ea1t \u0111\u1ed9ng ph\u00eda sau h\u1eadu tr\u01b0\u1eddng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>S\u1eb5n s\u00e0ng x\u00e2y d\u1ef1ng c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng m\u1ea1ng hi\u1ec7u qu\u1ea3 v\u00e0 m\u1ea1nh m\u1ebd h\u01a1n?<\/strong> S\u1ef1 k\u1ebft h\u1ee3p h\u00e0i h\u00f2a gi\u1eefa c\u00e1c c\u00f4ng ngh\u1ec7 v\u00f4 tuy\u1ebfn ti\u00ean ti\u1ebfn nh\u01b0 SC-FDMA v\u00e0 ph\u1ea7n c\u1ee9ng b\u1ec1n b\u1ec9 l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t. H\u00e3y kh\u00e1m ph\u00e1 c\u00e1ch c\u00e1c th\u00e0nh ph\u1ea7n hi\u1ec7u su\u1ea5t cao c\u00f3 th\u1ec3 gi\u00fap tri\u1ec3n khai c\u1ee7a b\u1ea1n s\u1eb5n s\u00e0ng cho t\u01b0\u01a1ng lai.<\/p>\n\n\n\n<div><div widgetid=\"3ef779ac451211f099380a58fbc66727\" format=\"embedded\" data-widget-id=\"3ef779ac451211f099380a58fbc66727\" data-mode=\"production.zh\" style=\"display: block;\"><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udcc4 C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQ)<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" >SC-FDMA l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a g\u00ec?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SC-FDMA l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a \u0110a truy nh\u1eadp ph\u00e2n chia t\u1ea7n s\u1ed1 mang \u0111\u01a1n (Single Carrier Frequency Division Multiple Access). B\u1ea1n s\u1ebd b\u1eaft g\u1eb7p thu\u1eadt ng\u1eef n\u00e0y khi t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1ch \u0111i\u1ec7n tho\u1ea1i c\u1ee7a b\u1ea1n g\u1eedi d\u1eef li\u1ec7u t\u1edbi m\u1ea1ng, \u0111\u1eb7c bi\u1ec7t trong \u0111\u01b0\u1eddng l\u00ean (uplink) c\u1ee7a 5G v\u00e0 LTE.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >\u0110i\u1ec1u g\u00ec l\u00e0m cho SC-FDMA kh\u00e1c bi\u1ec7t so v\u1edbi OFDM?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SC-FDMA s\u1eed d\u1ee5ng c\u1ea5u tr\u00fac mang \u0111\u01a1n. \u0110i\u1ec1u n\u00e0y gi\u00fap thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n ti\u00eau th\u1ee5 \u00edt n\u0103ng l\u01b0\u1ee3ng h\u01a1n. OFDM s\u1eed d\u1ee5ng nhi\u1ec1u mang c\u00f9ng l\u00fac. V\u1edbi SC-FDMA, b\u1ea1n \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ef7 s\u1ed1 c\u00f4ng su\u1ea5t \u0111\u1ec9nh tr\u00ean trung b\u00ecnh (PAPR) th\u1ea5p h\u01a1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >B\u1ea1n \u0111\u01b0\u1ee3c h\u01b0\u1edfng nh\u1eefng l\u1ee3i \u00edch n\u00e0o t\u1eeb SC-FDMA trong \u0111\u01b0\u1eddng l\u00ean (uplink) c\u1ee7a LTE?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n s\u1ebd c\u00f3 th\u1eddi l\u01b0\u1ee3ng pin d\u00e0i h\u01a1n, t\u1ed1c \u0111\u1ed9 t\u1ea3i l\u00ean nhanh h\u01a1n v\u00e0 k\u1ebft n\u1ed1i \u1ed5n \u0111\u1ecbnh h\u01a1n. SC-FDMA gi\u00fap \u0111i\u1ec7n tho\u1ea1i c\u1ee7a b\u1ea1n g\u1eedi d\u1eef li\u1ec7u m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. M\u1ea1ng c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng h\u01a1n c\u00f9ng m\u1ed9t l\u00fac.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Nh\u1eefng thi\u1ebft b\u1ecb n\u00e0o s\u1eed d\u1ee5ng SC-FDMA?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">H\u1ea7u h\u1ebft \u0111i\u1ec7n tho\u1ea1i th\u00f4ng minh v\u00e0 m\u00e1y t\u00ednh b\u1ea3ng h\u1ed7 tr\u1ee3 LTE \u0111\u1ec1u s\u1eed d\u1ee5ng SC-FDMA cho \u0111\u01b0\u1eddng l\u00ean (uplink). M\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb 5G c\u0169ng s\u1eed d\u1ee5ng n\u00f3 khi g\u1eedi d\u1eef li\u1ec7u t\u1edbi m\u1ea1ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >\u0110i\u1ec1u g\u00ec x\u1ea3y ra n\u1ebfu \u0111i\u1ec7n tho\u1ea1i c\u1ee7a b\u1ea1n kh\u00f4ng s\u1eed d\u1ee5ng SC-FDMA?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec7n tho\u1ea1i c\u1ee7a b\u1ea1n s\u1ebd ti\u00eau t\u1ed1n nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng h\u01a1n \u0111\u1ec3 g\u1eedi d\u1eef li\u1ec7u. B\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y th\u1eddi l\u01b0\u1ee3ng pin ng\u1eafn h\u01a1n v\u00e0 t\u1ed1c \u0111\u1ed9 t\u1ea3i l\u00ean ch\u1eadm h\u01a1n. T\u00edn hi\u1ec7u c\u00f3 th\u1ec3 tr\u1edf n\u00ean k\u00e9m \u1ed5n \u0111\u1ecbnh h\u01a1n, \u0111\u1eb7c bi\u1ec7t khi nhi\u1ec1u ng\u01b0\u1eddi c\u00f9ng s\u1eed d\u1ee5ng m\u1ea1ng.<\/p>\n\n\n\n<script src=\"https:\/\/cdn.mylandingpages.co\/widgets\/platform\/platform.widget.js\" async=\"true\"><\/script>","protected":false},"excerpt":{"rendered":"<p>SC-FDMA l\u00e0 g\u00ec? SC-FDMA gi\u00fap li\u00ean k\u1ebft l\u00ean (uplink) c\u1ee7a LTE ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 h\u01a1n b\u1eb1ng c\u00e1ch gi\u1ea3m m\u1ee9c ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng, k\u00e9o d\u00e0i th\u1eddi l\u01b0\u1ee3ng pin v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00edn hi\u1ec7u di \u0111\u1ed9ng m\u1ea1nh m\u1ebd.<\/p>","protected":false},"author":1,"featured_media":4434,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[27],"tags":[26],"class_list":["post-4436","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","tag-optics-transceivers"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4436","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/comments?post=4436"}],"version-history":[{"count":5,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4436\/revisions"}],"predecessor-version":[{"id":11088,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4436\/revisions\/11088"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media\/4434"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media?parent=4436"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/categories?post=4436"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/tags?post=4436"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}