{"id":478421,"date":"2023-08-09T09:32:37","date_gmt":"2023-08-09T09:32:37","guid":{"rendered":""},"modified":"2023-09-05T11:16:45","modified_gmt":"2023-09-05T11:16:45","slug":"phase-shift-keying","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/phase-shift-keying\/","title":{"rendered":"Giai \u0111o\u1ea1n chuy\u1ec3n \u0111\u1ed5i keying"},"content":{"rendered":"<p>Kh\u00f3a d\u1ecbch pha (PSK) l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt \u0111i\u1ec1u ch\u1ebf k\u1ef9 thu\u1eadt s\u1ed1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng d\u1eef li\u1ec7u v\u00e0 vi\u1ec5n th\u00f4ng \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt s\u1ed1 qua c\u00e1c k\u00eanh truy\u1ec1n th\u00f4ng t\u01b0\u01a1ng t\u1ef1. \u0110\u00e2y l\u00e0 m\u1ed9t d\u1ea1ng kh\u00f3a d\u1ecbch chuy\u1ec3n bi\u00ean \u0111\u1ed9 (ASK) trong \u0111\u00f3 pha c\u1ee7a t\u00edn hi\u1ec7u s\u00f3ng mang \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ebf \u0111\u1ec3 th\u1ec3 hi\u1ec7n th\u00f4ng tin s\u1ed1.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a kh\u00f3a d\u1ecbch pha v\u00e0 s\u1ef1 \u0111\u1ec1 c\u1eadp \u0111\u1ea7u ti\u00ean c\u1ee7a n\u00f3<\/h2>\n<p>Kh\u00f3a d\u1ecbch pha c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb nh\u1eefng ng\u00e0y \u0111\u1ea7u c\u1ee7a \u0111i\u1ec7n b\u00e1o kh\u00f4ng d\u00e2y khi c\u00e1c nh\u00e0 khai th\u00e1c \u0111i\u1ec7n b\u00e1o s\u1eed d\u1ee5ng m\u00e3 Morse \u0111\u1ec3 li\u00ean l\u1ea1c qua kho\u1ea3ng c\u00e1ch xa. Kh\u00e1i ni\u1ec7m s\u1eed d\u1ee5ng c\u00e1c pha kh\u00e1c nhau c\u1ee7a t\u00edn hi\u1ec7u s\u00f3ng mang \u0111\u1ec3 th\u1ec3 hi\u1ec7n th\u00f4ng tin l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp b\u1edfi Ralph Hartley trong b\u00e0i b\u00e1o n\u0103m 1928 c\u1ee7a \u00f4ng c\u00f3 t\u1ef1a \u0111\u1ec1 \u201cTruy\u1ec1n th\u00f4ng tin\u201d. \u00d4ng \u0111\u00e3 th\u1ea3o lu\u1eadn v\u1ec1 \u00fd t\u01b0\u1edfng \u0111i\u1ec1u ch\u1ebf pha nh\u01b0 m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n d\u1eef li\u1ec7u hi\u1ec7u qu\u1ea3 qua c\u00e1c k\u00eanh truy\u1ec1n th\u00f4ng.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 kh\u00f3a d\u1ecbch pha<\/h2>\n<p>Kh\u00f3a d\u1ecbch pha l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt \u0111i\u1ec1u ch\u1ebf m\u00e3 h\u00f3a d\u1eef li\u1ec7u s\u1ed1 tr\u00ean s\u00f3ng mang t\u01b0\u01a1ng t\u1ef1 b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i pha c\u1ee7a t\u00edn hi\u1ec7u s\u00f3ng mang. D\u1eef li\u1ec7u s\u1ed1, th\u01b0\u1eddng \u1edf d\u1ea1ng bit, \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 t\u1edbi c\u00e1c g\u00f3c pha c\u1ee5 th\u1ec3 c\u1ee7a t\u00edn hi\u1ec7u s\u00f3ng mang. S\u1ef1 chuy\u1ec3n pha gi\u1eefa c\u00e1c g\u00f3c n\u00e0y th\u1ec3 hi\u1ec7n th\u00f4ng tin nh\u1ecb ph\u00e2n \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i.<\/p>\n<p>Trong PSK, bi\u00ean \u0111\u1ed9 t\u00edn hi\u1ec7u s\u00f3ng mang kh\u00f4ng \u0111\u1ed5i, trong khi pha thay \u0111\u1ed5i theo d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ebf. C\u00e1c s\u01a1 \u0111\u1ed3 PSK ph\u1ed5 bi\u1ebfn nh\u1ea5t bao g\u1ed3m Kh\u00f3a d\u1ecbch pha nh\u1ecb ph\u00e2n (BPSK), Kh\u00f3a d\u1ecbch pha c\u1ea7u ph\u01b0\u01a1ng (QPSK) v\u00e0 Kh\u00f3a d\u1ecbch pha v\u1edbi k\u00fd hi\u1ec7u M-ary (M-PSK).<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a kh\u00f3a d\u1ecbch pha v\u00e0 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng<\/h2>\n<p>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a b\u1ed9 \u0111i\u1ec1u ch\u1ebf PSK bao g\u1ed3m ngu\u1ed3n d\u1eef li\u1ec7u s\u1ed1, b\u1ed9 t\u1ea1o t\u00edn hi\u1ec7u s\u00f3ng mang v\u00e0 b\u1ed9 \u0111i\u1ec1u ch\u1ebf pha. Qu\u00e1 tr\u00ecnh \u0111i\u1ec1u ch\u1ebf PSK bao g\u1ed3m c\u00e1c b\u01b0\u1edbc sau:<\/p>\n<ol>\n<li>\n<p><strong>Ngu\u1ed3n d\u1eef li\u1ec7u s\u1ed1<\/strong>: D\u1eef li\u1ec7u nh\u1ecb ph\u00e2n c\u1ea7n truy\u1ec1n \u0111\u01b0\u1ee3c t\u1ea1o t\u1eeb ngu\u1ed3n d\u1eef li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u00e1y t\u00ednh ho\u1eb7c b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb k\u1ef9 thu\u1eadt s\u1ed1 n\u00e0o.<\/p>\n<\/li>\n<li>\n<p><strong>T\u1ea1o t\u00edn hi\u1ec7u s\u00f3ng mang<\/strong>: T\u00edn hi\u1ec7u s\u00f3ng mang \u1ed5n \u0111\u1ecbnh \u0111\u01b0\u1ee3c t\u1ea1o ra, th\u01b0\u1eddng s\u1eed d\u1ee5ng m\u1ea1ch dao \u0111\u1ed9ng. T\u1ea7n s\u1ed1 c\u1ee7a t\u00edn hi\u1ec7u s\u00f3ng mang n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o y\u00eau c\u1ea7u c\u1ee7a h\u1ec7 th\u1ed1ng th\u00f4ng tin li\u00ean l\u1ea1c.<\/p>\n<\/li>\n<li>\n<p><strong>B\u1ed9 \u0111i\u1ec1u bi\u1ebfn pha<\/strong>: D\u1eef li\u1ec7u s\u1ed1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n b\u1ed9 \u0111i\u1ec1u bi\u1ebfn pha, l\u00e0m thay \u0111\u1ed5i pha c\u1ee7a t\u00edn hi\u1ec7u s\u00f3ng mang d\u1ef1a tr\u00ean c\u00e1c gi\u00e1 tr\u1ecb nh\u1ecb ph\u00e2n c\u1ee7a d\u1eef li\u1ec7u. V\u00ed d\u1ee5: trong BPSK, bit \u201c0\u201d c\u00f3 th\u1ec3 t\u01b0\u01a1ng \u1ee9ng v\u1edbi \u0111\u1ed9 l\u1ec7ch pha 0 \u0111\u1ed9 v\u00e0 bit \u201c1\u201d c\u00f3 th\u1ec3 t\u01b0\u01a1ng \u1ee9ng v\u1edbi \u0111\u1ed9 l\u1ec7ch pha 180 \u0111\u1ed9.<\/p>\n<\/li>\n<li>\n<p><strong>Qu\u00e1 tr\u00ecnh l\u00e2y truy\u1ec1n<\/strong>: T\u00edn hi\u1ec7u s\u00f3ng mang \u0111\u00e3 \u0111i\u1ec1u ch\u1ebf sau \u0111\u00f3 \u0111\u01b0\u1ee3c g\u1eedi qua k\u00eanh li\u00ean l\u1ea1c, n\u01a1i n\u00f3 truy\u1ec1n \u0111\u1ebfn m\u00e1y thu.<\/p>\n<\/li>\n<\/ol>\n<p>\u1ede \u0111\u1ea7u thu, b\u1ed9 gi\u1ea3i \u0111i\u1ec1u ch\u1ebf ph\u1ee5c h\u1ed3i d\u1eef li\u1ec7u g\u1ed1c b\u1eb1ng c\u00e1ch ph\u00e2n t\u00edch s\u1ef1 chuy\u1ec3n pha trong t\u00edn hi\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c.<\/p>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a kh\u00f3a d\u1ecbch pha<\/h2>\n<p>Kh\u00f3a d\u1ecbch pha mang l\u1ea1i m\u1ed9t s\u1ed1 \u01b0u \u0111i\u1ec3m, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh k\u1ef9 thu\u1eadt \u0111i\u1ec1u ch\u1ebf ph\u1ed5 bi\u1ebfn trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng kh\u00e1c nhau:<\/p>\n<ol>\n<li>\n<p><strong>Hi\u1ec7u qu\u1ea3 b\u0103ng th\u00f4ng<\/strong>: PSK ti\u1ebft ki\u1ec7m b\u0103ng th\u00f4ng h\u01a1n c\u00e1c k\u1ef9 thu\u1eadt \u0111i\u1ec1u ch\u1ebf bi\u00ean \u0111\u1ed9 v\u00ec n\u00f3 s\u1eed d\u1ee5ng c\u00e1c bi\u1ebfn \u0111\u1ed5i pha \u0111\u1ec3 bi\u1ec3u di\u1ec5n d\u1eef li\u1ec7u thay v\u00ec thay \u0111\u1ed5i bi\u00ean \u0111\u1ed9.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ed9 b\u1ec1n v\u1edbi ti\u1ebfng \u1ed3n<\/strong>: PSK c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng nhi\u1ec5u v\u00e0 nhi\u1ec5u t\u01b0\u01a1ng \u0111\u1ed1i t\u1ed1t, \u0111\u1eb7c bi\u1ec7t khi so s\u00e1nh v\u1edbi c\u00e1c s\u01a1 \u0111\u1ed3 \u0111i\u1ec1u ch\u1ebf bi\u00ean \u0111\u1ed9. S\u1ef1 m\u1ea1nh m\u1ebd n\u00e0y l\u00e0m cho n\u00f3 ph\u00f9 h\u1ee3p \u0111\u1ec3 li\u00ean l\u1ea1c qua c\u00e1c k\u00eanh \u1ed3n \u00e0o.<\/p>\n<\/li>\n<li>\n<p><strong>Hi\u1ec7u qu\u1ea3 quang ph\u1ed5<\/strong>: V\u1edbi c\u00e1c s\u01a1 \u0111\u1ed3 PSK b\u1eadc cao h\u01a1n nh\u01b0 QPSK ho\u1eb7c 8-PSK, nhi\u1ec1u bit c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy\u1ec1n tr\u00ean m\u1ed7i k\u00fd hi\u1ec7u, t\u0103ng t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u1ea7n t\u0103ng b\u0103ng th\u00f4ng.<\/p>\n<\/li>\n<li>\n<p><strong>Gi\u1ea3i \u0111i\u1ec1u ch\u1ebf \u0111\u01a1n gi\u1ea3n<\/strong>: Qu\u00e1 tr\u00ecnh gi\u1ea3i \u0111i\u1ec1u ch\u1ebf trong PSK t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u01a1n gi\u1ea3n, d\u1ec5 th\u1ef1c hi\u1ec7n v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec1u \u1ee9ng d\u1ee5ng kh\u00e1c nhau.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i kh\u00f3a d\u1ecbch pha<\/h2>\n<p>C\u00f3 m\u1ed9t s\u1ed1 lo\u1ea1i kh\u00f3a Chuy\u1ec3n pha, m\u1ed7i lo\u1ea1i mang l\u1ea1i nh\u1eefng \u01b0u \u0111i\u1ec3m v\u00e0 s\u1ef1 c\u00e2n b\u1eb1ng kh\u00e1c nhau. C\u00e1c lo\u1ea1i PSK ph\u1ed5 bi\u1ebfn nh\u1ea5t bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>Kh\u00f3a d\u1ecbch pha nh\u1ecb ph\u00e2n (BPSK)<\/strong>: BPSK s\u1eed d\u1ee5ng hai pha \u0111\u1ec3 bi\u1ec3u di\u1ec5n d\u1eef li\u1ec7u s\u1ed1, th\u01b0\u1eddng l\u00e0 0 v\u00e0 180 \u0111\u1ed9. \u0110\u00e2y l\u00e0 d\u1ea1ng PSK \u0111\u01a1n gi\u1ea3n nh\u1ea5t v\u00e0 t\u01b0\u01a1ng \u0111\u1ed1i m\u1ea1nh m\u1ebd nh\u01b0ng k\u00e9m hi\u1ec7u qu\u1ea3 v\u1ec1 b\u0103ng th\u00f4ng.<\/p>\n<\/li>\n<li>\n<p><strong>Kh\u00f3a d\u1ecbch pha c\u1ea7u ph\u01b0\u01a1ng (QPSK)<\/strong>: QPSK s\u1eed d\u1ee5ng b\u1ed1n pha, th\u01b0\u1eddng c\u00e1ch nhau 90 \u0111\u1ed9, \u0111\u1ec3 bi\u1ec3u di\u1ec5n hai bit d\u1eef li\u1ec7u tr\u00ean m\u1ed7i k\u00fd hi\u1ec7u. N\u00f3 cung c\u1ea5p hi\u1ec7u qu\u1ea3 b\u0103ng th\u00f4ng t\u1ed1t h\u01a1n BPSK.<\/p>\n<\/li>\n<li>\n<p><strong>8-PSK<\/strong>: 8-PSK s\u1eed d\u1ee5ng t\u00e1m giai \u0111o\u1ea1n kh\u00e1c nhau, cho ph\u00e9p n\u00f3 truy\u1ec1n ba bit cho m\u1ed7i k\u00fd hi\u1ec7u. N\u00f3 mang l\u1ea1i hi\u1ec7u su\u1ea5t ph\u1ed5 cao h\u01a1n nh\u01b0ng d\u1ec5 b\u1ecb l\u1ed7i h\u01a1n \u1edf c\u00e1c k\u00eanh nhi\u1ec5u.<\/p>\n<\/li>\n<li>\n<p><strong>16-PSK<\/strong>: 16-PSK s\u1eed d\u1ee5ng 16 pha kh\u00e1c nhau, cho ph\u00e9p n\u00f3 truy\u1ec1n b\u1ed1n bit tr\u00ean m\u1ed7i k\u00fd hi\u1ec7u. Tuy nhi\u00ean, n\u00f3 tr\u1edf n\u00ean d\u1ec5 b\u1ecb nhi\u1ec5u h\u01a1n v\u00e0 y\u00eau c\u1ea7u t\u1ef7 l\u1ec7 t\u00edn hi\u1ec7u tr\u00ean t\u1ea1p \u00e2m cao h\u01a1n.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng kh\u00f3a d\u1ecbch pha, s\u1ef1 c\u1ed1 v\u00e0 gi\u1ea3i ph\u00e1p<\/h2>\n<p>Kh\u00f3a d\u1ecbch pha t\u00ecm th\u1ea5y c\u00e1c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>Truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y<\/strong>: PSK \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c h\u1ec7 th\u1ed1ng li\u00ean l\u1ea1c kh\u00f4ng d\u00e2y, ch\u1eb3ng h\u1ea1n nh\u01b0 Wi-Fi, Bluetooth v\u00e0 li\u00ean l\u1ea1c v\u1ec7 tinh, do hi\u1ec7u qu\u1ea3 quang ph\u1ed5 v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng nhi\u1ec5u t\u1ed1t.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e1t s\u00f3ng k\u1ef9 thu\u1eadt s\u1ed1<\/strong>: \u0110i\u1ec1u ch\u1ebf PSK \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e1t s\u00f3ng k\u1ef9 thu\u1eadt s\u1ed1 \u0111\u1ec3 truy\u1ec1n t\u00edn hi\u1ec7u truy\u1ec1n h\u00ecnh v\u00e0 radio.<\/p>\n<\/li>\n<li>\n<p><strong>L\u01b0u tr\u1eef d\u1eef li\u1ec7u<\/strong>: PSK \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c c\u00f4ng ngh\u1ec7 l\u01b0u tr\u1eef d\u1eef li\u1ec7u, bao g\u1ed3m l\u01b0u tr\u1eef quang h\u1ecdc v\u00e0 ghi t\u1eeb t\u00ednh.<\/p>\n<\/li>\n<\/ol>\n<p>B\u1ea5t ch\u1ea5p nh\u1eefng \u01b0u \u0111i\u1ec3m c\u1ee7a n\u00f3, \u0111i\u1ec1u ch\u1ebf PSK ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi nh\u1eefng th\u00e1ch th\u1ee9c trong m\u00f4i tr\u01b0\u1eddng nhi\u1ec5u cao v\u00e0 \u0111i\u1ec1u ki\u1ec7n pha \u0111inh \u0111a \u0111\u01b0\u1eddng. M\u1ed9t s\u1ed1 gi\u1ea3i ph\u00e1p cho nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y bao g\u1ed3m:<\/p>\n<ul>\n<li>\n<p><strong>M\u00e3 s\u1eeda l\u1ed7i<\/strong>: S\u1eed d\u1ee5ng c\u00e1c m\u00e3 s\u1eeda l\u1ed7i nh\u01b0 Reed-Solomon ho\u1eb7c m\u00e3 ch\u1eadp c\u00f3 th\u1ec3 n\u00e2ng cao kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i l\u1ed7i c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<li>\n<p><strong>K\u1ef9 thu\u1eadt \u0111a d\u1ea1ng<\/strong>: Vi\u1ec7c th\u1ef1c hi\u1ec7n c\u00e1c k\u1ef9 thu\u1eadt ph\u00e2n t\u1eadp, ch\u1eb3ng h\u1ea1n nh\u01b0 ph\u00e2n t\u1eadp kh\u00f4ng gian ho\u1eb7c ph\u00e2n t\u1eadp th\u1eddi gian, c\u00f3 th\u1ec3 gi\u1ea3m thi\u1ec3u t\u00e1c \u0111\u1ed9ng c\u1ee7a pha \u0111inh v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<table>\n<thead>\n<tr>\n<th><strong>\u0110\u1eb7c tr\u01b0ng<\/strong><\/th>\n<th><strong>Kh\u00f3a d\u1ecbch pha (PSK)<\/strong><\/th>\n<th><strong>Kh\u00f3a d\u1ecbch chuy\u1ec3n t\u1ea7n s\u1ed1 (FSK)<\/strong><\/th>\n<th><strong>Kh\u00f3a d\u1ecbch chuy\u1ec3n bi\u00ean \u0111\u1ed9 (ASK)<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n<\/strong><\/td>\n<td>Pha s\u00f3ng mang \u0111i\u1ec1u bi\u1ebfn<\/td>\n<td>\u0110i\u1ec1u ch\u1ebf t\u1ea7n s\u1ed1 s\u00f3ng mang<\/td>\n<td>\u0110i\u1ec1u ch\u1ec9nh bi\u00ean \u0111\u1ed9 s\u00f3ng mang<\/td>\n<\/tr>\n<tr>\n<td><strong>S\u1ef1 mi\u00eau t\u1ea3 d\u1eef li\u1ec7u<\/strong><\/td>\n<td>Chuy\u1ec3n pha th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u<\/td>\n<td>S\u1ef1 thay \u0111\u1ed5i t\u1ea7n s\u1ed1 th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u<\/td>\n<td>Thay \u0111\u1ed5i bi\u00ean \u0111\u1ed9 th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u<\/td>\n<\/tr>\n<tr>\n<td><strong>Hi\u1ec7u qu\u1ea3 b\u0103ng th\u00f4ng<\/strong><\/td>\n<td>Cao<\/td>\n<td>V\u1eeba ph\u1ea3i<\/td>\n<td>Th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ed9 b\u1ec1n v\u1edbi ti\u1ebfng \u1ed3n<\/strong><\/td>\n<td>T\u1ed1t<\/td>\n<td>V\u1eeba ph\u1ea3i<\/td>\n<td>Ngh\u00e8o<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/strong><\/td>\n<td>Th\u1ea5p<\/td>\n<td>Th\u1ea5p \u0111\u1ebfn trung b\u00ecnh<\/td>\n<td>Th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td><strong>V\u00ed d\u1ee5 v\u1ec1 \u1ee9ng d\u1ee5ng<\/strong><\/td>\n<td>Truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y, ph\u00e1t s\u00f3ng k\u1ef9 thu\u1eadt s\u1ed1<\/td>\n<td>H\u1ec7 th\u1ed1ng RFID, c\u1ea3m bi\u1ebfn kh\u00f4ng d\u00e2y<\/td>\n<td>Giao ti\u1ebfp b\u1eb1ng gi\u1ecdng n\u00f3i qua c\u00e1c k\u00eanh v\u00f4 tuy\u1ebfn<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn kh\u00f3a d\u1ecbch pha<\/h2>\n<p>T\u01b0\u01a1ng lai c\u1ee7a kh\u00f3a d\u1ecbch pha n\u1eb1m \u1edf vi\u1ec7c c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a n\u00f3 trong m\u00f4i tr\u01b0\u1eddng c\u00f3 \u0111\u1ed9 nhi\u1ec5u cao v\u00e0 kh\u1eafc ph\u1ee5c c\u00e1c th\u00e1ch th\u1ee9c v\u1ec1 m\u1edd d\u1ea7n \u0111a \u0111\u01b0\u1eddng. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u v\u00e0 k\u1ef9 s\u01b0 kh\u00f4ng ng\u1eebng kh\u00e1m ph\u00e1 c\u00e1c k\u1ef9 thu\u1eadt s\u1eeda l\u1ed7i ti\u00ean ti\u1ebfn, s\u01a1 \u0111\u1ed3 \u0111i\u1ec1u ch\u1ebf th\u00edch \u1ee9ng v\u00e0 h\u1ec7 th\u1ed1ng \u0103ng-ten th\u00f4ng minh \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng li\u00ean l\u1ea1c PSK.<\/p>\n<p>Khi c\u00f4ng ngh\u1ec7 ti\u1ebfn b\u1ed9, c\u00e1c s\u01a1 \u0111\u1ed3 PSK b\u1eadc cao h\u01a1n c\u00f3 th\u1ec3 t\u00ecm th\u1ea5y nhi\u1ec1u \u1ee9ng d\u1ee5ng h\u01a1n trong c\u00e1c k\u1ecbch b\u1ea3n truy\u1ec1n d\u1eef li\u1ec7u t\u1ed1c \u0111\u1ed9 cao, ch\u1eb3ng h\u1ea1n nh\u01b0 64-PSK ho\u1eb7c cao h\u01a1n, gi\u00fap t\u0103ng th\u00eam hi\u1ec7u su\u1ea5t ph\u1ed5 v\u00e0 t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u.<\/p>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi kh\u00f3a chuy\u1ec3n pha<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n d\u1eef li\u1ec7u s\u1eed d\u1ee5ng kh\u00f3a d\u1ecbch pha. H\u1ecd \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7, chuy\u1ec3n ti\u1ebfp c\u00e1c y\u00eau c\u1ea7u v\u00e0 ph\u1ea3n h\u1ed3i d\u1eef li\u1ec7u trong khi v\u1eabn duy tr\u00ec quy\u1ec1n ri\u00eang t\u01b0 v\u00e0 b\u1ea3o m\u1eadt. M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3:<\/p>\n<ol>\n<li>\n<p><strong>T\u0103ng c\u01b0\u1eddng quy\u1ec1n ri\u00eang t\u01b0<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 \u1ea9n \u0111\u1ecba ch\u1ec9 IP c\u1ee7a kh\u00e1ch h\u00e0ng kh\u1ecfi m\u00e1y ch\u1ee7 b\u00ean ngo\u00e0i, cung c\u1ea5p th\u00eam m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt trong qu\u00e1 tr\u00ecnh truy\u1ec1n d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<li>\n<p><strong>C\u1ea3i thi\u1ec7n b\u1ea3o m\u1eadt<\/strong>: Proxy c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 t\u01b0\u1eddng l\u1eeda, l\u1ecdc n\u1ed9i dung \u0111\u1ed9c h\u1ea1i v\u00e0 b\u1ea3o v\u1ec7 m\u1ea1ng n\u1ed9i b\u1ed9 kh\u1ecfi c\u00e1c m\u1ed1i \u0111e d\u1ecda t\u1eeb b\u00ean ngo\u00e0i.<\/p>\n<\/li>\n<li>\n<p><strong>C\u00e2n b\u1eb1ng t\u1ea3i<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 ph\u00e2n ph\u1ed1i l\u01b0u l\u01b0\u1ee3ng gi\u1eefa nhi\u1ec1u m\u00e1y ch\u1ee7, t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<li>\n<p><strong>H\u1ea1n ch\u1ebf l\u00e1ch lu\u1eadt<\/strong>: Trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 v\u01b0\u1ee3t qua c\u00e1c h\u1ea1n ch\u1ebf ho\u1eb7c ki\u1ec3m duy\u1ec7t v\u1ec1 m\u1eb7t \u0111\u1ecba l\u00fd, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp n\u1ed9i dung t\u1eeb c\u00e1c khu v\u1ef1c kh\u00e1c nhau.<\/p>\n<\/li>\n<\/ol>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 kh\u00f3a d\u1ecbch pha, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Phase-shift_keying\" target=\"_new\" rel=\"noopener nofollow\">Wikipedia \u2013 Kh\u00f3a d\u1ecbch pha<\/a><\/li>\n<li><a href=\"https:\/\/www.allaboutcircuits.com\/technical-articles\/phase-shift-keying-psk-modulation-robust-data-transmission-method\/\" target=\"_new\" rel=\"noopener nofollow\">T\u1ea5t c\u1ea3 v\u1ec1 m\u1ea1ch \u0111i\u1ec7n \u2013 Kh\u00f3a d\u1ecbch pha<\/a><\/li>\n<li><a href=\"https:\/\/www.rfwireless-world.com\/Terminology\/Types-of-PSK-modulation.html\" target=\"_new\" rel=\"noopener nofollow\">Th\u1ebf gi\u1edbi kh\u00f4ng d\u00e2y RF \u2013 C\u00e1c lo\u1ea1i PSK<\/a><\/li>\n<\/ol>\n<p>T\u00f3m l\u1ea1i, kh\u00f3a d\u1ecbch pha l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt \u0111i\u1ec1u ch\u1ebf quan tr\u1ecdng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng kh\u00e1c nhau \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u00e1ng tin c\u1eady. Kh\u1ea3 n\u0103ng bi\u1ec3u di\u1ec5n d\u1eef li\u1ec7u s\u1ed1 th\u00f4ng qua s\u1ef1 thay \u0111\u1ed5i pha c\u1ee7a t\u00edn hi\u1ec7u s\u00f3ng mang khi\u1ebfn n\u00f3 c\u00f3 gi\u00e1 tr\u1ecb trong c\u1ea3 t\u00ecnh hu\u1ed1ng giao ti\u1ebfp c\u00f3 d\u00e2y v\u00e0 kh\u00f4ng d\u00e2y. V\u1edbi nh\u1eefng nghi\u00ean c\u1ee9u v\u00e0 ti\u1ebfn b\u1ed9 kh\u00f4ng ng\u1eebng trong c\u00f4ng ngh\u1ec7, t\u01b0\u01a1ng lai c\u1ee7a PSK c\u00f3 v\u1ebb \u0111\u1ea7y h\u1ee9a h\u1eb9n, cung c\u1ea5p t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u cao h\u01a1n v\u00e0 hi\u1ec7u su\u1ea5t \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n. Khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00f9ng v\u1edbi m\u00e1y ch\u1ee7 proxy, giao ti\u1ebfp PSK c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c h\u01b0\u1edfng l\u1ee3i t\u1eeb quy\u1ec1n ri\u00eang t\u01b0, b\u1ea3o m\u1eadt v\u00e0 c\u00e2n b\u1eb1ng t\u1ea3i \u0111\u01b0\u1ee3c n\u00e2ng cao, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh s\u1ef1 k\u1ebft h\u1ee3p m\u1ea1nh m\u1ebd trong c\u00e1c m\u1ea1ng truy\u1ec1n th\u00f4ng d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i.<\/p>","protected":false},"featured_media":478422,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-478421","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Phase-shift keying: A Comprehensive Guide<\/mark>","faq_items":[{"question":"What is Phase-shift keying (PSK) modulation?","answer":"<p>Phase-shift keying (PSK) is a digital modulation technique used in telecommunications and data communication systems to transmit digital data over analog communication channels. It involves varying the phase of the carrier signal to represent the digital information.<\/p>"},{"question":"How did Phase-shift keying originate?","answer":"<p>The concept of using different phases of the carrier signal to represent information was first mentioned by Ralph Hartley in his 1928 paper titled \"Transmission of Information.\"<\/p>"},{"question":"How does Phase-shift keying work?","answer":"<p>PSK encodes digital data onto an analog carrier wave by changing the phase of the carrier signal according to the modulated data. The phase transitions between specific angles represent the binary information being transmitted.<\/p>"},{"question":"What are the advantages of Phase-shift keying?","answer":"<ul><li>Bandwidth Efficiency: PSK is more bandwidth-efficient than amplitude modulation techniques.<\/li><li>Robustness to Noise: PSK is relatively robust against noise and interference.<\/li><li>Spectral Efficiency: With higher-order PSK schemes, multiple bits can be transmitted per symbol, increasing data rate without increasing bandwidth.<\/li><li>Simple Demodulation: The demodulation process in PSK is straightforward.<\/li><\/ul>"},{"question":"What are the types of Phase-shift keying?","answer":"<p>The common PSK types include Binary Phase-shift Keying (BPSK), Quadrature Phase-shift Keying (QPSK), 8-PSK, and 16-PSK.<\/p>"},{"question":"Where is Phase-shift keying used?","answer":"<p>PSK finds applications in wireless communication (Wi-Fi, Bluetooth), digital broadcasting, and data storage technologies.<\/p>"},{"question":"What challenges does Phase-shift keying face?","answer":"<p>PSK modulation faces challenges in high-noise environments and multipath fading conditions, which can lead to transmission errors.<\/p>"},{"question":"How can proxy servers enhance Phase-shift keying communication?","answer":"<p>Proxy servers can enhance PSK communication by providing additional privacy, security, and load balancing features for data transmission.<\/p>"},{"question":"What is the future of Phase-shift keying?","answer":"<p>The future of PSK lies in improving its performance in noisy environments and overcoming fading challenges. Researchers are exploring advanced error correction techniques and adaptive modulation schemes for enhanced communication.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478421","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478421\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/478422"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=478421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}