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		<id>https://tudien.vntelecom.org/w/index.php?action=history&amp;feed=atom&amp;title=QPSK</id>
		<title>QPSK - Lịch sử thay đổi</title>
		<link rel="self" type="application/atom+xml" href="https://tudien.vntelecom.org/w/index.php?action=history&amp;feed=atom&amp;title=QPSK"/>
		<link rel="alternate" type="text/html" href="https://tudien.vntelecom.org/w/index.php?title=QPSK&amp;action=history"/>
		<updated>2026-05-08T10:08:05Z</updated>
		<subtitle>Lịch sử thay đổi của trang này ở wiki</subtitle>
		<generator>MediaWiki 1.28.0</generator>

	<entry>
		<id>https://tudien.vntelecom.org/w/index.php?title=QPSK&amp;diff=1780&amp;oldid=prev</id>
		<title>Ctran: /* Tài liệu tham chiếu */</title>
		<link rel="alternate" type="text/html" href="https://tudien.vntelecom.org/w/index.php?title=QPSK&amp;diff=1780&amp;oldid=prev"/>
				<updated>2009-08-07T16:31:36Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Tài liệu tham chiếu&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&#039;diff-marker&#039; /&gt;
				&lt;col class=&#039;diff-content&#039; /&gt;
				&lt;col class=&#039;diff-marker&#039; /&gt;
				&lt;col class=&#039;diff-content&#039; /&gt;
				&lt;tr style=&#039;vertical-align: top;&#039; lang=&#039;vi&#039;&gt;
				&lt;td colspan=&#039;2&#039; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Phiên bản cũ&lt;/td&gt;
				&lt;td colspan=&#039;2&#039; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Phiên bản lúc 16:31, ngày 7 tháng 8 năm 2009&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l6&quot; &gt;Dòng 6:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Dòng 6:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Thông tin thêm&lt;/div&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Thông tin thêm&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;== Tài liệu tham chiếu ==&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;QPSK (Quadrature phase-shift keying) thỉnh thoảng cũng đươc gọi là PSK, 4-PSK, 4-QAM. QPSK là dùng trục tọa độ cắt vòng tròn ra 4 pha (phases) để chuyễn đổi 2 bits thành một symbol.&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;[http://upload.wikimedia.org/wikipedia/commons/8/8f/QPSK_Gray_Coded.svg]&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Như thế mổi lần phase shift được đưa vào trục thì 2 bits được dùng thế nên lượng trữ tăng lên gấp đôi.&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;[[Phương_tiện:http://en.wikipedia.org/wiki/File:QPSK_Gray_Coded.svg]]&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Liên kết ngoài ==&lt;/div&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Liên kết ngoài ==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Xem thêm ==&lt;/div&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Xem thêm ==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Ctran</name></author>	</entry>

	<entry>
		<id>https://tudien.vntelecom.org/w/index.php?title=QPSK&amp;diff=619&amp;oldid=prev</id>
		<title>Nvqthinh: Qpsk đổi thành QPSK: viết hoa</title>
		<link rel="alternate" type="text/html" href="https://tudien.vntelecom.org/w/index.php?title=QPSK&amp;diff=619&amp;oldid=prev"/>
				<updated>2007-10-16T11:12:19Z</updated>
		
		<summary type="html">&lt;p&gt;Qpsk đổi thành QPSK: viết hoa&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;tr style=&#039;vertical-align: top;&#039; lang=&#039;vi&#039;&gt;
				&lt;td colspan=&#039;1&#039; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Phiên bản cũ&lt;/td&gt;
				&lt;td colspan=&#039;1&#039; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Phiên bản lúc 11:12, ngày 16 tháng 10 năm 2007&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&#039;2&#039; style=&#039;text-align: center;&#039; lang=&#039;vi&#039;&gt;&lt;div class=&quot;mw-diff-empty&quot;&gt;(Không có sự khác biệt)&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</summary>
		<author><name>Nvqthinh</name></author>	</entry>

	<entry>
		<id>https://tudien.vntelecom.org/w/index.php?title=QPSK&amp;diff=614&amp;oldid=prev</id>
		<title>Nvqthinh vào lúc 11:00, ngày 16 tháng 10 năm 2007</title>
		<link rel="alternate" type="text/html" href="https://tudien.vntelecom.org/w/index.php?title=QPSK&amp;diff=614&amp;oldid=prev"/>
				<updated>2007-10-16T11:00:50Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&#039;diff-marker&#039; /&gt;
				&lt;col class=&#039;diff-content&#039; /&gt;
				&lt;col class=&#039;diff-marker&#039; /&gt;
				&lt;col class=&#039;diff-content&#039; /&gt;
				&lt;tr style=&#039;vertical-align: top;&#039; lang=&#039;vi&#039;&gt;
				&lt;td colspan=&#039;2&#039; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Phiên bản cũ&lt;/td&gt;
				&lt;td colspan=&#039;2&#039; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Phiên bản lúc 11:00, ngày 16 tháng 10 năm 2007&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot; &gt;Dòng 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Dòng 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Thể loại:&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Viễn Thông&lt;/del&gt;]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Thể loại:&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;viễn thông&lt;/ins&gt;]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Thể loại:&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Truyền Thông Kỹ Thuật Số&lt;/del&gt;]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Thể loại:&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;truyền thông kỹ thuật số&lt;/ins&gt;]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#039;&amp;#039;&amp;#039;QPSK&amp;#039;&amp;#039;&amp;#039; viết tắt của từ &amp;#039;&amp;#039;&amp;#039;Quadature Phase Shift Keying&amp;#039;&amp;#039;&amp;#039;, tiếng Việt gọi là &amp;#039;&amp;#039;&amp;#039;điều chế pha trực giao&amp;#039;&amp;#039;&amp;#039;. QPSK là 1 kỹ thuật điều chế tín hiệu số, mã hóa 2 bit thành 1 symbols.&amp;#160; &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class=&#039;diff-marker&#039;&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#039;&amp;#039;&amp;#039;QPSK&amp;#039;&amp;#039;&amp;#039; viết tắt của từ &amp;#039;&amp;#039;&amp;#039;Quadature Phase Shift Keying&amp;#039;&amp;#039;&amp;#039;, tiếng Việt gọi là &amp;#039;&amp;#039;&amp;#039;điều chế pha trực giao&amp;#039;&amp;#039;&amp;#039;. QPSK là 1 kỹ thuật điều chế tín hiệu số, mã hóa 2 bit thành 1 symbols.&amp;#160; &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Nvqthinh</name></author>	</entry>

	<entry>
		<id>https://tudien.vntelecom.org/w/index.php?title=QPSK&amp;diff=577&amp;oldid=prev</id>
		<title>Tuan Duc: New page: Thể loại:Viễn Thông Thể loại:Truyền Thông Kỹ Thuật Số  &#039;&#039;&#039;QPSK&#039;&#039;&#039; viết tắt của từ &#039;&#039;&#039;Quadature Phase Shift Keying&#039;&#039;&#039;, tiếng Việt gọi là &#039;&#039;&#039;điề...</title>
		<link rel="alternate" type="text/html" href="https://tudien.vntelecom.org/w/index.php?title=QPSK&amp;diff=577&amp;oldid=prev"/>
				<updated>2007-10-10T14:04:57Z</updated>
		
		<summary type="html">&lt;p&gt;New page: &lt;a href=&quot;/w/index.php?title=Th%E1%BB%83_lo%E1%BA%A1i:Vi%E1%BB%85n_Th%C3%B4ng&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;Thể loại:Viễn Thông (trang chưa được viết)&quot;&gt;Thể loại:Viễn Thông&lt;/a&gt; &lt;a href=&quot;/w/index.php?title=Th%E1%BB%83_lo%E1%BA%A1i:Truy%E1%BB%81n_Th%C3%B4ng_K%E1%BB%B9_Thu%E1%BA%ADt_S%E1%BB%91&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;Thể loại:Truyền Thông Kỹ Thuật Số (trang chưa được viết)&quot;&gt;Thể loại:Truyền Thông Kỹ Thuật Số&lt;/a&gt;  &amp;#039;&amp;#039;&amp;#039;QPSK&amp;#039;&amp;#039;&amp;#039; viết tắt của từ &amp;#039;&amp;#039;&amp;#039;Quadature Phase Shift Keying&amp;#039;&amp;#039;&amp;#039;, tiếng Việt gọi là &amp;#039;&amp;#039;&amp;#039;điề...&lt;/p&gt;
&lt;p&gt;&lt;b&gt;Trang mới&lt;/b&gt;&lt;/p&gt;&lt;div&gt;[[Thể loại:Viễn Thông]]&lt;br /&gt;
[[Thể loại:Truyền Thông Kỹ Thuật Số]]&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;&amp;#039;QPSK&amp;#039;&amp;#039;&amp;#039; viết tắt của từ &amp;#039;&amp;#039;&amp;#039;Quadature Phase Shift Keying&amp;#039;&amp;#039;&amp;#039;, tiếng Việt gọi là &amp;#039;&amp;#039;&amp;#039;điều chế pha trực giao&amp;#039;&amp;#039;&amp;#039;. QPSK là 1 kỹ thuật điều chế tín hiệu số, mã hóa 2 bit thành 1 symbols.  &lt;br /&gt;
&lt;br /&gt;
Thông tin thêm&lt;br /&gt;
&lt;br /&gt;
== Tài liệu tham chiếu ==&lt;br /&gt;
&lt;br /&gt;
== Liên kết ngoài ==&lt;br /&gt;
&lt;br /&gt;
== Xem thêm ==&lt;/div&gt;</summary>
		<author><name>Tuan Duc</name></author>	</entry>

	</feed>