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Coded Orthogonal Frequency Division Multiplexing - Revision history
2024-03-15T05:35:22Z
Revision history for this page on the wiki
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Kimdino: /* Links */
2006-02-23T00:30:30Z
<p><span dir="auto"><span class="autocomment">Links</span></span></p>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [http://www.bbc.co.uk/rd/pubs/papers/paper_15/paper_15.html A nice Article explaining the Magic of COFDM]</div></td>
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Kimdino
https://www.linuxtv.org/wiki/index.php?title=Coded_Orthogonal_Frequency_Division_Multiplexing&diff=5721&oldid=prev
Guidod: merge COFDM
2005-04-03T01:25:25Z
<p>merge COFDM</p>
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<td style="color: #202122; 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;"><div>Coded Orthogonal Frequency Division Multiplexing. Multiplexes many (e.g. QPSK- or QAM-) modulated signals in frequency domain.</div></td>
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<td style="color: #202122; 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;"><div><ins style="font-weight: bold; text-decoration: none;">The '''</ins>Coded Orthogonal Frequency Division Multiplexing<ins style="font-weight: bold; text-decoration: none;">''' (short '''COFDM''') is the modulation scheme used for [[DVB-T]]</ins>. Multiplexes many (e.g. <ins style="font-weight: bold; text-decoration: none;">[[</ins>QPSK<ins style="font-weight: bold; text-decoration: none;">]]</ins>- or <ins style="font-weight: bold; text-decoration: none;">[[</ins>QAM<ins style="font-weight: bold; text-decoration: none;">]]</ins>-) modulated signals in frequency domain.</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td>
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<td style="color: #202122; 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;"><div>COFDM is a quite sophisticated approach with many interesting qualities used in WLAN and [[DVB-T]] that transforms a block of a few thousand modulated signal samples via iFFT into the frequency domain and inserts well-known guard points into this spectrum.</div></td>
<td class="diff-marker" data-marker="+"></td>
<td style="color: #202122; 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;"><div>COFDM is a quite sophisticated approach with many interesting qualities used in WLAN and [[DVB-T]] that transforms a block of a few thousand modulated signal samples via <ins style="font-weight: bold; text-decoration: none;">[[</ins>iFFT<ins style="font-weight: bold; text-decoration: none;">]]</ins> into the frequency domain and inserts well-known guard points into this spectrum.</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Echoes and Multipath receiption effects will now disturb the signal, but due to the guard points the receiver can "equalize" these effects before the original signal gets recovered using a FFT.</div></td>
<td class="diff-marker"></td>
<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Echoes and Multipath receiption effects will now disturb the signal, but due to the guard points the receiver can "equalize" these effects before the original signal gets recovered using a FFT.</div></td>
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Guidod
https://www.linuxtv.org/wiki/index.php?title=Coded_Orthogonal_Frequency_Division_Multiplexing&diff=1344&oldid=prev
Guidod: +cat
2005-04-02T22:19:40Z
<p>+cat</p>
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<td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_3_0_lhs">⚫</a></td>
<td style="color: #202122; 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;"><div><a name="movedpara_1_0_rhs"></a><ins style="font-weight: bold; text-decoration: none;">== </ins>Links<ins style="font-weight: bold; text-decoration: none;"> ==</ins></div></td>
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<td style="color: #202122; 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;"><div>----</div></td>
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<td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_1_0_rhs">⚫</a></td>
<td style="color: #202122; 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;"><div><a name="movedpara_3_0_lhs"></a><del style="font-weight: bold; text-decoration: none;">''</del>Links<del style="font-weight: bold; text-decoration: none;">:''</del></div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [[Wikipedia:Coded_orthogonal_frequency_division_modulation|COFDM on Wikipedia, they call it Modulation, not Multiplexing?!?]]</div></td>
<td class="diff-marker"></td>
<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [[Wikipedia:Coded_orthogonal_frequency_division_modulation|COFDM on Wikipedia, they call it Modulation, not Multiplexing?!?]]</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [http://www.bbc.co.uk/rd/pubs/papers/paper_15/paper_15.html A nice Article explaining the Magic of COFDM]</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [http://www.bbc.co.uk/rd/pubs/papers/paper_15/paper_15.html A nice Article explaining the Magic of COFDM]</div></td>
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Guidod
https://www.linuxtv.org/wiki/index.php?title=Coded_Orthogonal_Frequency_Division_Multiplexing&diff=1152&oldid=prev
Holger at 13:31, 27 September 2004
2004-09-27T13:31:12Z
<p></p>
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<td style="color: #202122; 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;"><div>Coded Orthogonal Frequency Division Multiplexing. <del style="font-weight: bold; text-decoration: none;">A</del> <del style="font-weight: bold; text-decoration: none;">quite</del> <del style="font-weight: bold; text-decoration: none;">sophisticated</del> <del style="font-weight: bold; text-decoration: none;">approach</del> <del style="font-weight: bold; text-decoration: none;">in</del> <del style="font-weight: bold; text-decoration: none;">[[DVB</del>-<del style="font-weight: bold; text-decoration: none;">T]] that transforms a block of a few thousand</del> modulated <del style="font-weight: bold; text-decoration: none;">signal</del> <del style="font-weight: bold; text-decoration: none;">samples via iFFT into the</del> frequency domain<del style="font-weight: bold; text-decoration: none;"> and inserts well-known guard points into this spectrum</del>.</div></td>
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<td style="color: #202122; 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;"><div>Coded Orthogonal Frequency Division Multiplexing. <ins style="font-weight: bold; text-decoration: none;">Multiplexes</ins> <ins style="font-weight: bold; text-decoration: none;">many</ins> <ins style="font-weight: bold; text-decoration: none;">(e.g.</ins> <ins style="font-weight: bold; text-decoration: none;">QPSK-</ins> <ins style="font-weight: bold; text-decoration: none;">or</ins> <ins style="font-weight: bold; text-decoration: none;">QAM</ins>-<ins style="font-weight: bold; text-decoration: none;">)</ins> modulated <ins style="font-weight: bold; text-decoration: none;">signals</ins> <ins style="font-weight: bold; text-decoration: none;">in</ins> frequency domain.</div></td>
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<td style="color: #202122; 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;"><br /></td>
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<td style="color: #202122; 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;"><div>COFDM is a quite sophisticated approach with many interesting qualities used in WLAN and [[DVB-T]] that transforms a block of a few thousand modulated signal samples via iFFT into the frequency domain and inserts well-known guard points into this spectrum.</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Echoes and Multipath receiption effects will now disturb the signal, but due to the guard points the receiver can "equalize" these effects before the original signal gets recovered using a FFT.</div></td>
<td class="diff-marker"></td>
<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Echoes and Multipath receiption effects will now disturb the signal, but due to the guard points the receiver can "equalize" these effects before the original signal gets recovered using a FFT.</div></td>
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Holger
https://www.linuxtv.org/wiki/index.php?title=Coded_Orthogonal_Frequency_Division_Multiplexing&diff=566&oldid=prev
Holger at 13:27, 27 September 2004
2004-09-27T13:27:17Z
<p></p>
<p><b>New page</b></p><div>Coded Orthogonal Frequency Division Multiplexing. A quite sophisticated approach in [[DVB-T]] that transforms a block of a few thousand modulated signal samples via iFFT into the frequency domain and inserts well-known guard points into this spectrum.<br />
<br />
Echoes and Multipath receiption effects will now disturb the signal, but due to the guard points the receiver can "equalize" these effects before the original signal gets recovered using a FFT.<br />
<br />
''it would be nice to have the links to the defining standards here as well as some pictures visualizing the concept, the "echo" and "multipath" terms and the interference problem. A more verbose explanation would be nice, too.''<br />
<br />
<br />
----<br />
''Links:''<br />
<br />
* [[Wikipedia:Coded_orthogonal_frequency_division_modulation|COFDM on Wikipedia, they call it Modulation, not Multiplexing?!?]]<br />
<br />
* [http://www.bbc.co.uk/rd/pubs/papers/paper_15/paper_15.html A nice Article explaining the Magic of COFDM]</div>
Holger