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  #76  
Old 04-06-2015, 08:43 PM
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dtvmcdonald dtvmcdonald is offline
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As to efficient use of spectrum, COFDM and QAM are identical, **IF**
COFDM uses no guard interval, in which case multipath removal has
to be done using the same methods as ATSC. ATSC is less efficient by a
bit because of the useless lower sideband (using the same coding
for COFDM and QAM as NTSC, of course, which can be done using plain
4-VSB for NTSC and 16QAM for the others including the COFDM carriers.)
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  #77  
Old 01-13-2018, 06:16 PM
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Telecolor 3007 Telecolor 3007 is offline
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