----- Original Message ----- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
If you want to tout the advantages of having HM, the only way to make the argument is to show that the wide stream remains as robust as the wide channel always was, and then you add in a robust mode. If you use numbers for the wide stream that are less robust than previously, then those numbers don't mean a lot. I could give you even more Mb/s in the wide channel. So what?
One DVB paper I have claims a 3 dB difference between HM and non-HM 64QAM, 3/4 FEC 1/16 GI in an 8 MHz channel.
Another DVB paper of the same vintage claims 19.6 dB Gaussian for the LP stream in a 6 MHz channel for the NAB 2000 HM-COFDM demo.
The link was to show that in the real world, 3 dB is not a meaningful difference in reception in the far field. And again, for about the one thousanth time, it is a tradeoff, but one that each individual broadcaster can make to best fit their own business model, not one tradeoff made by an engineering committee and thrust upon the world.
John
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