http://www.tvtechnology.com/atsc3/0031/atsc-30-exploiting-physical-layer-for-new-broadcast-opportunities/280095
This article more appropriately focuses its attention on the physical layer
ONLY, in describing ATSC 3.0, which IMO is legitimate. Of course, we are still
talking about a one-way broadcast link.
Unlike the previous (misleading) articles, this one says, for instance,
"carried in IP packets *or* as an MPEG transport stream," and then mentioning
the new ATSC link layer protocol that makes this possible. This, and
potentially other options, is described clearly in the new standard A/330 (not
mentioned in the article):
"ALP allows encapsulation of any type of packet, including common ones such as
IP [4] packets and MPEG-2 TS [6] packets."
Figure 4 is an interesting graph, comparing ATSC 3.0 with ATSC 1.0 physical
layers, for robustness vs spectral efficiency, which IMO is *the* main benefit
of ATSC 3.0. But even there, we have already discussed the fact that the way
FEC is used in ATSC 1.0 can be improved, purely in receivers, to achieve an
improvement of something on the order of 1.5 dB or so, which would bring that
one data point of ATSC 1.0 spectral efficiency much closer to ATSC 3.0.
Another point is that according to A/322, it appears that only 8K, 16K, and 32K
modes are supported? A little strange, considering that mobility is supposedly
paramount.
Bert
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