DRM Extension Date's Moved Forwards
- From: "DAB sounds worse than FM" <dab.is@xxxxxxxxxxx>
- Date: Mon, 29 Aug 2005 19:56:30 GMT
http://www.drm.org/system/technicalaspect.php
"DRM is the world's only, non-proprietary digital radio system for
short-wave, AM/medium-wave and long-wave. It has been endorsed by the
ITU, IEC and ETSI. While DRM currently covers the broadcasting bands
below 30 MHz, the DRM consortium voted in March 2005 to begin the
process of extending the system to the broadcasting bands up to 120 MHz.
The design, development and testing phases are expected to be completed
by 2007-2009."
They first said it would be 2008-2010, so it's moved forwards a year.
Still nowhere good enough. How can they seriously suggest that it could
possibly take 3.5 years to extend an already designed system?
Here's what they have to do:
* Decide how many subcarriers and the subcarrier spacing so that the
system can handle the higher Doppler shifts at higher frequencies.
Simulate the changes and validate the changes. (the subcarrier spacing
determines the duration of the useful part of the OFDM symbol, Tu, due
to the relationship in OFDM that subcarrier spacing = 1/Tu)
* decide the new guard interval durations
* Ask for proposals for changes to the FEC coding. Simulate the
proposals and validate the proposals.
How long does all that take to implement? That amount of work (excluding
the validation) isn't even worthy of an MSc project. They could easily
get all of it done within 12 months *if they wanted to*.
--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info
Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/freeview_receivers.htm
http://www.digitalradiotech.co.uk/dab_digital_radios.htm
http://www.digitalradiotech.co.uk/mp3_players_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp3_players_large_capacity.htm
.
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