[opendtv] Re: Opinion: Mobile TV's New Free Market Economy
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 19 Mar 2009 20:28:25 -0400
Bert -
I do not have access to DVB/COFDM to test. Do you now believe that you
can get equivalent after-FEC throughput (spectral efficiency) with 8vsb
using non-directional antennas at the same power and spectrum width?
- Tom
Manfredi, Albert E wrote:
> Bob Miller wrote:
>
>> Doesn't almost everything except 8-VSB and M/H? I was
>> responding to the antenna on each ear for mobile 8-VSB or
>> M/H reception I thought.
>
> You need an antenna for COFDM just as you do for QAM or VSB. The shape
> and size are more a function of wavelength than anything else.
>
> In the early days of 8T-VSB, it was the p*ss-poor multipath compensation
> performance of the receivers that made it seem like VSB required a
> different antenna, or more accurate aim, or whatever. Those days are
> gone, at least for the better receivers.
>
> Besides which, when John Shutt receives XM-Radio, as far as I know, ALL
> he is getting is QPSK, single frequency, from the satellite. No COFDM.
> Or do you guys have terrestrial stations in Lansing these days, John?
>
> Bert
>
>
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