[opendtv] Re: Ed Williams 1999 Sinclair Baltimore Report
- From: Bob Miller <bob@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 26 Mar 2005 09:59:39 -0500
And after being criticized that COFDM didn't have the highest bit rate
because they chose 18.66 Mbps in these test, Sinclair went to 19.76 Mbps
in the demonstration at the hearings the following summer where the bow
tie antenna was paraded around the room.
Bob Miller
Mark Schubin wrote:
>The Sinclair tests were conducted in the same 6 MHz channel through an
>filter meeting FCC requirements. The exciters were swapped between
>8-VSB and COFDM. There was no interpretation involved in this. Ed
>noted the extensive test equipment that was available to those of us
>participating in the testing to verify the channel bandwidth.
>
>TTFN,
>Mark
>
>
>Terry Harvey wrote:
>
>
>
>>Note that the way some may read Ed's post may be misinterpreted.
>>
>>My interpretation is that the gross data rate was 24.88Mb/s for COFDM in a
>>slightly greater bandwidth than 8VSB, such that it would not fit in a six
>>MegaHertz channel. The net data rate was 18.66Mb/s. (The 1/8 guard interval
>>I expect eats up available bandwidth).
>>
>>8VSB gross data rate is approx 31 Mb/s in a narrower channel and the net
>>data rate is 19.39 Mb/s. This means more FEC has been applied to 8VSB
>>transmission.
>>
>>As the pre-adaptive equalization processes improve, does this not prove
>>that 8VSB will have in future greater data rate vs bandwidth efficiency for
>>the same robustness of reception?
>>
>>Terry Harvey
>>
>
>
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