[opendtv] Re: Qualcom OFDM networks with MediaFlo
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 15 Nov 2004 11:55:55 -0500
At 2:08 PM -0500 11/11/04, Manfredi, Albert E wrote:
>As of now, the 50 KW tall sticks Bob mentions might or
>might not provide market coverage, depending on a lot
>of factors (how many, how high, what bit rate they
>want to transmit, how many 2-way channels they want
>to provide simutaneously). Impossible to say whether
>30 KW sticks are adequate for the TV portion.
First, there will NOT be ANY two-way channels; this is an overlay
network that augments the existing CDMA networks with "small cells."
I am not certain, but it appears form the literature I read (and
provided links to) that an operator might be able to use the COFDM
network to deliver the forward portion of a two way transaction,
especially if the bits are being sent to a multicast group. To the
extent possible, the goal is to off-load big data transactions to the
COFDM network to free up bandwidth for the two-way network.
As Bob indicated, 50KW is the maximum that could be used for any cell
in this network. Bob also indicated that lower power levels may be
more typical (10-30 KW). The articles I cited indicated that each
market would have at least 2-3 cells, which suggests a small number
of cells similar to other COFDM/SFN deployments. As the tests that
Viacel has been conducting suggest, it does not take high power
levels - what is important is to cover the market with signals that
are above the reception threshold. In many cases this will be done
best with 2-5 transmitters.
>
>Whether it's worth while to use COFDM at all, or to
>go with the all-cdma2000 plan, is completely dependent
>on the details.
Which were provided in substantial detail. You simply chose to argue
in the face of the details that were provided.
Regards
Craig
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