[BC] FCC Deletes digital report from today's meeting

[CHARLES HUTTON]

Mark:

The idea here was to refute the claim that the required SINR is the same for 
"all digital flavors" and is dependent on the modulation type. The three 
listed types were intended to indicate there is a different answer for each.

The basic structure (primary, secondary, tertiary with 64-16-QPSK) wasn't 
the question. Rather, I'd like to know the SINR (using AWGN) where each part 
of the digital system fails.


Chuck

>Date: Mon, 17 Jul 2006 09:00:33 -0400
>From: "Mark Humphrey" <mark3xy at gmail.com>
>Subject: Re: [BC] FCC Deletes digital report from today's meeting
>To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
>Message-ID:
>	<74b029b80607170600p1b3d50b2w5f8c274d1af5eeff at mail.gmail.com>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>On 7/17/06, Chuck Hutton <charlesh3 at msn.com> wrote:
>
> > As for "16 - 17 dB (any flavor)", the SINR needed to decode depends 
>greatly
> > on the modulation (QPSK? 16QAM? 64QAM?), coding gain, interleaver, sync
> > algorithm, etc.
>
>Dave Wilson's paper "IBOC Digital Radio Receiver Fundamentals"
>presented at the 2006 NAB conference includes a detailed explanation
>of the AM system for anyone interested.
>
>The primary sidebands (the pair furthest out from the analog channel,
>and most susceptible to first-adjacent interference) are using 64 QAM
>-- while the secondary pair are 16 QAM and the tertiary subcarriers
>(buried under the analog) are QPSK.
>
>Mark
>