[BC] FCC Deletes digital report from today s meeting

[Robert Meuser]

The fact is that there are three digital broadcasts systems - IBOC DRM 
and Eurkea. Two of the three use a similar combination of differing 
modulation schemes and do in fact work with around a 16-17 db D/U. This 
is a very well documented fact. The third system uses none of the 
schemes you list.

R


CHARLES HUTTON wrote:

> 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
>>
>
>
>
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