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

[Mark Humphrey]

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