Re: DRM - Solution to Flat Fading

Nicolas Croiset wrote:
> On Mon, 01 Aug 2005 00:50:54 GMT, "DAB sounds worse than FM"
> <dab.is@xxxxxxxxxxx> wrote:
>
>> Found this in a document "DAB is BAD" sent me about DRM which
>> proposes to use segmentation, similar to the way ISDB-T uses
>> segments:
>>
>> http://en.wikipedia.org/wiki/ISDB-T#Technical_specification_2
>>
>> Here's the DRM paper, and the segments idea is on pages 16-17:
>>
>> http://www.olonprogrammabank.nl/publiekdocs/LO_DIG_2002BIJLAGE4.pdf
>>
>> The segments could be spread out over a wider frequency range than in
>> that diagram, thus getting frequency diversity and avoiding flat
>> fading of the whole channel.
>>
>> Problem solved.



I should say that although this is a possible solution to Croiset's
objections, I don't consider it to be a significant problem in the first
place.


> except :
>
> The implementation of any such approach to spectrum usage would demand
> dramatic re-planning of the Band II (FM) spectrum.


Who is talking about using FM spectrum when FM isn't switched off????


> In the words of one
> DRM expert:
> It probably does though become a bit of nightmare to plan and
> regulate as soon as you have a significant number of users
> spread across the band and across the country.


"a bit of a nightmare" means that although it might be difficult, it is
possible.


> Problem not solved.


No, problem solved.


> PS : In the document they made confusions between 10kHz step and 100
> kHz step.


They can propose whatever they like in a proposal.


--
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.

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