Re: So tired of waiting for a decent signal...

Richard Evans wrote:
Richard L wrote:


As always, you're letting yourself be mesmerised by bit rates and
spectrum efficiencies at the expense of functional considerations.

Who needs 5 Gbit/s in a radio broadcast system? And who would be
willing to restrict their travel to walking speeds in order to have
it? What would the battery life be like? And how expensive would it
be to cover Scotland and Wales? iBurst and its cousins are very
clever, but they're not there to do the same job as DAB.


I think that any broadcasts system would need to be receivable on a
simple aerial, otherwise the general public wont bother with it.

However that doesn't rule out the possibility of using a reasonably
sophisticated aerial system for the transmitter, which may lead to
some improvements in spectral efficiency.

As for restricting travel to walking speeds, Steve's post did say
something about a broadcasts system not being able to reach such a
high level of spectral efficiency as the example he gave. So I think
he made it obvious enough that practical considerations would need to
be met. Perhaps in your eagerness to criticise you didn't notice that
part of his post.

In the end I don't know what sort of efficiency improvements are
possible in a broadcast system, but if better systems exist then they
ought to be considered.


Richard L is in my killfile, so could you tell him from me that the 4G
prototype system is a prototype system, hence why it's only been tested at
low speeds so far; that it's not that anybody needs 5 Gbps personally, but
when you add up all the people in a mobile phone base station cell then they
wouldn't say not to true broadband download speeds; that the maximum
download speed doesn't need to be used if there's not the demand, so they'd
just reduce the modulation or code rate or reduce the power if there wasn't
the demand; and overall, it shows what level of spectral efficiency is
possible compared to what we have today, so it would be easy to stream a
puny 128 kbps radio station via the Internet on the 4G system if we so
desire.

It's really just about what's possible in terms of spectral efficiency, so
all we need is a broadcast system that uses a high spectral efficiency and
DAB/DAB+ will be looked upon as being the incredibly inefficient systems
that they really are.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info


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Relevant Pages

  • Re: So tired of waiting for a decent signal...
    ... spectrum efficiencies at the expense of functional considerations. ... Who needs 5 Gbit/s in a radio broadcast system? ... high level of spectral efficiency as the example he gave. ... Also presumably since most mobile phones these days have their aerial built in, then it would be OK for the phones to use a more complicated aerial system,. ...
    (alt.radio.digital)
  • Re: So tired of waiting for a decent signal...
    ... willing to restrict their travel to walking speeds in order to have ... However that doesn't rule out the possibility of using a reasonably sophisticated aerial system for the transmitter, which may lead to some improvements in spectral efficiency. ... So I think he made it obvious enough that practical considerations would need to be met. ... In the end I don't know what sort of efficiency improvements are possible in a broadcast system, but if better systems exist then they ought to be considered. ...
    (alt.radio.digital)