Another DMT Q: 180 degree phase reversals

Hi all,

Ive come to another promblem with the project I'm doing on DSL. I can't seem 
to figure out if a 180 degree phase reversal (hardware inversion) will make 
the demodulation of the DMT signal impossible.

As I see it there will be a problem with phaseshifts that holds the carrier 
waveform "positive" for more than a half period, like the QAM modulation on 
the picture.

http://www.brantacan.co.uk/Qam.jpg

But how will it affect the DMT ?

Thanks in advance

--
Morten 

Morten M. J�rgensen wrote:
> Hi all,
> 
> Ive come to another promblem with the project I'm doing on DSL. I can't seem 
> to figure out if a 180 degree phase reversal (hardware inversion) will make 
> the demodulation of the DMT signal impossible.
> 
> As I see it there will be a problem with phaseshifts that holds the carrier 
> waveform "positive" for more than a half period, like the QAM modulation on 
> the picture.
> 
> http://www.brantacan.co.uk/Qam.jpg
> 
> But how will it affect the DMT ?
> 
> Thanks in advance

Morten,

I don't know what DMT is, but signal inversion shouldn't be a problem 
for demodulation and can't be fatal. You can also invert a sign in software.

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

Morten M. J�rgensen wrote:
> Hi all,
> 
> Ive come to another promblem with the project I'm doing on DSL. I can't seem 
> to figure out if a 180 degree phase reversal (hardware inversion) will make 
> the demodulation of the DMT signal impossible.

I've always found the demodulation of a DMT signal 
impossible.  If you know what I mean, shame on you.  :-)

Sorry, that's an in joke for some who have had a certain 
illicit experience.


Bob
-- 

"Things should be described as simply as possible, but no 
simpler."

                                              A. Einstein

>Sorry, that's an in joke for some who have had a certain
> illicit experience.

Damn, why was that the first thing I thought of as well...

porterboy76@yahoo.com wrote:
>>Sorry, that's an in joke for some who have had a certain
>>illicit experience.
> 
> 
> Damn, why was that the first thing I thought of as well...


I'll bet _anyone_ who has had the experience would.  :-)


Bob
-- 

"Things should be described as simply as possible, but no 
simpler."

                                              A. Einstein