Reply by Vladimir Vassilevsky●July 11, 20082008-07-11
cpshah99 wrote:
> Which is better: Reed Solomon coding or convolutional code with SOVA
> decoding?
It depends. BTW, Reed Solomon codes can be decoded with SOVA as well.
Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com
Reply by Ben Jackson●July 11, 20082008-07-11
On 2008-07-11, cpshah99 <cpshah99@rediffmail.com> wrote:
>
> Which is better: Reed Solomon coding or convolutional code with SOVA
> decoding?
Hi All
Sorry to ask different question.
Which is better: Reed Solomon coding or convolutional code with SOVA
decoding?
Thanks
Regards,
Chintan
Reply by Ben Jackson●July 11, 20082008-07-11
On 2008-07-11, shimi <itzic100@yahoo.com> wrote:
> I'm interested in using RS- Reed solomon codes with erasures.
>
> I know the RS code can correct 2g+e=n-k, where g is erasure and e is
> error.
Actually it's 2e+g=n-k. You can correct more erasures than errors.
Think about it this way: The error correcting power can be applied to
both *finding* and *fixing* (the error case) or just *fixing* if you
supply the location information using outside information.
> My system can find the erasures with high probability.
You will always gain from that.
--
Ben Jackson AD7GD
<ben@ben.com>
http://www.ben.com/
Reply by Vladimir Vassilevsky●July 11, 20082008-07-11
shimi wrote:
> Hello,
>
> I'm interested in using RS- Reed solomon codes with erasures.
>
> I know the RS code can correct 2g+e=n-k, where g is erasure and e is
> error.
>
> My system can find the erasures with high probability.
> My question is, if the system can detect X erasures but 50% of them are
> correct.
> Meaning they were mistakenly detected as erasures.
> Will I earn something using decoder with erasure or using regular decoding
> ?
>
> Another question, if from the X erasures 75% are correct.
> Will I earn something ?
In general, any apriori knowledge about the errors improves the
operation of the decoder. There is a family of algorithms of different
complexity for decoding of the RS codes with the use of the reliability
information for every symbol. Depending on the algorithm and the error
rate, you can expect the gain of 0.5 to 3dB compared to the hard
decision algebraic decoding.
Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com
Reply by ●July 11, 20082008-07-11
On Jul 11, 11:53 am, "shimi" <itzic...@yahoo.com> wrote:
> Hello,
>
> I'm interested in using RS- Reed solomon codes with erasures.
>
> I know the RS code can correct 2g+e=n-k, where g is erasure and e is
> error.
>
> My system can find the erasures with high probability.
> My question is, if the system can detect X erasures but 50% of them are
> correct.
> Meaning they were mistakenly detected as erasures.
> Will I earn something using decoder with erasure or using regular decoding
> ?
>
> Another question, if from the X erasures 75% are correct.
> Will I earn something ?
>
> thanks
>
> Itzic
Probably depends upon the error rate of the mistakenly-classified
bits. If all of the bits that your receiver incorrectly marks as
erasures are correct, then you would be best served to include them.
If the error rate is high for those bit positions, then you're best
off just marking them as erasures. Other error rates give you a case
in between the two extremes. Do you have any more information?
Jason
Reply by shimi●July 11, 20082008-07-11
Hello,
I'm interested in using RS- Reed solomon codes with erasures.
I know the RS code can correct 2g+e=n-k, where g is erasure and e is
error.
My system can find the erasures with high probability.
My question is, if the system can detect X erasures but 50% of them are
correct.
Meaning they were mistakenly detected as erasures.
Will I earn something using decoder with erasure or using regular decoding
?
Another question, if from the X erasures 75% are correct.
Will I earn something ?
thanks
Itzic