RE: simulation results from octave wrong!!!

[Cronie, H.S. (Harm)]

Hello Freddie,

If you look at the Octave results, the bit error rates are >0.5. This cannot be correct. This would mean that you can always get a lower BER when you flip all the bits. And of course the BER should decrease with increasing SNR. Actually when you flip all the bits from the Octave results, it seems that you will get BERs close to the ones obtained with Matlab. Maybe somewhere there is an error in the mapping from bits to modulation symbols.

Good luck!

Harm

-----Original Message-----
From: Muthiah Annamalai [mailto:address@hidden]
Sent: Thu 8/2/2007 4:26 PM
To: Aquil H. Abdullah
Cc: Freddie Hamatanga; address@hidden
Subject: Re: simulation results from octave wrong!!!

Check # of packets in Octave simulation. Using Law of large numbers, I think
it applies here, and youre looking at small samples of Octave codes.

Generally, the burden of proof is yours. Octave, almost always is never the
source of problems.

Thanks,
Muthu


On 8/2/07, Aquil H. Abdullah <address@hidden> wrote:
>
> Hello Freddie,
>   If you would like assistance you should provide a code sample, just
> looking at the results isn't very helpful.
>
> On 8/2/07, Freddie Hamatanga <address@hidden> wrote:
>
> > I installed correctly Octave 2.9.13 with the Signal and Communication
> > toolboxes, but when I run a Wireless LAN simulation programme, the results
> > are very different from those obtained from matlab. What could be the
> > problem? please help!!
> >
> > OCTAVE RESULTS
> >  results from ofdm11g_RS.m
> >  Multipath?  Y  Bluetooth?  Y
> >  Trms 75 Actual PSDU Length 380 bytes  Data rate 18
> >  Codeword length255 Dataword length 191 Number of correctable errors 32
> >  Bluetooth SIR: 9 Number of erasures: 0
> > # Packets    Eb/No        BER                     PER
> > 100                0             0.808694           1.000000
> > 100                5             0.902395           1.000000
> > 100                10           0.957872           1.000000
> > 100                15           0.986852           1.000000
> > 100                20           0.996711           1.000000
> > 100                25           0.999372           1.000000
> > 100                30           0.998905           1.000000
> > 100                35           0.999678           1.000000
> > 100                40           0.999145           1.000000
> >
> > MATLAB RESULTS
> >  results from ofdm11g_RS.m
> >  Multipath?  Y  Bluetooth?  Y
> >  Trms 75 Actual PSDU Length 380 bytes  Data rate 18
> >  Codeword length255 Dataword length 191 Number of correctable errors 32
> >  Bluetooth SIR: 9 Number of erasures: 0
> > # Packets           Eb/No        BER             PER
> > 100                         0           0.203326       1.000000
> > 103                         5           0.100329       0.970874
> > 131                         10           0.037475       0.763359
> > 259                         15           0.011161       0.386100
> > 672                         20           0.003115       0.148810
> > 1167                       25            0.001631       0.085690
> > 1647                        30           0.000990       0.060716
> > 1760                        35           0.000976       0.056818
> > 1897                        40           0.000889       0.052715
> >
> >
> >
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> --
> Aquil H. Abdullah
> address@hidden
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