Importance of GNU Scientific Library (GSL)

[Jeremy Mack]

Hello,



I am trying to simulating a WiFi network with directional antennas but when
I run my code I get the following error:



gsl: qags.c:543: ERROR: number of iterations was insufficient
Default GSL error handler invoked.



I traced the error back to an integration function from the GSL library. I
tried altering the function but nothing seems to fix it. The only way I
found to get around the problem is to remove the GSL library. Documentation
says this library is used to support more accurate WiFi error models. I was
wondering if anyone knew how important this library is for accurate results.



If it decreases the error from 5% to 2% then I am alright with my decision,
but if it decreases it from like 20% to 5% I will need to find another
alternative.



Thanks,



Jeremy

[Tom Henderson]

Post by Jeremy Mack
Hello,
I am trying to simulating a WiFi network with directional antennas
gsl: qags.c:543: ERROR: number of iterations was insufficient
Default GSL error handler invoked.
I traced the error back to an integration function from the GSL
library. I tried altering the function but nothing seems to fix it.
The only way I found to get around the problem is to remove the GSL
library. Documentation says this library is used to support more
accurate WiFi error models. I was wondering if anyone knew how
important this library is for accurate results.
If it decreases the error from 5% to 2% then I am alright with my
decision, but if it decreases it from like 20% to 5% I will need to
find another alternative.

The difference is only in the CCK 5.5 and 11 Mb/s rates, and the
difference should be small; the non-GSL approximations are close, but we
don't remember offhand.

There is some additional documentation on the 802.11b error models
here:

http://www.nsnam.org/~pei/80211b.pdf

I think it could be better documented what the difference is; I'll try
to work on this for the future.

- Tom