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mutah
1

The inverse of the Marcum-Q function

Asked by mutah
on 1 Oct 2013
Latest activity Commented on by Muhammad Adil on 17 Apr 2018
can any one help me on my problem which is how to get the inverse of marcum Q function

  1 Comment

working on same problem bro ..... read this "Approximate Inversion of Marcum Q function" by Carl W helstorm, maybe it will help

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1 Answer

Answer by Wayne King
on 1 Oct 2013
Edited by Wayne King
on 1 Oct 2013

Do you have the Communications System Toolbox?
See the help for qfuncinv.m
If you don't have the CST, you can use erfcinv.m
x = [0.5000 0.1587 0.0228];
y = sqrt(2) * erfcinv(2*x);

  1 Comment

mutah
on 1 Oct 2013
my dear i mean the inverse of this equation :
Q_m(a,b) = 1/a^(m-1) * integral from b to inf of
[x^m * exp(-(x^2+a^2)/2) * I_(m-1)(ax)] dx,
where I_(m-1)() is the modified Bessel function of the first kind, of
order m-1.

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