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i amtrying to find the sum of N random variables each follow the noncentral chi-square distribution and they are i.i.d, i.e,

sum(y_i), i=1,...N

y_i is the RV and has a noncentral chi-square pdf

f[y](y) = (exp(-(H[i, d]+y)/sigma^2)*BesselJ(0, 2*sqrt(H[i, d]*y/sigma^4))/sigma^2

plz help me

regards

nidhal

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# Sum of noncentral chi-square RVs

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