adaptation of two method of llr calculation

Dear all, I have problem in the adaptation of llr calculation in the below function to the folowing clipping method {kappa = H_clip/P_clip;% the ratio kappa is given numerically %ll = P_clip*r.*(abs(r)<kappa)+H_clip*sign(r).*(abs(r)>=kappa);}

{function ll = calc_ll(r,sigma_n2,constellation,mapping) mod_idx = log2(length(constellation)); dist = zeros(2^mod_idx,length(r)); % for idx = 1:(2^mod_idx) dist(idx,:) = (real(r) - (real(constellation(idx)))).^2 + (imag(r) - (imag(constellation(idx)))).^2; end exp_mat = exp(-1./sigma_n2.*dist); ll = zeros(mod_idx,length(r)); for idx = 1:mod_idx ll(mod_idx-idx+1,:) = log(sum(exp_mat((bitget(mapping,idx)==0),:),1)) ... - log(sum(exp_mat((bitget(mapping,idx)==1),:),1)); end ll=ll(:);}

[Star Strider]

First, that does not look like valid MATLAB code to me.

Second, I cannot figure out what you want to do by looking at it. Please tell us what you want to do (where you are starting, what you want as a result, and how you want to get there).

[John D'Errico]

You say only that you have a problem. But what really is your problem?

The phrase "adaptation of llr calculation" has no meaning to anyone but you. Explain what you need if you want help.