Process_LCMV.m

function [Y,W,SetupStruc] = Process_LCMV(s,Transfer,SetupStruc)
K = SetupStruc.LCMV.K;
hop = SetupStruc.LCMV.hop;
win = hanning(K,'periodic');
win = win/sqrt(sum(win(1:hop:K).^2));
SetupStruc.LCMV.win = win;  % Preserve 'win' in 'SetupStruc'
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
N = size(s,2);
for i = 1:N
    X(:,:,i) = fft(enframe(s(:,i),win,hop)');
end
frame_N = size(X,2);
K_m = K/2+1;
Num = size(Transfer,3);
Y = zeros((frame_N-1)*hop+K,Num);
Y_f = zeros(size(X,1),size(X,2),Num);
WNG =zeros(K_m,Num);
%%%%%%%%%%%%%%%%%%%%%%%%%% Obtain processing matrix 'W'
theta = 10^-4;
W = zeros(Num,N,K_m);
for i = 2:K_m
    X_f = permute(X(i,:,:),[3 2 1]);
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    %%% LCMV processing, imposing the linear constraints to the angle of sources
    Steer = permute(Transfer(i,:,:),[2 3 1]);
    R = X_f*X_f'/frame_N;
    if rcond(R)<theta
        R = R+eye(N)*min(diag(R))*theta;
    end
    R_denominator = Steer'/R*Steer;
    if rcond(R_denominator)<theta
        R_denominator = R_denominator+eye(Num)*min(diag(R_denominator))*theta;
    end
    W_f = R\Steer/R_denominator;
    W_f = W_f';
    W(:,:,i) = W_f;   
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    WNG(i,:) = -10*log10(diag(W_f*W_f')');
    Y_ = W_f*X_f;
    Y_f(i,:,:) = Y_.';
    if(i~=K_m)
        Y_f(K+2-i,:,:) = Y_';
    end
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Recover signals
if(K/hop==2)
    win = ones(K,1);
end
for i = 1:Num
    Y(:,i) = overlapadd(real(ifft(Y_f(:,:,i)))',win,hop);
end
% autoPlot(WNG,'LCMV');
return;