Process_LCMV_AESB.m

function [Y,W,SetupStruc] = Process_LCMV_AESB(s,Transfer,SetupStruc)
K = SetupStruc.LCMV_AESB.K;
hop = SetupStruc.LCMV_AESB.hop;
win = hanning(K,'periodic');
win = win/sqrt(sum(win(1:hop:K).^2));
SetupStruc.LCMV_AESB.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);
% sign_MVDR=0;sign_LCMV=0;sign = zeros(K_m,1);
sign_zero=0;sign_N=0;sign_Num=0;
for i = 2:K_m
    X_f = permute(X(i,:,:),[3 2 1]);
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    %%% LCMV processing, imposing the linear constraints to the angle of sources
    W_f = zeros(N,Num);
    Steer = permute(Transfer(i,:,:),[2 3 1]);
    [E,D] = PCA(X_f);
    Num_PCA = size(D,1);
    [~,adaD] = PCA(X_f,1,N,D(1,1)*theta);
    aNum = size(adaD,1);
    if(aNum>Num) aNum = Num;sign_N=sign_N+1;end
    if(aNum==Num) sign_Num = sign_Num+1; end
    if(Num_PCA<1) 
        R_inv = eye(N);
        sign_zero=sign_zero+1;
    else
        if(aNum>Num_PCA)
            aNum = Num_PCA;
        end
        E = E(:,1:aNum);
        D = D(1:aNum,1:aNum);
        if(~isempty(find(diag(D)<theta, 1)))
            D = D+min(diag(D))*eye(aNum);
        end 
        R_inv = E/D*E';
    end
    R_denominator = Steer'*R_inv*Steer;
    if(rcond(Steer'*Steer)<theta || rcond(R_denominator)<theta)   %%% Judge the covariance matrix of steering vector whether full-rank, 
        for j = 1:Num                                             %%% otherwise using MVDR
            h = Steer(:,j);
            W_f(:,j) = R_inv*h/(h'*R_inv*h);
        end
%         sign_MVDR = sign_MVDR+1;sign(i)=-1;
    else
        W_f = R_inv*Steer/R_denominator;
%         sign_LCMV = sign_LCMV+1;sign(i)=1;
    end
    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_AESB');
return;