Can anyone help me verify the code for maximal ratio combining for 3 receivers

[Sneha Reddy]

clc;
clear all;
close all;
nr=3;ns=10;
M=2;Es=10;
k=log2(M);
SNR=[4:4:20];
for i=1:length(SNR)
count=0;
msg_symbol=randint(ns,1);
b=length(msg_symbol);
N=length(msg_symbol)/k;
l=reshape(msg_symbol,N,k);
xsym=bi2de(l,'left-msb');%binary to decimal conversion(symbol converison)
x=pskmod(xsym,M);
N0=((4*Es)/10^(SNR(i)/10));
h = randn(ns,nr)+1j*randn(ns,nr);%
Z =sqrt(N0/2)*(randn(ns,nr)+i*randn(ns,nr));

y1,1)=(x.*h,1))+Z,1);
y1,2)=(x.*h,2))+Z,2);
y1,3)=(x.*h,3))+Z,3);

w,1)=(h,1))/norm(h);
w,2)=(h,2))/norm(h);
w,3)=(h,3))/norm(h);

yf1=w'.*transpose(y1);
y=sum(yf1);
k1=pskdemod(y,M);%PSK demodulation
rec_bits=de2bi(k1,'left-msb',k);% symbol to bit mapping
z1=reshape(rec_bits,(N*k),1);
count=count+sum(abs(msg_symbol-z1));

B_err(i)=count/(ns);
end



semilogy(SNR,B_err);