Could anyone help me to overcome the error

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Prabha Kumaresan
Prabha Kumaresan 2017-12-22
clear all
clc
%-----Simulation Parameters-----%
Bmax=2000000; %maximum available bandwidth for OFDMA
noise=1e-9; %fixed noise power is assumed
p_fix=0.01; %fixed transmit power is assumed
N_UE=[2 4 6 8 10];
N_SC=[12 14 16 18 20];
for it=1:2
for t= 1:length(N_UE)
%-----Topology-----%
Xmax=1; % x-coordinate for base station
Ymax=1; % y-coordinate for base station
radius=5; %coverage radius
xsd=ones(1,N_UE(t))*Xmax;
ysd=ones(1,N_UE(t))*Ymax;
rrx=radius*sqrt(rand(1,N_UE(t)));
thetarx=2*pi*rand(1,N_UE(t));
ang=0:0.01:2*pi;
xrx=xsd+rrx.*cos(thetarx); %random position of receivers-->x-coordinate
yrx=ysd+rrx.*sin(thetarx); %random position of receivers-->x-coordinate
th = 0:pi/100:2*pi;
xunit = radius * cos(th) + Xmax;
yunit = radius * sin(th) + Ymax;
% figure
% plot(xunit, yunit);
% hold on
% plot(ysd,xsd,'r^')
% hold on
% plot(yrx,xrx,'ko')
% hold on
%-----Subcarrier Correlation Matrix-----%
ratio=0.1; %Td over Tb: delay spread relative to OFDM frame duration
c=2*pi*ratio;
for r = 1:length(N_SC)
for j=1:N_UE(t)
temp=[];
for n=1:N_SC(r)
nc=(n-1)*c;
entry=(1+i*nc)/(1+nc^2);
temp=[temp entry];
end
Rchan=toeplitz(temp);
%autocorrelation matrix
[E,L]=eig(Rchan);
SQRTL=sqrt(L);
A=E*SQRTL/sqrt(2);
GG=randn(N_SC(r), 1)+i*randn(N_SC(r),1);
H=A*GG;
HH=abs(H);
% figure
% plot(abs(H))
% hold on
for k=1:N_SC(r)
F(j,k)=HH(k);
end
end
%-----Subcarrier Gain-----%
as=4;
bs=10;
Lsigma=as+(bs-as)*rand(1,N_UE(t));
Lshadow=10.^(randn(1,N_UE(t)).*(Lsigma/10));
ae=3;
be=5;
Lexp=ae+(be-ae)*rand(1,N_UE(t));
for k=1:N_SC(r)
for j=1:N_UE(t)
dist2(j)=sqrt((xrx(j)-xsd(j))^2+(yrx(j)-ysd(j))^2);
G(j,k)=(F(j,k)*Lshadow(j))/dist2(j).^Lexp(j);
end
end
%subcarrier allocation to users%
siz = size(G);
idx = sub2ind(siz, randi([1,N_UE(t)], 1, siz(2)), 1:siz(2));
C = zeros(siz);
C(idx) = G(idx);
D=sum(C,2);
% Throughput performance %
throughput =((Bmax.*log(1+((p_fix).*C))./noise));
overall_throughput = sum(sum(throughput));
output(t,r)=overall_throughput;
output_it(t,r,it)=output(t,r);
% figure
% plot(overall_throughput,'b','linewidth',2);
% legend(['No.of subcarriers=' num2str(N_SC(r))])
% xlabel('No of users')
% ylabel('overall_throughput')
% axis square
% grid on
end
end
end
out = sum(output_it,3);
final = out./2;
%Group formation%
N_G=5;%No of group
B = cell(N_G,1);
sumB = cell(N_G,1);
for d=1:1:N_G
if d==1
e=randi([2 5],1)% select No of UE randomly
else
sz=length(C(:,1));
e=randi([1 sz],1)% select No of UE randomly
end
idx=randsample(1:size(C,1),e)
B{d} = C(idx,:)
C(idx,:) = []
[rows, columns] = size(B{d});
% Get sum of columns and replicate vertically.
sumB{d} = repmat(sum(B{d},1), [rows, 1])
end
E=[sumB{1}; sumB{2};sumB{3};sumB{4};sumB{5}]
If i run this code i am getting Error using randi First input must be a positive scalar integer value IMAX, or two integer values [IMIN IMAX] with IMIN less than or equal to IMAX.
Error in model (line 113) e=randi([1 sz],1)% select No of UE randomly.
could anyone help me to overcome this error.

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