Throughput performance of OFDMA

Question

Prabha Kumaresan 2017-12-5

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/371195-throughput-performance-of-ofdma

评论： Walter Roberson 2019-2-3

for the below mentioned code i want to plot the number of subcarriers in x axis and throughput on yaxis.but for me its showing the number of users in x axis.can anyone help me to solve this issue.

Bmax=2000000; 
noise=1e-9; 
p_fix=0.01;
N_UE=[ 10 20 30 40 50];
N_SC=[ 60 70 80 90 100];
for r = 1:length(N_SC)
for t= 1 :length(N_UE)
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;
     ratio=0.1; 
    c=2*pi*ratio;
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);
[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);
 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
siz = size(G);
        idx = sub2ind(siz, randi([1,N_UE(t)], 1, siz(2)), 1:siz(2));
        C = zeros(siz);
        C(idx) = G(idx)
    throughput =((Bmax.*log(1+((p_fix).*C))./noise));
        overall_throughput = sum(sum((Bmax.*log(1+((p_fix).*C))./noise)));
        output(r,t)=overall_throughput;
         figure
          plot(throughput,'b','linewidth',2);
          legend(['No.of users=' num2str(N_UE(t))])
          xlabel('No of subcarriers')
          ylabel('throughput')
          axis square
          grid on
      end
  end
  figure
  plot(output(:,1), 'color', 'r' ,'linewidth',2);hold on
  plot(output(:,2), 'color', 'b' ,'linewidth',2);hold on
  plot(output(:,3), 'color', 'm' ,'linewidth',2);hold on
  plot(output(:,4), 'color', 'y' ,'linewidth',2);hold on
  plot(output(:,5), 'color', 'g' ,'linewidth',2);hold on
xlabel('No of subcarriers [x10]')
ylabel('Overall Throughput')
legend( 'UE1','UE2','UE3','UE4','UE5','Location','best')
grid on
title('Overall throughput performance')

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Answer 1

Krishan Srimal 2018-1-29

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/371195-throughput-performance-of-ofdma#answer_302241

This is gives me an error. what would be the reason pls?

Attempt to execute SCRIPT throughput as a function: C:\Users\user\Documents\throughput.m

Error in throughput (line 4) plot(throughput,'b','linewidth',2);

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Ubaid Ullah 2019-2-3

Undefined function or variable F

Error in example (line 48)

G(j,k)=(F(j,k)*Lshadow(j))/dist2(j).^Lexp(j);

Walter Roberson 2019-2-3

Ubaid Ullah you are correct, that code does not define F or initialize F, or document what the purpose of F is. The author of the code has not posted anything for about 6 months, so I do not know if they will return to clarify it.

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