can any one tell me how to make every 1 subcarrier take 2 user ?

N=128; % number of subcarriers

K=4; % number of users

SINR = 20; % SINR in dB (average)

% SINR = 10 log10(Signal power / Noise power)

% sigma squared = sigma2 = (Noise power / Signal Power)

% SINR = 10 log10(1 / sigma2) = -10 log10(sigma2)

sigma2 = 10^(-SINR/10);

channel_gain = rand(N,K)*2;

g = channel_gain;

a = zeros(N,K);

subcarrier_allocation = zeros(128,1);

% Initialize allocation

% Assume only 1 user can have every subcarrier

for count = 1:128

[Max_g,user] = max(g(count,:));

subcarrier_allocation(count) = user;

a(count, user) = 1;

end

Ptotal = 1;

[rate_user, power_user] = waterfilling(1,a,g,Ptotal,N);

utility(1) = sum(rate_user);

Answer 1

[Sufiyan]

Hi,

You can refer to the code below

N=128;  % number of subcarriers
K=4;    % number of users
SINR = 20;  % SINR in dB (average)
sigma2 = 10^(-SINR/10);
channel_gain = rand(N,K)*2;
g = channel_gain;
a = zeros(N,K);
subcarrier_allocation = zeros(128,1);
% Initialize allocation
% Assume only 1 user can have every subcarrier
for count = 1:2:N
    [Max_g,user] = max(g(count,:));
    subcarrier_allocation(count) = user;
    a(count, user) = 1;

    % Assign the next user to the same subcarrier
    [Max_g,user] = max(g(count+1,:));
    subcarrier_allocation(count+1) = user;
    a(count+1, user) = 1;
end
Ptotal = 1;
[rate_user, power_user] = waterfilling(1,a,g,Ptotal,N);
utility(1) = sum(rate_user);