antenna selection and transmit power sharing in matlab

main.m
% Parameters
num_antennas = 4;
channel_gains = rand(1, num_antennas); % Example channel gains
noise_power = 1; % Example noise power

% Initialization
transmit_powers = ones(1, num_antennas); % Initialize transmit powers
antenna_selection = ones(1, num_antennas); % Select all antennas initially

% Main loop
max_iter = 100;
for iter = 1:max_iter
    % Calculate achievable rate for all combinations
    rates = zeros(2^num_antennas, 1);
    for i = 1:2^num_antennas
       combination = de2bi(i-1, num_antennas);
       rate = sum(combination .* channel_gains) / (sum(combination .* transmit_powers) + noise_power);
       rates(i) = rate;
    end
    
    % Select the best combination
    [max_rate, idx] = max(rates);
    best_combination = de2bi(idx-1, num_antennas);
    
    % Update transmit powers and antenna selection
    transmit_powers = best_combination;
    antenna_selection = best_combination;
    
    if iter > 1 && isequal(transmit_powers, old_transmit_powers)
        break; % Convergence reached
    end
    
    old_transmit_powers = transmit_powers;
end
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