How to put control energy and gain in a loop

Hello people! I got a question about constructing a control loop. I've optimized and solved my control problem using standard solver and I got ubar as mean of u and xbar as mean of system states and K as gain and also a system defined by A,B,G,...

xdot = A*x + B*u + G*w

there is no C matrix or D matrix or any info about them. also an affine feedback is assumed there u = K * (x - xbar) + ubar

I wanted to put gain (K) and mean of control signal (ubar) in a loop and give them to system and plot states, but I don't know how to find close loop response.

I've already tried lsim, but there was a bunch of errors about dimension of matrices etc

clc;
clear;
close all;
%% Time structure
dt=1;          
tf = 10;
t = 0:dt:tf-1;
t = t';
%% System structure
A = [1.02  -0.1
     0.1   0.98]; 
B = [0.5 0
    0.05 0.5];
G = [0.3 0
     0 0.3]; 
%%
ubar = 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xbar0 = ones(2,55);

[Ali Esmaeilpour]

it's MPC with N=5 as horizon so I think ubar and K dimension should be reduced and the primary numbers of K and ubar can be selected. and we don't need C because we are working from input to states. and x and u should not have same dimensions.