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SRL_KNN_Histogram_main.m
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SRL_KNN_Histogram_main.m
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Wifi Indoor Localization
% Minhtu
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% K-Nearest_Neighbour
% Euclidean Distance
% D = sqrt((ss-ss1)^2+(ss-ss1)^2+...)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Database: Histogram
% X Y Z MAC1 Mean_RSSI1 MAC2 Mean_RSSI2 ...
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clear;
close all;
clc;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Parameter - 1 Unit = 40 inches
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
K = 5;
Num_Mac = 11; % Number of APs per vector in database
NumProbRSSI = 10; % Number of Histogram data for each point
% Load Database
myFolder = 'C:\Users\minh_\Desktop\CSI_RSSI_Database\RSSI_6AP_Experiments\Nexus4_Data\'; % Database Folder
Input = importdata([myFolder 'Histogram_24Jan2018_10_11MAC.csv']);
Database = Input;
% Test
InputTest = importdata([myFolder 'Long_Traj_172Locations_RSSI.csv']);
TestPoint = InputTest;
NumTestingPoint = length(TestPoint); % Number of Test points
% History Buffer Option
IdealFlag = 0; % 1: Using Ideal History
% 0: Using Real History
IdealHistory_Array = TestPoint(:,1:2);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Init
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Starting Position
Starting_Position = TestPoint(1,1:2);
% Assumption
v_user_max = 2; % m/s
t_request = 1; % Period of request time is 5 seconds
distance_max = v_user_max*t_request; % meters
sigma = 2*distance_max; % 1 Unit = 40 inches
Cluster_Max_Distance = 5*distance_max; % Maximum of Possible distance
Cluster_Min_Distance = 0;
% Estimated Location Buffer
Estimated_Position = zeros(NumTestingPoint,2);
Distance_Error_Meters = zeros(1,NumTestingPoint);
% History Buffer
% Num_Buff_His = 2;
History = Starting_Position;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Loop to find the location
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
for CountPoint = 1:NumTestingPoint
% for CountPoint = NumTestingPoint:-1:1
% RSSI of the current point
Mean_Current_RSSI = TestPoint(CountPoint,3:end);
Core_Weight_Point = History; % Most Recent Previous Point
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Step 1: Clustering (Choose Possible Zone)
% Input:
% - Database: X Y Z MAC1 Mean_RSSI1 MAC2 Mean_RSSI2 MAC3 Mean_RSSI3
% - Mean_Current_RSSI
% Output: Cluster includes the vectors which have RSSI values are nearest to Mean_Current_RSSI
% - Cluster_Array: X Y Z MAC1 Mean_RSSI1 MAC2 Mean_RSSI2 MAC3 Mean_RSSI3
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
NumCol_Cluster = 2 + Num_Mac*2;
Size_Database = size(Database);
Length_Database = Size_Database(1);
NumRow_Cluster = round(Length_Database/3);
Cluster_Vector = zeros(NumRow_Cluster,NumCol_Cluster);
% Possible Zone
Pos_Array = NearDistanceNeighbour(Core_Weight_Point, Database, Length_Database, Cluster_Min_Distance, Cluster_Max_Distance);
Length_Cluster = length(Pos_Array);
for ii=1:Length_Cluster
Cluster_Vector(ii,:) = Database(Pos_Array(ii),:);
end
Cluster_Vector = Cluster_Vector(1:Length_Cluster,:);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Step 2: Locate Position - Using Gaussian Weight
% Input :
% - Mean_Current_RSSI : Array of Mean RSSI for each APs
% - Cluster_Array: X Y Z MAC1 Mean_RSSI1 MAC2 Mean_RSSI2 ...
% - Num_Mac (Number of APs in each vector)
% - Value of K (1,2,3)
% Output:
% X Y Z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% KNN without Prediction
EstPosition = SRL_KNN_Histogram(Core_Weight_Point, sigma, Mean_Current_RSSI, ...
Cluster_Vector,Length_Cluster, Num_Mac,NumProbRSSI,K);
Estimated_Position(CountPoint,:) = EstPosition;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Update History
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if IdealFlag == 0 % Real History
History = EstPosition; % Update recent point
else
History = IdealHistory_Array(CountPoint,:); % Update recent point
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Distance Error
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
True_Position = [TestPoint(CountPoint,1) TestPoint(CountPoint,2)];
Distance_Error = (EstPosition(1)-True_Position(1))^2+(EstPosition(2)-True_Position(2))^2;
Distance_Error_Meters(CountPoint) = sqrt(Distance_Error);
end
Average_Error = sum(Distance_Error_Meters)/length(Distance_Error_Meters)
% Variance Calculation
Var_Dis_Error = 0;
for jj=1:length(Distance_Error_Meters)
Var_Dis_Error = Var_Dis_Error + (Distance_Error_Meters(jj)-Average_Error)^2;
end
Var_Dis_Error = Var_Dis_Error/length(Distance_Error_Meters);
Std_Dis_Error = sqrt(Var_Dis_Error)
% CDF
Theshold_Array = 0:0.5:max(Distance_Error_Meters)+1;
CDF_Array = zeros(1,length(Theshold_Array));
for ii= 1:length(Theshold_Array)
Count_CDF = 0;
for jj=1:length(Distance_Error_Meters)
if Distance_Error_Meters(jj) <= Theshold_Array(ii)
Count_CDF = Count_CDF + 1;
end
end
CDF_Array(ii) = Count_CDF/length(Distance_Error_Meters);
end
figure,plot(Theshold_Array,CDF_Array);
title('KNN With Mean Fingerprint');
xlabel('Distance Error (meter)');
ylabel('CDF');
% Draw Ground Truth
figure,plot(Database(:,1),Database(:,2),'b*');
hold on;
plot(IdealHistory_Array(:,1),IdealHistory_Array(:,2),'r-');
hold on;
plot(Estimated_Position(:,1),Estimated_Position(:,2),'k-');
legend('RP','Ground Truth','Predicted Trajectory');