## Abbreviations
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Art** & **Year** & **Est** & **AP** & **rPoint** & **fMap** & **fmRoom** & **mAlg** & **sAlg** & **mError** & **oError** & **\(\mathbf{\hat{s}Type}\)** \\ \hline
[106] & 2019 & exp & 4 & 42 & 80 m\({}^{2}\) & N & RBF & LM & 1.42 m & RMSE = 1.459 m & RSSI \\ \hline
[107] & 2019 & exp & \(N/A\) & 300 & 302 m\({}^{2}\) & Y & SVM & 4.6 m & & RSSI \\ \hline
[60] & 2019 & exp & 5 & 10 & NULL & N & RF & & Accuracy = 97.5\% in 2 m & RSSI \\ \hline
[108] & 2019 & exp & 8 & 107 & 512 m\({}^{2}\) & Y & K-ELM & & RMSE = 1.7123 m std = 2.418 m & RSSI \\ \hline
[109] & 2019 & exp & 9 & 96 & 560 m\({}^{2}\) & Y & QKMMCC & & average = 0.76m & RSSI \\ \hline
[65] & 2019 & exp & 520 & 993 & UJIndoorLoc & Y & RNN & & Accuracy = 87.41\%floor std = 0.83 m & RSSI \\ \hline
[83] & 2019 & exp & 7 & \(N/A\) & 4 Rooms & Y & RNN & & Accuracy = 95.8\% std = 0.60 m & RSSI \\ \hline
[83] & 2019 & exp & 520 & 993 & UJIndoorLoc & Y & RNN & 4.2 m & std = 3.2 m & RSSI \\ \hline
[110] & 2019 & exp & 6 & 365 & 336 m\({}^{2}\) & Y & RNN & 0.75 m & std = 0.64 m & RSSI \\ \hline
[110] & 2019 & exp & 9 & 261 & 300 m\({}^{2}\) & N & BPNN & 2.7 m & Accuracy = 90\% & RSSI \\ \hline
[111] & 2019 & exp & 8 & 66 & 736 m\({}^{2}\) & Y & SDA & 3.7 m & Accuracy = 84\% & RSSI \\ \hline
[112] & 2019 & exp & 1 & 42 & 50 m\({}^{2}\) & N & CNN & 0.46 m & without obstacles & RSSI \\ \hline  & & exp & 1 & 42 & 50 m\({}^{2}\) & N & CNN & 1.11 m & with some obstacles & RSSI \\ \hline  & & exp & 1 & 15 & 20 m\({}^{2}\) & Y & MLP & 1.42 m & & RSSI \\ \hline
[113] & 2019 & exp & 1 & 15 & 20 m\({}^{2}\) & Y & CNN & 1.67 m & & RSSI \\ \hline  & & exp & 1 & 15 & 14.4 m\({}^{2}\) & N & MLP & 1.43 m & & RSSI \\ \hline  & & exp & 1 & 15 & 14.4 m\({}^{2}\) & N & CNN & 1.51 m & & RSSI \\ \hline
[114] & 2019 & exp & 258 & 9 & 125 m\({}^{2}\) & Y & CNN & 3.91 m & Accuracy = 84\% & RSSI \\ \hline
[63] & 2019 & pMap & \(N/A\) & \(N/A\) & NULL & Y & BPNN & ACO & Accuracy = 91.4\% & RSSI \\ \hline
[115] & 2019 & pMap & 520 & 993 & UJI Library & Y & CNN, GRP & & 3.6 m & 90\% less 2m & RSSI \\ \hline
[42] & 2019 & exp & 1 & 25 & 26.4 m\({}^{2}\) & N & BPNN & PCA-PD & 1.42 m & std = 1.1511 m & CSI \\ \hline  & & exp & \(N/A\) & 20 & 1200 m\({}^{2}\) & Y & MLP & SDAE & 3.05 m & 1 day & RSSI \\ \hline
[84] & 2019 & exp & \(N/A\) & 57 & 2400 m\({}^{2}\) & Y & MLP & SDAE & 3.39 m & 2 days & RSSI \\ \hline  & & pMap & 520 & 993 & UJIndoorLoc & Y & MLP & SDAE & 5.64 m & 10 days & RSSI \\ \hline
[116] & 2019 & pMap & 520 & 993 & UJIndoorLoc & Y & VAE & & & RMSE = 4.65 m & RSSI \\ \hline  & & exp & 6 & 49 & 1600 m\({}^{2}\) & Y & DNN & & 0.95 m & Open Doors & RSSI \\ \hline  & & exp & 6 & 49 & 1600 m\({}^{2}\) & Y & DNN & & 1.26 m & Closed Doors & RSSI \\ \hline  & & exp & 4 & 228 & 1200 m\({}^{2}\) & Y & ANN & & 1.22 m & RSSI \\ \hline  & & exp & \(N/A\) & \(N/A\) & \(N/A\) & Y & ANN & & 1.90 m & RSSI \\ \hline
[119] & 2019 & exp & 7 & 25 & 1728 m\({}^{2}\) & N & RNN & LSTM & 1.05 m & std = 0.8856 m & RSSI \\ \hline
[120] & 2019 & exp & 15 & 71 & 4000 m\({}^{2}\) & Y & NN & GA & 3.47 m & RSSI \\ \hline
[121] & 2019 & exp & 4 & 50 & 1100 m\({}^{2}\) & Y & BGM & & 2.9 m & RSSI \\ \hline
[122] & 2019 & exp & 122 & 48 & 629 m\({}^{2}\) & Y & DNN & & 2.64 m & RSSI \\ \hline  & & exp & 59 & 139 & 65 m\({}^{2}\) & N & DNN & & 1.21 m & RSSI \\ \hline
[123] & 2018 & pMap & 520 & 993 & UJIndoorLoc & Y & CNN & & 95.76\% floor level & RSSI \\ \hline
[124] & 2018 & pMap & 7 & 1000 & Rajen Bhatt & Y & RF & & 98.3\% floor level & RSSI \\ \hline
[125] & 2018 & exp & 20 & 2100 & 8250 m\({}^{2}\) & Y & DNN & 3.95 m & std = 2.72 m & RSSI \\ \hline
[126] & 2018 & exp & 16 & 202 & 806 m\({}^{2}\) & Y & SMN & PCA & 1.85 m & std = 1.04 m & RSSI \\ \hline
[127] & 2018 & pMap & 520 & 993 & UJIndoorLoc & Y & DQN & & 78.79\% in 1 m & RSSI \\ \hline
[37] & 2018 & exp & 50 & 180 & 75 m\({}^{2}\) & Y & RF & 1.29 m & 90\% in 3 m & RSSI \\ \hline
[128] & 2018 & exp & \(N/A\) & \(N/A\) & NULL & Y & DNN & 83.6\% floor with people, 99.6\% without RSSI \\ \hline  & & & & & & & & & \\ \hline \hline \end{tabular}
\end{table}