Laser & Optoelectronics Progress, Volume. 58, Issue 8, 0812001(2021)
Research on Fingerprint Location Algorithm Based on OCAE-SOM
Figures & Tables(11)
Fig. 6. Comparison of positioning accuracy of four indoor positioning algorithms in different environments. (a) NLOS layout; (b) LOS layout
Table 1. Network structure of CAE
View tableTable 1. Network structure of CAE
Layer Parameter Activation function Output size Convolutional layer 3×3 filter kernel 16 feature images ReLU 64×64×16 Max pooling layer 2×2 -- 32×32×16 Convolutional layer 3×3 filter kernel 8 feature images ReLU 32×32×8 Max pooling layer 2×2 -- 16×16×8 Convolutional layer 3×3 filter kernel 8 feature images ReLU 16×16×8 Max pooling layer 2×2 -- 8×8×8
Table 2. Parameter setting of Adam algorithm
View tableTable 2. Parameter setting of Adam algorithm
Parameter Meaning Value α Learning rate 0.01 β1 Exponential decay rate of 1st moment estimate 0.9 β2 Exponential decay rate of 2nd moment estimate 0.999 ε Constant 1×10-8
Table 3. Comparison of location accuracy of feature extraction methods
View tableTable 3. Comparison of location accuracy of feature extraction methods
Method Environment Maximum positioning error /m Average positioning error /m Training time /s CAE LOS 4.5382 1.2725 3.41 NLOS 7.9603 1.9341 6.32 PCA LOS 6.0362 1.7260 7.29 NLOS 9.5374 2.3071 12.53 Statistical average LOS 6.5607 1.9564 9.72 NLOS 10.6243 3.0472 16.74
Table 4. Performance comparison of proposed algorithm before and after improvement
View tableTable 4. Performance comparison of proposed algorithm before and after improvement
Algorithm Probability distributions /% Training time /s Accumulate within 1 m Accumulate within 2 m CAE-SOM 62.71 85.36 10.42 OCAE-SOM 70.54 96.11 1.86
Table 5. Average location response time of different algorithms
View tableTable 5. Average location response time of different algorithms
Algorithm CSI-improved WKNN smoothing+SVM CSI-XGBoost OCAE-SOM Average location response time /ms 10.249 8.935 8.027 6.914
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Xinchun Li, Xiaolu Ji, Wu Wei, Liyan Wang, Yongyan Gu, Dayan Cao. Research on Fingerprint Location Algorithm Based on OCAE-SOM[J]. Laser & Optoelectronics Progress, 2021, 58(8): 0812001
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: Aug. 4, 2020
Accepted: Sep. 9, 2020
Published Online: Apr. 16, 2021
The Author Email: Xiaolu Ji (3078929795@qq.com)
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