60GHz Non-Line-of-Sight identification and wireless fingerprint positioning method based on energy detection
A fingerprint positioning and energy detection technology, which is used in positioning, radio wave measurement systems, measurement devices, etc.
Inactive Publication Date: 2016-07-06
OCEAN UNIV OF CHINA
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The problem becomes how to set an appropriate normalization threshold according to the fingerprint characteristics of the signal. The simplest threshold method is the fixed threshold method, and the threshold is a fixed value. However, in practical applications, the threshold is always changing, so it cannot be applied on a large scale
Next is the normalized threshold method based on kurtosis, although the complexity of this algorithm is reduced, these algorithms are compared with the joint TOA fingerprint estimation algorithm based on gradient, standard deviation and skewness proposed in the present invention, no matter in terms of accuracy There is still a big gap in stability, especially in multipath and non-line-of-sight environments
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[0091] When performing wireless positioning, the terminal to be positioned sends multiple 60GHz pulse sequences regularly according to its settings, so as to facilitate multiple measurements. All positioning base stations that receive the pulse sequence obtain the average joint parameter J2P through energy reception, use K to only identify the NLOS state, and obtain the estimated value of the optimal normalization threshold X according to the pre-trained neural network, so that Finally get the estimated value of TOA; transmit the NLOS identification result and TOA estimation result to the positioning server; then at the positioning server side, according to the NLOS identification result, the measured distance or distance difference and the coordinate position of the reference base station, use the TOA or TDOA positioning algorithm Determine the spatial location of the terminal to be tested. Such as Figure 7 As shown, it mainly includes the following steps:
[0092] (1), sy...
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The invention discloses a 60GHz Non-Line-of-Sight identification and wireless fingerprint positioning method based on energy detection. The method provided by the invention is characterized in that 1) a combined parameter J constituted by skewness, leptokurtosis, maximum curl, and maximum slope of a signal, an optimized normalized threshold X, and a parameter D constituted by maximum curl and maximum slope can be acquired; 2) the fingerprint database between the J and the X can be established; 3) the optimized threshold can be estimated according to the J by adopting the fingerprint database; 4) the Non-Line-of-Sight identification can be carried out by adopting the D; 5) the distance can be calculated by adopting the TOA estimation; 6) the 60GHz wireless positioning can be carried out: the wireless positioning based on the 60GHz signal can be carried out by adopting the conventional positioning algorithm according to the Non-Line-of-Sight identification result and the TOA estimation value. The result shows that 1) the NLOS identification success rate is higher than the Non-Line-of-Sight identification algorithm of the same type; 2) in the Line-of-Sight environment and the Non-Line-of-Sight environment, and in the great signal to noise ratio range, the method provided by the invention has the higher precision and the better robustness by comparing with other methods based on the energy detection.
Description
technical field [0001] The invention belongs to the technical field of wireless positioning, in particular to a 60GHz non-line-of-sight identification and wireless fingerprint positioning method based on energy detection. Background technique [0002] Pulse 60GHz wireless communication technology is a wireless communication technology that uses discrete pulses of hundreds of picoseconds or less for communication without carrier. Compared with the current existing communication systems, 60GHz wireless communication technology has the advantages of high spectrum reusability, strong anti-interference ability, wide available spectrum, large transmission power, large system capacity, high time resolution and multipath resolution. One of the main reasons for widespread attention to 60GHz technology in recent years is because of the huge license-free bandwidth. Compared with the ultra-wideband technology that also uses the license-free frequency band, the 60GHz technology has a co...
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IPC IPC(8): G01S5/06
CPCG01S5/06
Inventor 梁晓林张浩刘兴吕婷婷魏兆强
Owner OCEAN UNIV OF CHINA