Design Method of Mobile Station Positioning Based on Alamouti Code

A design method and technology for mobile stations, applied in the directions of digital transmission systems, error prevention, electrical components, etc., can solve the problems of multipath fading of downlink signals, and that the bit error rate cannot be compensated and corrected, so as to reduce the bit error rate. , optimize system performance, improve the effect of cross-correlation characteristics

Active Publication Date: 2019-04-02
NANJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

[0003] Due to the serious multipath fading of the downlink signal of the LTE system, the traditional transmission of positioning reference messages adopts the one-send-one-receive (SISO) mode, and the transmission reliability of a signal symbol in the channel depends entirely on the channel itself. BER cannot be compensated and corrected

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  • Design Method of Mobile Station Positioning Based on Alamouti Code
  • Design Method of Mobile Station Positioning Based on Alamouti Code
  • Design Method of Mobile Station Positioning Based on Alamouti Code

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Embodiment Construction

[0022] 1. Traditional TOA TDOA positioning method

[0023] (1) TOA positioning technology

[0024] TOA positioning technology is also called circular positioning technology, such as figure 1 , if the distance Ri between the object to be positioned and the i-th base station is already known, then the object to be positioned must be on the positioning circle with the base station as the center and the measured distance Ri as the radius. When the number of base stations is M (M>=3), the M positioning circles must intersect at one point, and the intersection point is the position of the object to be positioned.

[0025] Assume that the location coordinates of the i-th base station are (x i ,y i ), the position coordinates of the object to be positioned are (x, y), then the distance from the object to be positioned to the base station satisfies the following relationship:

[0026]

[0027] In the actual wireless positioning system, the distance from the base station to the o...

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Abstract

The invention discloses a mobile station positioning design method based on Alamouti coding. The method comprises a step 1 that a sending end generates an OFDM positioning reference sequence; a step 2 that the sending end performs double-transmission single-reception Alamouti space-time coding on the generated sequence and then sends the sequence by double antennas; a step 3 that a receiving end receives two signals by a single antenna and integrates the received two signals; a step 4 that the receiving end performs maximum likelihood decoding on an integrated message in order to obtain a time-delayed positioning reference message; a step 5 that the receiving end performs cross-correlation operation to extract a time delay parameter; and a step 6 that the receiving end completes positioning by means of a Chan algorithm. The method reduces the signal reception error rate of the receiving end, improves a signal cross correlation characteristic, and optimizes wireless positioning system performance under a low signal-to-noise ratio.

Description

technical field [0001] The invention relates to a design method for positioning a mobile station based on Alamouti coding, and belongs to the technical field of wireless communication. Background technique [0002] With the vigorous development of wireless communication services, there are more and more mobile station location-based services (LBS), and the accuracy of wireless positioning determines the quality of LBS. For TDOA and TOA positioning methods, the accuracy of wireless positioning is mainly affected by the accuracy of time delay estimation. Therefore, the current research on wireless positioning technology mostly focuses on improving the accuracy of time delay estimation. At present, there are positioning methods based on rough time delay estimation based on increasing sampling speed, fine time delay estimation based on improving sampling accuracy, and obtaining first arrival path based on signal-to-noise ratio threshold. [0003] Due to the severe multipath fad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W64/00H04L1/06H04L1/00
CPCH04L1/0054H04L1/0618H04W64/006
Inventor 黄康解培中
Owner NANJING UNIV OF POSTS & TELECOMM
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