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Wireless signal Doppler frequency shift method for determining moving object direction reflection

一种多普勒频移、运动物体的技术，应用在无线信号领域，能够解决不包含频移的方向、无法获得多普勒频移信息等问题

Active Publication Date: 2017-09-15
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Doppler frequency shift information estimated in this way only contains the magnitude of the frequency shift, not the direction of the frequency shift (forward / reverse offset), and the complete Doppler frequency shift information cannot be obtained

Method used

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  • Wireless signal Doppler frequency shift method for determining moving object direction reflection
  • Wireless signal Doppler frequency shift method for determining moving object direction reflection
  • Wireless signal Doppler frequency shift method for determining moving object direction reflection

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.

[0046] The present invention provides a method for determining the Doppler frequency shift of a wireless signal directly reflected by a moving object, based on a wireless signal multi-antenna transceiver system and a processing server (processing system), using CSI conjugate multiplication of channel state information on multiple antennas Eliminate the random phase shift caused by the out-of-synchronization of the transceiver equipment. After removing the static path signal components by subtracting the mean value, take the CSI sampling on different subcarriers as a snapshot, and use the Multiple Signal Classification (MUSIC) to obtain Frequency spectrum, and then extract the Doppler frequency shift of the signal directly reflected by the target object.

[0047] In an embodiment of the present invent...

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Abstract

The invention discloses a wireless signal Doppler frequency shift method for determining moving object direct reflection. The wireless signal Doppler frequency shift method can use channel state information on two antennas (namely CSI) to perform conjugate multiplying to eliminate random phase shift caused by non-synchronous wireless transmit-receive devices, and can obtain complete Doppler frequency shift information from the phase information of the channel state information which includes sizes and directions. The wireless signal Doppler frequency shift method for determining moving object direct reflection eliminates interference on the Doppler shift which is caused by frequency information of a static path so as to obtain more accurate frequency estimation. The wireless signal Doppler frequency shift method for determining moving object direct reflection can use multiple signal classification algorithm (MUSIC) to estimate a frequency spectrum according to a practical sampling interval and avoid an effect on the frequency estimation accuracy which is caused by uniform sampling by the practical wireless transmit-receive system.

Description

technical field [0001] The invention relates to the technical field of wireless signals, in particular to a method for determining the Doppler frequency shift of a wireless signal directly reflected by a moving object. Background technique [0002] During the transmission process, the wireless signal not only reaches the receiving end through the direct path between the transceiver devices, but also reaches the receiving end after being reflected by objects in the transmission environment (ground, people, walls, furniture, etc.), which is also called multipath transmission. If the transmitting end, reflector or receiving end of a path signal is constantly moving, there will be an offset between the signal frequency measured at the receiving end and the actual frequency of the signal sent by the transmitting end. This frequency offset is called the path Doppler shift of the signal. When there is a moving object in the transmission space of the wireless signal, the object wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/309H04W4/02
CPCH04B17/309H04W4/027H04W56/0035H04B7/01
Inventor 张大庆李翔
Owner PEKING UNIV
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