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Method for measuring motion speed of mobile station in mobile communication

A technology of motion speed and mobile communication, applied in wireless communication, communication between multiple stations, service based on location information, etc., can solve the problem of inaccurate measurement of Doppler frequency difference, etc., and achieve reliable and extensive methods Application field, the effect of saving hardware cost

Inactive Publication Date: 2004-10-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When receiving signals, the above two frequency differences are mixed together, so that we cannot accurately measure the Doppler frequency difference

Method used

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  • Method for measuring motion speed of mobile station in mobile communication
  • Method for measuring motion speed of mobile station in mobile communication
  • Method for measuring motion speed of mobile station in mobile communication

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Experimental program
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Embodiment Construction

[0047] Next, we will build a communication system for simulation according to the above ideas. When setting the simulation parameters, we choose the aforementioned CLAASIC spectrum as the Doppler model to discuss the problem, and set the current moving speed of the mobile station V = 120 km / h, the electromagnetic wave propagation speed C = 300000000 m / s, the transmission The carrier frequency is F=2G Hz, it can be seen that λ=C / F=0.15 meters. The difference between the carrier wave transmitted by the transmitter and the output frequency of the local oscillator of the receiver is set to 200 Hz and 100 Hz. The simulation is carried out according to the above parameter configuration.

[0048] Figure 8 It is simulated under the condition of frequency difference of 200 Hz, Figure 9 It is simulated under the condition of frequency difference of 100 Hz. These two graphs are compatible with the idealized Image 6 , Figure 7 Basically the same. Figure 8 , Figure 9 Realisti...

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Abstract

The invention discloses the method for measuring the motion velocity of the mobile station. With the spatial electromagnetic wave being through antenna, process of the radio frequency anjd medium frequency, demodulation and (or) the de-spread, the received signal is analyzed by the method of the power frequency spectrum analysis, such as FFT or wavelet analytical method so as to obtain the frequency spectrum of the signal. The frequency difference between the output frequency of the local oscillator of the carrier wave transmitted by the transmitter and the output frequency of the local oscillator of the receiver is recognized. Thus, the maximum Doppler frequency is obtained so as to calculate out the motion velocity of the mobile station.

Description

technical field [0001] The present invention is mainly applied in the field of mobile communication, and it is mainly applied in the field of mobile communication. Background technique [0002] As we all know, wireless channels include multipath propagation of radio waves, delay spread, fading characteristics and Doppler effect. In mobile communication, we must fully consider these characteristics and solutions. Due to the difference between the carrier wave transmitted by the transmitter and the output frequency of the local oscillator of the receiver, it is difficult to accurately measure the Doppler frequency caused by the movement of the mobile station. [0003] In mobile communication, the moving speed of the mobile station affects the receiving performance of the system. If the moving speed of the mobile station can be accurately estimated, the system structure and performance will be greatly improved. At the same time, with the advent of the third-generation mobile c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/08H04B7/26H04B17/00H04W4/02H04W64/00
Inventor 唐友喜李少谦韩玮兰岚潘春锦孙博
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA