Method and device for estimating moving velocity of terminal

A technology of moving speed and estimation device, which is applied in transmission monitoring, electrical components, transmission systems, etc., and can solve problems such as inconsistencies in high-speed moving speeds

Inactive Publication Date: 2010-03-31
TD TECH COMM TECH LTD
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Problems solved by technology

For example, if figure 1 As shown, when the terminal in the feature 1 scene moves to the origin O, the Δf obtained by the system in the physical layer channel estimation will be zero, so, according to the formula (2), the terminal moving speed v is zero, which is consistent with the actual The high-speed movement speed does not match

Method used

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  • Method and device for estimating moving velocity of terminal
  • Method and device for estimating moving velocity of terminal
  • Method and device for estimating moving velocity of terminal

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Embodiment Construction

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The main idea of ​​the present invention is to make appropriate changes to the formula (1) by utilizing the characteristic that the mobile speed of the terminal in the feature 1 scene is close to a constant value, and eliminate the parameter θ that the system cannot know, and obtain a calculation formula of the mobile speed of the terminal that has nothing to do with θ , so that the terminal moving speed can be estimated more accurately without ignoring the angle θ. The specific derivation method of the terminal moving speed calculation formula is:

[0024] Deriving formula (1), we get Δf'=f 0 ·(v / c)·sinθ(3);

[0025] According to formula (1), get (Δf) 2 = f 0 2 ·(v / c) 2 ·cos 2 θ(4);

[0026] According to formula (3), get (Δ...

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Abstract

The invention discloses a method and a device for estimating the moving velocity of a terminal. The method comprises the following steps: a, calculating Doppler frequency shift delta(f) and a first derivative delta(f') of the delta(f); and b, utilizing the calculated delta(f) and delta(f') to obtain the moving velocity of the terminal v according to a formula shown on the right. In the formula, cis the velocity of light; and f0 is centre carrier frequency. The method in the invention can accurately estimate the moving velocity of the terminal by utilizing the formula shown on the right.

Description

technical field [0001] The present invention relates to the estimation technology of terminal moving speed in mobile communication system, especially relates to the estimation method of terminal moving speed in high-speed movement. Background technique [0002] In some mobile communication scenarios, the movement of the terminal has the following characteristics: most of the time, the user moves along a predetermined route at a relatively stable high speed (hereinafter referred to as feature 1). The high-speed railway scenario is a typical scenario with feature 1. The emergence of high-speed railways with feature 1 and similar scenarios pose great challenges to mobile communication systems. For example, in the existing handover strategy, because it is aimed at the scene where the terminal is stationary or moving slowly, in the above-mentioned scene, the difference in the moving speed of the terminal has little influence on the performance of the handover, therefore, the exi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00H04B17/00
Inventor 赵春华王伟华
Owner TD TECH COMM TECH LTD
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