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Apparatus and method for estimating wireless terminal velocity

A speed and speed mode technology, applied in measurement devices, selection devices, wireless communications, etc., can solve the problems of low computing speed, no fast and effective method for estimating the moving speed of wireless terminals, etc. Channel estimation effect, effect of reducing memory space requirements

Active Publication Date: 2008-08-27
VIA TECH INC
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Problems solved by technology

[0005] However, in the existing digital wireless communication systems, there is no fast and effective method for estimating the mobile speed of the wireless terminal, or it is realized by sacrificing memory space or using high-complexity calculations.
For example, one of the methods is to correlate the channel estimation values ​​of a certain length of sampling points of all pilots to obtain an estimation value of the mobile speed of the wireless terminal. This method has a low calculation speed and requires more memory to store these pilot value

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  • Apparatus and method for estimating wireless terminal velocity
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  • Apparatus and method for estimating wireless terminal velocity

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Embodiment Construction

[0024] In order to make the above-mentioned and other objects, features, and advantages of the present invention more clearly understood, the preferred embodiments are listed below, and in conjunction with the accompanying drawings, the detailed description is as follows:

[0025] figure 1 It is a schematic diagram of an OFDM system receiver including a speed estimation device. The OFDM receiver 100 includes a signal receiving device 102 , a speed estimating device 104 and a channel estimating device 106 . After receiving the wireless signal, the signal receiving device 102 converts the received radio frequency analog signal into a digital signal and performs filtering to reduce noise and interference signals. In one embodiment, the signal receiving device 102 can perform automatic frequency control on the converted digital signal, and further adjust the frequency of the received signal through Fourier transform, signal capture, loop filtering, offset compensation and other d...

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Abstract

The invention provides a method and a device for estimating the velocity of a wireless terminal. The velocity estimating device used in an orthogonal frequency division multiplexing system is used for receiving a plurality of pieces of channel responding information of the orthogonal frequency division multiplexing element, and the velocity estimating result is obtained according to the sampling interval. The device comprises a correlation device used for relevant operation of a plurality of pieces of channel responding information corresponding to the sub-carrier wave with the time field interval being the sampling interval, to obtain a plurality of pieces of relevant result information; a statistical module connected with the correlation device and used for statistical operation of a plurality of pieces of relevant result information, to obtain the relevant result statistical information; a comparator which is connected with the statistical module, compares the relevant result statistical information with the threshold value according to a first threshold value of the comparator, to obtain the velocity estimating result. The velocity estimating device and method applied in the invention can greatly reduce the space demand on the storing device in the estimating value process and greatly enhance the operating speed.

Description

technical field [0001] The present invention relates to an orthogonal multi-carrier transmission system, in particular to a device and method for wireless terminal speed estimation in the orthogonal multi-carrier communication system. Background technique [0002] In digital communication wireless systems for transmitting information such as voice and video, orthogonal frequency division multiplexing (OFDM, orthogonal frequency division multiplex) has been widely used, such as digital audio broadcasting (digital audio broadcasting, DAB) system, terrestrial / Handheld digital video broadcasting systems (DVB-T / H, Digital Video Broadcast-Hand-held / Terrestrial), etc., are used for frequency-selective fading wireless channels. [0003] In these wireless communication systems, one of the core technologies is the data reception of the wireless terminal when it is moving, especially at high speed. Due to changes in vehicle speed or terminal moving speed, it will be affected by freque...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/34H04Q7/38H04B7/26H04W64/00
CPCG01S11/02H04W64/006G01S5/0278
Inventor 王伟平
Owner VIA TECH INC
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