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Method and device for carrying out Doppler estimation in high-speed mobile system

A technology of Doppler estimation and high-speed movement, applied in the direction of multi-frequency code system, baseband system components, etc., can solve the problem of negligible movement of user equipment, save transmission power and battery life, increase samples, and improve accuracy Effect

Active Publication Date: 2016-02-17
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

Although the user equipment can move in the carriage of the train, however, considering the speed of the train, the movement of the user equipment can be ignored

Method used

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  • Method and device for carrying out Doppler estimation in high-speed mobile system
  • Method and device for carrying out Doppler estimation in high-speed mobile system
  • Method and device for carrying out Doppler estimation in high-speed mobile system

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Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0054] Figure 4 A flow chart of a method for Doppler estimation in a high-speed mobile system according to one aspect of the present invention is shown.

[0055] In step S401, the apparatus 1 performs channel estimation on the signals of the plurality of user equipments respectively according to the received signals received from the plurality of user equipments, so as to obtain channel estimation values ​​of the plurality of user equipments respectively. In step S402, the device 1 jointly performs Doppler estimation on the plurality of user equipments based on the channel estimation value and based on a normalized post / preprocessing method.

[0056] Here, the device 1 may be located in an eNB, for example. In the following description, eNB is sometimes taken as an example for simplicity.

[0057] It is assumed that the frequency shift is the same for all...

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Abstract

The objective of the invention lies in providing a method and device for carrying out Doppler estimation in a high-speed mobile system, especially an LTE system or other systems based on the OFDM. Compared with the prior art, the method comprises the steps: respectively carrying out the channel estimation of signals of a plurality of pieces of equipment according to receiving signals from the plurality of pieces of equipment, so as to obtain channel estimation values of the plurality of pieces of equipment; and jointly carrying out the Doppler estimation of the plurality of pieces of equipment based on a normalized post-processing / pre-processing method according to the channel estimation values. The method greatly enlarges a training signal sample, and can improve the accuracy of parameter estimation through a classical theory. Meanwhile, the method meets the demands for a shorter period. A combined Doppler estimation algorithm can improve the performance of the high-speed mobile system, and has no loss. The method can increase the number of pieces of access UE of one cell. The method saves the transmission power of a single piece of user equipment, and prolongs the service life of the user equipment.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a technique for performing Doppler estimation in a high-speed mobile system. Background technique [0002] A single UE (User Equipment, user equipment) Doppler estimation method is used to obtain the frequency shift caused by the UE's movement. [0003] In existing systems, a training signal is used to estimate a fixed or variable period. For an example of a fixed period, the channel parameter h of the nth sample at time m m (n), n=0,1,...,N-1; m=0,1,...,M-1, can be estimated by a channel estimation algorithm. If the time interval of the training signal is less than the channel coherence time, h m+1 (n) and h m The phase difference between (n) can be used for frequency shift estimation Frequency shift can be defined as: [0004] [0005] in,[] * is the conjugate operation of the complex number, arg() is the phase angle of the complex number, is the frequency sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 吴涛李剑飞
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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