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Method and movable repeater for realizing signal reception in high speed moving environment

A high-speed mobile and signal receiving technology, applied in the field of mobile repeater and signal receiving, can solve problems such as switching difficulties, and achieve the effect of eliminating Doppler frequency shift, avoiding multipath effects, and solving frequency difference problems.

Active Publication Date: 2014-09-17
MAIPU COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a signal receiving method in a high-speed mobile environment and a mobile repeater implementing the method, so as to solve the problem of handover difficulties caused by the frequency difference between the front and back cells of the user terminal during the high-speed movement process, thereby improving the success rate of cell handover

Method used

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  • Method and movable repeater for realizing signal reception in high speed moving environment
  • Method and movable repeater for realizing signal reception in high speed moving environment
  • Method and movable repeater for realizing signal reception in high speed moving environment

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Embodiment

[0054] For the convenience of description, some parameters are cited in this embodiment, and these parameters are now classified and described in the following table for subsequent understanding:

[0055] parameter name Parameter Description f 0 For the standard frequency value of the downlink input signal, please refer to the 3GPP protocol standard Df The expression method of Doppler frequency shift in the description is the absolute value of the actual Doppler frequency shift value, which changes dynamically with the change of the moving state f d The Doppler frequency shift value obtained when the monitoring subunit processes data (positive or negative) Offset It is the first threshold value (positive value), which is triggered when the mobile repeater enters the near site of the front cell, and is used to judge whether the mobile repeater needs to change branch selection and signal transmission Openset It is the secon...

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Abstract

The present invention proposes a method for realizing signal reception in a real high-speed mobile environment, comprising the following steps: performing initialization setting: setting the output frequency of the first phase-locked loop and the second phase-locked loop to change symmetrically, and setting the Doppler of the current signal When the frequency shift value is negative, the signal is input to the branch where the first phase-locked loop is located, and when the Doppler frequency shift value of the signal is positive, the signal is input to the branch where the second phase-locked loop is located; Calculate the Doppler frequency shift value of the received cell signal, and distinguish and judge the signal according to the positive and negative Doppler frequency shift value. Output the signal through the corresponding branch. The present invention eliminates the Doppler frequency shift of the received signal by locking the signals of the front and rear cells respectively; solves the frequency difference problem when the front and rear cells are switched; and avoids the multipath effect of the signal.

Description

technical field [0001] The invention mainly relates to the signal receiving technology in the field of mobile communication, in particular to a receiving technology of mobile communication signals in a high-speed mobile environment and a mobile repeater. Background technique [0002] The continuous improvement of the operating speed of vehicles has made people's travel faster and more convenient, but it has also brought new difficulties to the signal reception of mobile communication systems in high-speed mobile environments. The high-speed mobile environment mainly refers to the land high-speed mobile environment, such as high-speed railways, highways and other coverage scenarios. For the coverage of the mobile network, the impact of the speed environment below 150km / h on the network coverage is not obvious, while the speed of the domestic high-speed railway is 250km / h to 400km / h, which is the main coverage area that needs to be solved. In the high-speed mobile environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/01H04B7/15
Inventor 任震宇肖奕黎建
Owner MAIPU COMM TECH CO LTD
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