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Method and device for eliminating frequency offset jump

A sudden jump and frequency offset technology, which is applied to the shaping network and baseband system components in the transmitter/receiver, can solve problems such as inter-user interference, frequency offset jump compensation errors, and reduce system performance at the time of base station switching

Active Publication Date: 2015-07-15
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, when there are multiple users, using common pilots to send frequency offset estimates will cause interference between users, causing serious errors in the compensation of frequency offset jumps, and reducing system performance at the time of base station handover

Method used

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  • Method and device for eliminating frequency offset jump
  • Method and device for eliminating frequency offset jump
  • Method and device for eliminating frequency offset jump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] see figure 1 , an embodiment of the present invention provides a method for eliminating frequency offset jump, including:

[0063] Step 101: Obtain a first estimated frequency offset value for the first time unit by performing frequency offset estimation on symbols output by phase-locked loop tracking within the first time unit;

[0064] Step 102: According to the second frequency offset estimated value of the second time unit and the first frequency offset estimated value of the first time unit, determine whether the frequency offset jump occurs in the symbol output by the phase-locked loop tracking in the first time unit, and the second The time unit is before the first time unit, and the second frequency offset estimation value of the second time unit is an estimated frequency offset value obtained by filtering the symbols output by the phase-locked loop tracking in the second time unit within the second time unit;

[0065] Step 103: If yes, then according to the fi...

Embodiment 2

[0085] An embodiment of the present invention provides a method for eliminating frequency offset jump.

[0086] When the terminal is moving at a high speed, the terminal receives symbols through the phase-locked loop in each time unit, performs tracking processing on the received symbols and outputs the tracking processed symbols; when the terminal switches from one RRU to another RRU, the terminal received The symbol will have a jump in frequency offset. At this time, the phase-locked loop cannot track the frequency change of the symbol when processing the symbol. Therefore, it is necessary to eliminate the impact of the jump in frequency offset on the symbol output by the phase-locked loop.

[0087] In the embodiment of the present invention, the time unit is a symbol length, that is, the phase-locked loop tracking process outputs a symbol in each time unit, and the current time unit is called the first time unit, and the phase-locked loop in the first time unit is The track...

Embodiment 3

[0187] An embodiment of the present invention provides a method for eliminating frequency offset jump.

[0188] When the terminal is moving at a high speed, the terminal receives symbols through the phase-locked loop in each time unit, performs tracking processing on the received symbols and outputs the tracking processed symbols; when the terminal switches from one RRU to another RRU, the terminal received The symbol will have a jump in frequency offset. At this time, the phase-locked loop cannot track the frequency change of the symbol when processing the symbol. Therefore, it is necessary to eliminate the impact of the jump in frequency offset on the symbol output by the phase-locked loop.

[0189] In the embodiment of the present invention, the time unit is the sum of multiple symbol lengths, that is, the phase-locked loop tracking process outputs multiple symbols in each time unit, and the current time unit is called the first time unit, and then the present invention is i...

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Abstract

The invention discloses a method and a device for eliminating frequency offset jump, and belongs to the field of mobile communication. The method comprises the following steps: performing frequency offset estimation on a symbol output by a phase-locked loop by tracking within a first time unit to obtain a first frequency offset estimation value of the first time unit; determining whether or not the frequency offset jump occurs on the symbol output by the phase-locked loop by tracking within the first time unit according to a second frequency offset estimation value of a second time unit and the first frequency offset estimation value of the first time unit, wherein the second time unit is ahead of the first time unit; and if so, eliminating frequency offset generated on the symbol output by the phase-locked loop by tracking within the first time unit by the frequency offset jump according to the first frequency offset estimation value of the first time unit and the second frequency offset estimation value of the second time unit. The device comprises a first acquisition module, a determination module and a first elimination module. Through adoption of the method and device, the frequency offset jump can be eliminated under the situation of not generating interference among users, and the system performance at a base station switching moment is enhanced.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and device for eliminating frequency offset jump. Background technique [0002] With the continuous construction, opening and use of high-speed railways and expressways, mobile communication systems need to transmit information through multiple base stations along the high-speed railways and expressways and high-speed mobile user equipment. The shift is serious, and when the user equipment is handed over from one base station to another base station or from one RRU (Remote Radio Unit, remote radio unit) to another RRU, the frequency of the signal received by the user equipment using a directional antenna will be changed by f 0 change to f 0 + f max or by f 0 -f max change to f 0 , where f 0 is the transmit frequency of the base station, f max It is the maximum frequency offset caused by motion, that is, the signal received by the user equipment has a frequency ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 任光亮杨丽花乐春晖
Owner HUAWEI TECH CO LTD
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