Uplink frequency offset correction method and device

A frequency offset and frequency offset estimation technology, applied in the field of mobile communication, can solve problems such as no solution, achieve the effect of eliminating frequency offset and improving data receiving performance

Inactive Publication Date: 2020-07-17
POTEVIO INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the fixed phase difference φ between OFDM symbols, the traditional frequency offset elimination method mentioned above can be eliminated in the channel estimation process. However, there is no corresponding solution for the frequency offset of frequency domain data.

Method used

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  • Uplink frequency offset correction method and device
  • Uplink frequency offset correction method and device
  • Uplink frequency offset correction method and device

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Embodiment Construction

[0025] 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.

[0026] The core idea of ​​the present invention is: after receiving the UE data, first judge the number of effective RRUs receiving the UE data, if it is a single RRU, perform equalization processing and inverse Fourier (IDFT) transformation on the received data before performing data symbol frequency offset correction; if there are multiple RRUs, the received data on each effective RRU is converted to the time domain after resource mapping and before equalization processing, and the frequency offset correction of data symbols is performed in the time domain. In this way, the influence of the frequency offset can be better eliminated, and the performance of data reception can be improved.

[0027] figure 2 It is a schematic flow diagram...

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Abstract

The application discloses an uplink frequency deviation correction method and device. The method comprises the following steps: determining effective RRU number receiving user equipment UE data; triggering a corresponding receiving data processing procedure according to the determined effective RRU number; when the effective RRU number is one, converting a processing result to a time domain after the channel estimation and the equilibrium processing are performed on the receiving data on the RRU, and performing the frequency deviation correction of a data symbol on the result converted to the time domain; when the effective RRU number is multiple, converting the processing result to the time domain after performing the resource de-mapping and before performing the equilibrium processing on the receiving data on each effective RRU, performing the frequency deviation correction of the data symbol on the result converted to the time domain, and converting the frequency deviation correction result to the frequency domain, and then performing the equilibrium processing. By using the correction method disclosed by the application, the frequency deviation of the frequency domain data can be effectively eliminated, and the data receiving performance is improved.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to an uplink frequency offset correction method and device. Background technique [0002] In the communication system, the high-speed movement of the terminal will cause Doppler frequency shift. For example, if the terminal is traveling at a speed of 300km / h and the carrier frequency is 2.6GHz, the maximum Doppler frequency shift generated can reach 722Hz. In the uplink, the Doppler frequency shift caused by the movement of the terminal will reach twice the maximum Doppler frequency deviation above. Under certain conditions, the uplink frequency deviation can reach up to 1444Hz. Under such frequency deviation conditions, if some measures are not taken, the uplink data cannot be received correctly. [0003] The distributed antenna system realizes the combination of multiple cells through the network structure of baseband processing unit (BBU) + remote radio unit (RRU). One...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/266H04L27/2688
Inventor 于小红
Owner POTEVIO INFORMATION TECH CO LTD
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