Frequency offset estimation method and base station

A frequency offset estimation and base station technology, applied in multi-frequency code systems, digital transmission systems, electrical components, etc., can solve the problems of long frequency offset estimation time, long frequency offset tracking time, and affecting system performance, etc., to achieve shortened frequency offset Estimated time, improving system performance, and reducing the effect of not being able to obtain frequency offset in time

Active Publication Date: 2014-01-22
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0007] In the existing frequency offset estimation method, in the frequency offset tracking process, it may be necessary to traverse all intervals and measure multiple times to obtain the correct frequency offset value, resulting in a long frequency offset tracking time, which in turn makes the frequency offset estimation time too long and affects the system. performance

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  • Frequency offset estimation method and base station
  • Frequency offset estimation method and base station
  • Frequency offset estimation method and base station

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] An embodiment of the present invention provides a frequency offset estimation method, the implementation of which is as follows figure 1 As shown, it specifically includes the following operations:

[0030] S101. When the frequency offset estimation interval currently performed by the base station is incorrect or uncertain, the base station triggers the UE to send a specified Preamble;

[0031] Wherein, a specific implementation manner of S101 may be: the b...

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Abstract

The invention relates to a frequency offset estimation method and a base station. The method comprises the following steps that: when an interval in which a base station carries out frequency offset is not correct or is not determined, the base station triggers user equipment to send an assigned Preamble; and the base station receives the assigned Preamble that is sent by the user equipment and measures the Preamble to obtain a frequency offset value. In addition, the embodiment of the invention also provides a base station. When it is needed for the base station to start an interval search of frequency offset, the interval search is not carried out according to a current flow; instead, user equipment is triggered to send assigned Preamble and then an accurate frequency offset value can be obtained by measurement on the Preamble. Compared with the prior art, the technology employed in the invention enables time for frequency offset estimation to be substantially shortened; and affect that a frequency offset can not be obtained timely due to traversing the whole frequency offset interval, so that a system performance is enhanced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of wireless communication, and in particular, to a frequency offset estimation method and a base station. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplex, Orthogonal Frequency Division Multiplex) technology is a key technology of LTE (Long Term Evolution, long-term evolution) system, which has the advantages of high spectrum utilization and strong resistance to multipath interference; Relatively sensitive, a small frequency offset may also destroy the orthogonality between subcarriers of the OFDM system, thereby greatly affecting the communication quality and causing a significant decline in system performance. Therefore, fast frequency offset estimation technology becomes the key to affect system performance. [0003] In the high-speed rail scenario, the implementation of frequency offset estimation is as follows: [0004] In the initial access process, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L27/26
Inventor 李彬苏威
Owner HUAWEI TECH CO LTD
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