Frequency offset estimation method and frequency offset estimation device

A technology of frequency offset estimation and estimation unit, which is applied in the field of frequency offset estimation and can solve problems such as insufficient accuracy, insufficient frequency offset estimation range, and frequency offset inversion.

Active Publication Date: 2016-10-05
ZTE CORP
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Problems solved by technology

[0004] The first one uses the repeatability of the cyclic prefix (CP, Cyclic Prefix) to estimate the frequency offset, but the method of using the CP to estimate the frequency offset is not accurate enough, and the maximum error can reach several kilohertz
[0005] The second method uses two cell-specific reference signal (CRS, Cell-specific Reference Signals) pilot symbols in the frequency domain to perform frequency offset estimation, but the frequency offset estimation range of this method is not large enough, fo...

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  • Frequency offset estimation method and frequency offset estimation device
  • Frequency offset estimation method and frequency offset estimation device
  • Frequency offset estimation method and frequency offset estimation device

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Embodiment Construction

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0058] see figure 1 , which shows a frequency offset estimation method provided by an embodiment of the present invention, which can be applied to a network device that performs frequency offset estimation according to a downlink state, such as a mobile terminal, etc. The method may include:

[0059] S101: Perform frequency offset estimation according to the repeatability of the cyclic prefix CP, and obtain a first estimated frequency offset value;

[0060] Exemplarily, in this embodiment, step S101 may specifically include:

[0061] First, obtain the cross-correlation value cor_CP of the CP sequence and the original sequence identical to the CP sequence;

[0062] Then, according to the time difference NT between the CP sequence and the original sequence s and the cross-cor...

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Abstract

Embodiments of the invention disclose a frequency offset estimation method and a frequency offset estimation device. The method comprises the following steps: carrying out frequency offset estimation according to the repeatability of cyclic prefix CP to get a first frequency offset estimated value; getting at least one second frequency offset estimated value through a preset pilot pair, and getting a wide range of frequency offset estimated values to be chosen according to the at least one second frequency offset estimated value and preset operation rules; and getting an optimal frequency offset estimated value according to the first frequency offset estimated value, the wide range of frequency offset estimated values to be chosen and a preset range value.

Description

technical field [0001] The invention relates to communication signal processing technology, in particular to a method and device for frequency offset estimation. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology is a multi-carrier transmission technology in which sub-carriers are orthogonal to each other. This technology requires that sub-carriers are orthogonal to each other and is very sensitive to carrier frequency offset; so , the problem of carrier frequency offset has become one of the core problems of current OFDM technology. [0003] At present, for the problem of small frequency offset, there are many high-precision and simple methods; but for the problem of large frequency offset, two solutions are usually used: [0004] The first method uses the repeatability of a cyclic prefix (CP, Cyclic Prefix) to estimate the frequency offset, but the method of using the CP to estimate the fr...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/02H04L27/26
Inventor 许秋平刘源王守义
Owner ZTE CORP
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