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Frequency Offset Estimation Method and System Based on Repeated Sequence

A technique of frequency offset estimation and repetitive sequence, applied in the field of frequency offset estimation based on repetitive sequence, can solve the problem of reducing the accuracy of frequency offset estimation, and achieve the effect of improving the accuracy

Active Publication Date: 2020-09-11
BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be analyzed that this large frequency offset coverage reduces the frequency offset estimation accuracy under the same data length and signal-to-noise ratio compared to the small frequency offset coverage scheme

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  • Frequency Offset Estimation Method and System Based on Repeated Sequence
  • Frequency Offset Estimation Method and System Based on Repeated Sequence
  • Frequency Offset Estimation Method and System Based on Repeated Sequence

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Embodiment Construction

[0013] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0014] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0015] In order to improve the accuracy of frequency offset estimation in the case of large frequency offset coverage, the present invention provides a frequency offset estimation method and system based on repeated sequences. First, the length is 1 / G of the FFT length of OFDM (G is an integer greater than 1) as the interval to perform autocorrelation and accumulation operations on the captured sampled signals, and estimate...

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Abstract

Disclosed in the present application are a repetitive sequence-based frequency offset estimation method and system. The method comprises: performing autocorrelation operation on sampling signals with a length Ng as an interval and performing summation to obtain a value, obtaining a first frequency offset estimation value according to the phase of the value, and recording the relative frequency offset of the first frequency offset estimation value with respect to a subcarrier spacing as a first relative frequency offset value, wherein Ng=N / G, N is the length of baseband Fourier transform, and G is an integer greater than 1; performing autocorrelation operation on the sampling signals with a length Nh as an interval and performing summation to obtain another value, obtaining a second frequency offset estimation value according to the phase of the value, and recording the relative frequency offset of the second frequency offset estimation value with respect to the subcarrier spacing as a second relative frequency offset value, wherein Nh＝N*h, and h is an integer greater than or equal to 1; and calibrating the second relative frequency offset value by means of the first relative frequency offset value. The frequency offset estimation method and system can improve the frequency offset estimation precision in a large frequency offset coverage range.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a frequency offset estimation method and system based on repeated sequences. Background technique [0002] Initial synchronization acquisition in the receiver generally requires synchronization to be achieved in the presence of frequency offsets between the transceivers. In order to ensure acquisition and synchronization under large frequency offset, repeated sequences are often used in OFDM (Orthogonal Frequency Division Multiplexing) systems. Synchronization schemes based on repetitive sequences often use sliding autocorrelation operations. Within a certain range of initial frequency deviation, when the receiving window slides to the starting position of the repetitive signal, the autocorrelation amplitude reaches the maximum, and the angle of the autocorrelation value at this time can be estimated frequency deviation. In order to reduce the requirements on the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/00
CPCH04L27/0014H04L27/2672H04L2027/0026
Inventor 赵亚红赵旭赵东艳王于波张玉冰胡健武闫发军杨季唐晓柯
Owner BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY