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OFDM signal symbol synchronization error estimation method based on CIR peak value

A technology of signal symbols and synchronization errors, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as inability to accurately calculate frequency offset, system impact, and inability to accurately estimate channel response

Active Publication Date: 2020-12-25
THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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  • Abstract
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Problems solved by technology

[0002] For the OFDM system, accurate symbol synchronization is very important to the system. However, due to the influence of Doppler frequency offset and multipath interference, there will be certain timing errors in symbol synchronization.
If the symbol synchronization is not accurate, it will have a great impact on the system
First of all, when the system performs frequency offset correction, due to synchronization errors, the repeated training sequences cannot be strictly aligned during autocorrelation, resulting in the inability to accurately calculate the frequency offset; secondly, when estimating the channel response, the frequency domain There is a certain phase rotation in the channel response, which makes it impossible to accurately estimate the channel response

Method used

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  • OFDM signal symbol synchronization error estimation method based on CIR peak value
  • OFDM signal symbol synchronization error estimation method based on CIR peak value
  • OFDM signal symbol synchronization error estimation method based on CIR peak value

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Embodiment

[0108] In this embodiment, the parameters are described as follows: the number of subcarriers N=512, the constellation mapping method is 4QAM, the CP length is M=64, and the pilot interval is L=128. The symbol synchronization error is respectively set to lag 10 sampling points and advance 10 sampling points in two cases.

[0109] The simulation results show that when there is a symbol synchronization lag of 10 sampling points, the bit error rate (BER) curve remains almost flat and cannot decrease with the increase of the signal-to-noise ratio (SNR), indicating that the BER reception performance is extremely degraded. After the synchronization error is corrected, the BER curve almost coincides with the curve when the synchronization is accurate, indicating that a good synchronization error correction effect has been achieved; when the symbol synchronization is advanced by 10 sampling points, BER=10 -4 , compared with the curve with accurate synchronization, the SNR is about 0.3...

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Abstract

The invention provides an OFDM signal symbol synchronization error estimation method based on a CIR peak value, which comprises the following steps that: a transmitting end inserts a comb-shaped pilotfrequency into a frequency domain data block and inserts a training sequence in front of a first time domain symbol block; and a receiving end performs symbol synchronization through the training sequence, completes synchronization error estimation through the pilot frequency in the first time domain symbol block, and then performs error correction on a received signal according to the error. According to the method provided by the invention, a better symbol synchronization error estimation and correction effect can be obtained.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for estimating a symbol synchronization error of an Orthogonal Frequency Division Multiplexing (OFDM) signal based on a peak value of a channel impulse response (CIR). Background technique [0002] For the OFDM system, accurate symbol synchronization plays a very important role in the system. However, due to the influence of Doppler frequency offset and multipath interference, there will be certain timing errors in symbol synchronization. If the symbol synchronization is inaccurate, it will have a great impact on the system. First of all, when the system performs frequency offset correction, due to synchronization errors, the repeated training sequences cannot be strictly aligned during autocorrelation, resulting in the inability to accurately calculate the frequency offset; secondly, when estimating the channel response, the frequency domain There is a cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2671H04L27/2672H04L27/2668H04L27/2662H04L27/2675Y02D30/70
Inventor 周洋朱辉丁欣万飞
Owner THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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