Frequency range limited-based adaptive length-variable frequency offset estimation method
A technology for frequency offset estimation and frequency range, which is applied in digital transmission systems, electrical components, modulated carrier systems, etc. It can solve the problems that affect the accuracy of frequency offset estimation, decrease in anti-noise performance, and random changes in signal-to-noise ratio. Computational complexity of autocorrelation, effect of improving noise immunity and accuracy
Active Publication Date: 2018-02-09
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology
These schemes are difficult to implement in environments where the signal-to-noise ratio varies randomly and require low autocorrelation computational complexity
For existing frequency estimation methods based on limited frequency ranges that can control the complexity of autocorrelation operations, although the complexity of autocorrelation operations can be controlled by adjusting the length of the relevant data segment, these methods cannot adaptively control and adjust the correlation The length of the data segment, and ignoring the decline in anti-noise performance caused by shortening the length of the relevant data segment, and the reduction of the frequency offset estimation range caused by excessive expansion of the correlation length, these shortcomings directly affect the frequency offset estimation Accuracy, it is necessary to propose a new frequency offset estimation method, so as to take advantage of random SNR changes and deal with high correlation calculation complexity
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.
[0015] The present invention comprises the following steps:
[0016] Step 1: According to the upper limit f of the frequency offset in the system Δ_max Get the maximum value L of the participating related data length L max , let the sampling period of the received signal be T s ,Right now
[0017]
[0018] Step 2: by L max Determine the number N of Frank sequences in the special data segment. Let the length of the Frank sequence be M, then round down;
[0019] Step 3: Construct two adjacent data structures containing several Frank sequences as frequency offset estimation data segments. That is, each piece of data structure contains N consecutive Frank sequences, the structure and data of the two are completely consistent, and the length is NM. The data structure...
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The invention provides a frequency range limited-based adaptive length-variable frequency offset estimation method. The adaptive length of an auto-correlated special data field is obtained through therandomly-changed signal-to-noise ratio, the auto-correlation operation complexity of the special data field is reduced by limiting the frequency offset estimation range, adaptive changing of the signal-to-noise ratio is achieved on the condition that the auto-correlation operation complexity is controlled, and the noise immunity and the precision of frequency offset estimation are improved.
Description
technical field [0001] The invention relates to a downlink frequency offset estimation method in a broadband digital signal processing system, and belongs to the related technical fields of mobile communication, interference suppression, digital signal processing and the like. Background technique [0002] In order to eliminate the frequency offset caused by the Doppler effect and the inconsistency of the crystal oscillator at the receiving and receiving ends in the wideband digital receiver system, a frequency offset estimation technique based on a limited frequency range is proposed. This technology is obtained based on the data autocorrelation in the received data segment. Using two special identical data segments in the received data, the correlation value is a correlation operation, and the accumulation of frequency offset in time is obtained, thereby analyzing and estimating the frequency offset. The correlation value of the special data segment in the received signal ...
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IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 黄子甲杨卓凯
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP