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A Multi-stage Frequency Offset Estimation Method Based on fft

A technology of frequency offset estimation and carrier frequency offset, which is applied in the field of communication, can solve problems such as accumulation, affecting the performance of frequency offset estimation, and the number of FFT points η cannot be increased infinitely, so as to achieve the effect of reducing the variance flat layer and improving the accuracy of frequency offset estimation

Active Publication Date: 2019-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In fact, the number of FFT points η cannot be increased infinitely, because the computational complexity increases with the increase of the number of FFT points η, so increasing the number of FFT points η is not applicable
In the process of high-order spectral analysis of the signal, the noise will continue to accumulate with the increase of the spectral order, which seriously affects the performance of frequency offset estimation, so it is not applicable

Method used

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  • A Multi-stage Frequency Offset Estimation Method Based on fft
  • A Multi-stage Frequency Offset Estimation Method Based on fft
  • A Multi-stage Frequency Offset Estimation Method Based on fft

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0033] Taking the Additive White Gaussian Noise (AWGN) channel environment as an example, FFT-based multi-level frequency offset estimation is performed, the selected pseudo-random sequence P is m sequence, and the number of symbols contained in each sequence L=31, Symbol rate R s =1Mbps, the total number of sequences N=48, such as figure 1 shown, the following steps are included:

[0034] S1. Determine the total number of stages K, the array μ and the number of FFT points η formed by the multiples of downsampling corresponding to each stage: According to past experience, K=[log 5 (N / 6)+1], "[]" means rounding, N is the number of sequences, μ(1)=1, Indicates rounding down, η is a power of 2, and as large as possible, the choice of η is related to specific equipment, usually 1024, 2048 or 4096; in this example, the total number of series ...

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Abstract

The invention belongs to the technical field of communication, and relates to an FFT-based multi-stage frequency offset estimation method. The main method of the present invention is as follows: the carrier frequency offset estimation is set to a plurality of frequency offset estimation series, and the feature is that the downsampling multiple corresponding to the frequency offset estimation increases with the increase of the frequency offset estimation series; The frequency offset estimation series starts to perform frequency offset estimation, and the frequency offset estimation results of each level are calculated before the frequency offset estimation series reaches the preset total number of series; the frequency offset estimation results of each level obtained in the steps are accumulated, and the obtained The accumulated value is used as the final frequency offset estimation result. The beneficial effect of the invention is that, compared with the traditional frequency offset estimation method based on FFT, the invention can significantly improve the frequency offset estimation precision on the basis of ensuring the estimation range.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to an FFT-based multi-stage frequency offset estimation method. Background technique [0002] In a wireless communication system, carrier frequency synchronization is the premise and basis for correct data transmission, but usually, the carrier of the received signal is not completely synchronized with the local carrier, and there is a frequency offset (referred to as frequency offset), and even if the transmitter and the local carrier The receiver uses a very precise oscillator, the initial frequency deviation is very small, but due to other factors such as Doppler frequency shift, the frequency deviation still exists, especially when the receiver is in a moving state, due to the Doppler frequency generated by the relative motion of the transceiver. The effect will lead to a large deviation between the carrier frequency of the received signal and the carrier frequency of the tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2628H04L27/2659H04L27/266H04L27/2695
Inventor 周世阳程郁凡王若宇郭红敬李曼姝
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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