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Multilevel 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: 2017-02-01
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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  • Multilevel frequency offset estimation method based on FFT
  • Multilevel frequency offset estimation method based on FFT
  • Multilevel 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 a multilevel frequency offset estimation method based on FFT. The method provided by the invention mainly comprises the following steps: setting carrier frequency offset estimation to multiple frequency offset estimation levels, which is characterized in that a lower extraction ratio corresponding to the frequency offset estimation increases with the increase of the frequency offset estimation levels; carrying out the frequency offset estimation starting from the first level frequency offset estimation, and calculating the frequency offset estimation result of each level before the frequency offset estimation level reaches a preset total level; and accumulating the frequency offset estimation result of each level, and using the obtained accumulated value as a final frequency offset estimation result. The multilevel frequency offset estimation method provided by the invention has the beneficial effects that compared with the traditional frequency offset estimation method based on the FFT, on the basis of guaranteeing the estimation range, the frequency offset estimation precision can be greatly improved.

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 Applications(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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