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Ofdm frequency offset estimation method, system and device based on ieee802.11

A technology of frequency offset estimation and estimated value, applied in the field of OFDM frequency offset estimation based on IEEE802.11, it can solve the problems of high complexity, low accuracy and poor real-time performance, and achieves low complexity, strong real-time performance and high The effect of accuracy

Active Publication Date: 2021-12-07
ALLWINNER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention proposes an OFDM frequency offset estimation method, system and device based on IEEE802.11. The method, system or device completes local correlation calculations in the frequency domain, and utilizes the frequency domain local correlation of the Signal part Improve the accuracy of frequency offset estimation, and solve the problems of low accuracy, high complexity, and poor real-time performance of existing carrier frequency offset estimation methods

Method used

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  • Ofdm frequency offset estimation method, system and device based on ieee802.11
  • Ofdm frequency offset estimation method, system and device based on ieee802.11
  • Ofdm frequency offset estimation method, system and device based on ieee802.11

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Embodiment 1

[0064] Such as Figure 4 Shown, a kind of OFDM frequency offset estimation method based on IEEE802.11 comprises the following steps:

[0065] S1: Perform forward and backward autocorrelation calculations on the two identical long training sequences (LTF) in the Preamble of the received signal in the time domain to obtain the estimated value of the first carrier frequency offset

[0066] S2: According to the estimated value of the first carrier frequency offset Carrier frequency offset compensation in the time domain is performed on the Signal of the received signal.

[0067] S3: Convert the compensated Signal from a time-domain signal to a frequency-domain signal.

[0068] S4: Analyze the Signal in the frequency domain, and re-modulate the analyzed information to obtain the frequency domain reference signal

[0069] S5: The frequency domain reference signal Perform local correlation calculation with the Signal in the frequency domain to obtain the estimated value of ...

Embodiment 2

[0107] An OFDM frequency offset estimation system based on IEEE802.11, including a first frequency offset estimation unit, a Signal frequency offset compensation unit, a Fourier transform unit, a frequency domain reference signal acquisition unit, a second frequency offset estimation unit, and a Payload frequency offset compensation unit .

[0108] The first frequency offset estimation unit is used to perform forward and backward autocorrelation calculations on the two identical long training sequences in the Preamble of the received signal in the time domain to obtain the first carrier frequency offset estimation value

[0109] Signal frequency offset compensating unit, used for according to the first carrier frequency offset estimated value Carrier frequency offset compensation in the time domain is performed on the Signal of the received signal.

[0110] The Fourier transform unit is used to convert the compensated Signal from a time-domain signal to a frequency-domain ...

Embodiment 3

[0149] This embodiment provides an OFDM frequency offset estimation device based on IEEE802.11, including: a memory, a processor, and a computer program stored on the memory and operable on the processor, and the computer program is executed by the processor to realize the embodiment Steps S1-S6 of the method of 1.

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Abstract

The invention discloses an OFDM frequency offset estimation method, system and device based on IEEE802.11. The method comprises the following steps: performing forward and backward autocorrelation calculations on two identical long training sequences in the Preamble of the received signal in the time domain to obtain an estimated value of the first carrier frequency offset; Carrier frequency offset compensation in the time domain; convert the compensated Signal from the time domain signal to the frequency domain signal; analyze the signal in the frequency domain to obtain the frequency domain reference signal; perform local correlation between the frequency domain reference signal and the signal in the frequency domain The calculation is performed to obtain the second estimated carrier frequency offset; according to the first estimated carrier frequency offset and the second estimated carrier frequency offset, time-domain carrier frequency offset compensation is performed on the Payload. Combining Preamble's time-domain carrier frequency offset estimation and Signal's frequency-domain carrier frequency offset estimation, Payload can finally obtain more accurate time-domain carrier frequency offset estimation compensation; it has high accuracy, low complexity, and strong real-time performance The advantages.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an IEEE802.11-based OFDM frequency offset estimation method, system and device. Background technique [0002] IEEE802.11 is a communication protocol based on OFDM (Orthogonal Frequency Division Multiplexing) technology. This technology improves throughput by sending multiple subcarriers at the same time. Each subcarrier carries different information. Since the subcarriers are orthogonal, there is no mutual interference. However, OFDM technology is very sensitive to carrier frequency offset (CFO), because carrier frequency offset not only introduces phase rotation to subcarrier information, but also destroys the orthogonality between subcarriers, causing subcarriers to interfere with each other (ICI). [0003] Therefore, the OFDM technology receiver must have effective carrier frequency offset estimation and compensation. [0004] For the IEEE802.11 protocol, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0014H04L27/2656H04L2027/0026
Inventor 朱嘉俊
Owner ALLWINNER TECH CO LTD