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Frequency offset estimation method in orthogonal frequency division multiplex OFDM system

A technology of frequency offset estimation and orthogonal frequency division, applied in the field of frequency offset estimation, can solve the problem of low efficiency of frequency offset adjustment

Active Publication Date: 2007-10-03
SHANGHAI ULTIMATE POWER COMM TECH
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  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a frequency offset estimation method in an orthogonal frequency division multiplexing system to solve the existing technology of frequency offset estimation through downlink synchronous OFDM symbols with limited length, which leads to low frequency offset adjustment efficiency question

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  • Frequency offset estimation method in orthogonal frequency division multiplex OFDM system
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Embodiment Construction

[0020] Since the frequency offset estimation is mainly applied to the initial cell search process performed by the user equipment UE, in order to describe the technical solution of the present invention more clearly, the main process of the initial cell search is briefly introduced. When the UE is powered on, it will perform initial cell search, system synchronization and frequency offset correction. This embodiment takes an evolved TD-SCDMA mobile communication system (a TDD OFDM system) in LTE as an example to describe in detail. The system synchronization generally uses the OFDM symbols of the SCH channel to perform coarse synchronization in time. The OFDM symbols in the SCH channel have repetition in the time domain. By performing differential correlation, the time coarse synchronization in the time domain can be realized. That is, the position of the SCH symbol in the entire received sequence is roughly known.

[0021] Thereafter, frequency offset correction is performed...

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Abstract

This invention discloses a method for estimating frequency deviation in OFDM system, which first of all carries out deltafcoarse estimation based on the received front and back two sequences of the received down-line synchronous OFDM symbol, then caries out deltafcoarse adjustment to two arrays of pilot symbols and again carries out deltaffine estimation based on the two arrays of pilot symbols and finally carries out total frequency deviation estimation based on them.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a frequency offset estimation method in an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] With the increase of people's demand for high-speed digital communication technology, Orthogonal Frequency Division Multiplexing (OFDM) technology is attracting more and more attention because of its extremely high spectral efficiency and good adaptability to time-dispersed channels. It is considered to be the supporting technology of the fourth generation mobile communication system in the future. OFDM is a multi-carrier transmission technology that divides the entire channel into N sub-channels and transmits information in parallel. OFDM technology is mainly used in (fourth generation) mobile communication systems, broadband wireless access, etc. In the application of digital cellular mobile communication, OFDM is also one of ...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 于洋孙韶辉王映民
Owner SHANGHAI ULTIMATE POWER COMM TECH
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