Method of low-complexity frequency deviation estimation based on adjustable time frequency training sequence

A technology of training sequence and frequency offset estimation, applied in multi-frequency code system, modulated carrier system, digital transmission system, etc., can solve the problems of small capture range, high computational complexity, and high load, so as to reduce time consumption and improve accuracy Probability, the effect of rich flexibility

Inactive Publication Date: 2005-09-07
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

The traditional frequency synchronization methods are either based on the frequency domain training sequence or the time domain training sequence to estimate the carrier frequency offs

Method used

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  • Method of low-complexity frequency deviation estimation based on adjustable time frequency training sequence
  • Method of low-complexity frequency deviation estimation based on adjustable time frequency training sequence
  • Method of low-complexity frequency deviation estimation based on adjustable time frequency training sequence

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Embodiment Construction

[0027] Assume that the number of subcarriers contained in an OFDM symbol is N, and the length of the CP is N g . The length of the frequency domain sequence TS 1 is N F =αN, composed of K non-zero pilots with unequal spacing, the non-zero pilots are used p ~ K = [ p ~ i 0 , p ~ i 1 , · · · p ~ i K - 1 ] T Rep...

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Abstract

The invention discloses a low-complexity frequency bias estimating method based on a regulable time frequency training sequence, a frequency synchronizing method applied to OFDM system and other blocked transmitting systems, where the regulable time-frequency training sequence is composed of alpha N-long frequency domain sequence TS1 and (1-alpha)N-long time frequency sequence TS2, where the length ratio of the two parts is regulable and the total length keeps invariant; for resisting the interference IS1 between symbols, it inserts a Ng-long circulating prefix in both the two parts; the frequency domain sequence TS1 is composed of K inequi-distant pilot frequencies and the time domain sequence TS2 is composed of P same-length U subsequences; by choosing the parameters, the corresponding frequency bias estimators can obtain different balance of complex property, thus applied to different wireless mobile scenes. Wherein, Ng should be greater than the maximum time delay extension of wireless multipath channel, and PU= (1-alpha)N.

Description

technical field [0001] The invention relates to a frequency synchronization method applied to an Orthogonal Frequency Division Multiplexing (OFDM) system and other block transmission systems, and belongs to the technical field of synchronization in mobile communication. Background technique [0002] Frequency synchronization is a prerequisite for normal communication in a mobile communication system. In order to support high-speed data services, the future mobile communication system will be a broadband, multi-antenna system, and OFDM is an important candidate for the future mobile communication system. For future mobile wireless communications, the time-varying characteristics of broadband wireless channels will affect the carrier frequency and cause it to shift, thus destroying the orthogonality between subcarriers in the OFDM system. Compared with single-carrier systems, OFDM systems are more sensitive to carrier frequency offset. How to reduce ...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2657H04L27/2651H04L27/262H04L27/2669
Inventor 尤肖虎高西奇蒋雁翔
Owner SOUTHEAST UNIV
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