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Method and device for estimating maximum Doppler frequency offset

A Doppler frequency offset, the largest technology, applied in the field of estimation of the maximum Doppler frequency offset, can solve the problems of low estimation accuracy and poor stability of the estimated value, achieve high estimation accuracy and improve stability

Inactive Publication Date: 2010-12-08
ZTE CORP
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  • Application Information

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Problems solved by technology

[0006] The present invention is proposed in view of the poor stability or low estimation accuracy of the estimated value of the algorithm for obtaining multi-frequency offset information in the related art. Therefore, the main purpose of the present invention is to provide an improved maximum Doppler frequency offset estimation scheme , to address at least one of the above

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  • Method and device for estimating maximum Doppler frequency offset
  • Method and device for estimating maximum Doppler frequency offset
  • Method and device for estimating maximum Doppler frequency offset

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[0030] Functional Overview

[0031] Considering the problem of poor stability or low estimation accuracy of the estimated value of the algorithm for obtaining multi-frequency offset information in the related art, an embodiment of the present invention provides a Doppler frequency offset acquisition method for a CMMB system, which uses the discrete frequency domain received signal The pilot frequency is used to obtain the Doppler frequency offset. Based on the spectral method, the Doppler frequency offset is estimated by detecting the spectral width; according to the possible size of the Doppler value, an appropriate filter is selected to filter the spectrum, and then the spectrum is folded in half. Averaging, through detection and filtering, the averaged spectrum is folded in half, so that the algorithm can obtain high stability in the harsh environment with low signal-to-noise ratio. The estimation of Doppler frequency offset does not need to obtain the channel signal-to-noi...

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Abstract

The invention discloses a method and a device for estimating the maximum Doppler frequency offset. The method comprises the following steps of: calculating channel estimation according to received signals; calculating an amplitude spectrum of the channel estimation, and filtering the amplitude spectrum; performing folding average on the amplitude spectrum after filtering; estimating the level of noise; calculating a detection threshold; and calculating and outputting the maximum Doppler frequency offset. The method and the device solve the problems that the estimation value of an algorithm for acquiring information of the Doppler frequency offset has poor stability or low estimation accuracy, further improve the stability and can acquire higher estimation accuracy.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for estimating the maximum Doppler frequency offset. Background technique [0002] At present, Orthogonal Frequency Division Multiplexing (abbreviated as OFDM) has been widely used in various wireless communication systems, for example, digital video broadcasting (Digital Video Broadcasting, abbreviated as DVB), wireless local area network (Wireless Local Area Network, referred to as WLAN), China Mobile Multimedia Video Broadcasting (China Mobile Multimedia Broadcasting, referred to as CMMB), etc. These systems are required to work effectively in various channel environments, for example, to adapt to various speed ranges, various carrier frequencies, various time delays, and Signal Noise Ratio (SNR) of mobile stations. Therefore, it is very important to judge the channel quality and the speed of change in advance. With the continuous change of the channel en...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
CPCH04L25/022H04L27/2647H04L25/0222
Inventor 姚扬中曹南山李强邱宁张涛游月意
Owner ZTE CORP