A method for estimating maximum Doppler shift in Rayleigh channel
A Doppler frequency shift and channel technology, applied in the field of Rayleigh channel maximum Doppler frequency shift estimation
Active Publication Date: 2021-05-14
HEFEI UNIV OF TECH
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[0004] The purpose of the present invention is to provide a kind of using singular value decomposition to retain the characteristics of the complete signal, so that the estimated maximum Doppler frequency shift and the ratio of the noise bandwidth meet the given error requirements, which solves the problem in the Rayleigh channel Estimation of the maximum Doppler shift of the received signal in the presence of noise based on a method for estimating the maximum Doppler shift of the Rayleigh channel
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[0037] The theory of singular value decomposition shows that useful signals and noise signals can be effectively separated through singular value decomposition, and the singular value obtained after decomposition is an inherent property of the signal. Selecting the reconstruction order of the filtered signal by estimating the signal-to-noise ratio method can effectively remove part of the noise signal and retain the complete characteristics of the useful signal. According to the relationship between the maximum Doppler frequency shift and the noise bandwidth of the received signal under noise, find the best filter bandwidth by looking for the reconstruction order of the signal to ensure that the estimated maximum Doppler frequency shift and noise bandwidth meet the given In order to obtain the true maximum Doppler frequency shift of the received signal within the required range of the specified error.
[0038] The method comprises the steps of the following order: (1) collecti...
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The invention relates to a method for estimating the maximum Doppler frequency shift of a Rayleigh channel, comprising: collecting a received signal sequence, constructing a received signal matrix; performing singular value decomposition on the matrix, and calculating the energy spectrum of the matrix; estimating the signal-to-noise ratio of the received signal sequence; Determine the reconstruction order of the received signal sequence; reconstruct the received signal sequence; judge whether the reconstructed received signal sequence noise bandwidth and the estimated value of the maximum Doppler frequency shift satisfy the inequality relationship, if not, increase the received signal sequence Construct the order and repeat steps (5), (6) until the reconstructed received signal sequence noise bandwidth and maximum Doppler frequency shift satisfy the inequality relationship. The present invention searches for the best noise bandwidth by increasing the order of the reconstructed signal, so that the noise bandwidth and the maximum Doppler frequency shift satisfy the given inequality, and solves the estimation of the maximum Doppler frequency shift of the Rayleigh channel under the noise-containing signal The problem is to realize the accurate estimation of the maximum Doppler shift of the Rayleigh channel within a given error.
Description
technical field [0001] The invention relates to the technical field of wireless channels, in particular to a method for estimating the maximum Doppler frequency shift of a Rayleigh channel. Background technique [0002] As a high-speed communication medium, the extraction of characteristic parameters of the wireless channel presents a huge challenge. The extraction of the characteristic parameters of the wireless channel is of great significance to the power control and resource allocation of the communication system. Wireless channels are easily affected by noise and other channel factors, making the extraction of wireless channel characteristic parameters a difficult problem, especially due to the dynamic changes of mobile terminals that cause channel parameters to change over time, the time-varying nature and complexity of wireless channels have become constraints for wireless It is one of the major topics of channel feature parameter extraction. [0003] When the signal...
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IPC IPC(8): H04L25/02H04B17/309
Inventor 袁莉芬姚永健何怡刚袁志杰程珍索帅
Owner HEFEI UNIV OF TECH