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A fast-changing channel estimation method based on LEO satellite system

A low-orbit satellite, channel estimation technology, applied in baseband systems, channel estimation, baseband system components and other directions, can solve the problem of not considering the high dynamic effects of satellite channels

Active Publication Date: 2019-05-03
西安电子科技大学昆山创新研究院 +1
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Problems solved by technology

In 2015, M.K., A performed channel estimation and signal detection on the cooperative link of the satellite-ground cooperative communication system, but did not consider the impact of the high dynamics of the satellite channel on the estimation, but in order to better obtain the cooperative diversity gain [5]

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  • A fast-changing channel estimation method based on LEO satellite system
  • A fast-changing channel estimation method based on LEO satellite system
  • A fast-changing channel estimation method based on LEO satellite system

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Embodiment Construction

[0063] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution, and provides detailed implementation and specific operation process, but the protection scope of the present invention is not limited to the present invention. Example.

[0064] The invention provides a low-complexity fast-changing sparse channel estimation suitable for low-orbit satellite AF amplification and forwarding protocols. Its core lies in the characteristics of the channel sparsity and the realization of the hybrid BEM model adaptive algorithm, that is, the pilot signal of the effective tap coefficient is extracted through the channel sparsity characteristic, and then the response of the sparse channel is obtained through the frequency offset and SNR adaptive selection estimation algorithm. like figure 1 Shown, concrete steps of the present invention are as follows:

[0065] (1) Const...

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Abstract

The invention discloses a rapid-varying channel estimation method based on a low earth orbit satellite system. On the basis of relatively large Doppler frequency shift of a low earth orbit satellite and time frequency double-selection characteristics of a relay cascaded channel, a basis expansion model (BEM Basis Expansion Model) of a cascaded channel under an amplify forward (AF, Amplify Forward) protocol is established, and a channel estimation algorithm applicable to the BEM model is analyzed. The method comprises steps that firstly, according to normalized Doppler frequency offset and a signal to noise ratio, a to-be-selected BEM model is determined; and secondly, a least square algorithm (LS) and a linear minimum mean squared error (LMMSE) algorithm are selected through utilizing the channel sparse characteristics to estimate a model coefficient. According to the method, the basis expansion model can be utilized to reduce to-be-estimated parameters of a rapid-varying channel, in combination with the channel sparse characteristics and the adaptive hybrid BEM model, estimation precision is guaranteed while complexity of an elliptic basis function BEM (DPS-BEM) model and the LMMSE algorithm is reduced, and thereby efficient and accurate estimation is realized.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a fast-changing channel estimation method based on a low-orbit satellite system. Background technique [0002] Low-orbit (LEO) satellite mobile communication system has the advantages of large satellite communication coverage area, strong mobility, high reliability, and high transmission rate. However, its communication channel has serious multipath effect and shadow fading, and in the application scenario of high-speed mobile communication, the relative speed between the satellite and the ground is high, and the channel coherence time is short, which intensifies the Doppler frequency shift and the dynamic change of the channel. Channel estimation in dynamic environments becomes particularly important. At the same time, OFDM adopts the orthogonal multi-carrier transmission mode, which has high-speed data transmission capability, efficient spectrum utilization and good anti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/0202H04L25/0222H04L27/2668
Inventor 李勇朝张学敏刘灿张锐阮玉晗张海林
Owner 西安电子科技大学昆山创新研究院
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