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Multi-path channel estimation method

A channel estimation and channel technology, which is applied in the field of information transmission, can solve the problems of inaccurate multipath channel model, low level of refinement, and inability to obtain signals, etc., to achieve reduced complexity, stable performance, and strong anti-interference Effect

Inactive Publication Date: 2009-07-01
TSINGHUA UNIV
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Problems solved by technology

[0009] In the existing channel estimation methods, there are many estimations of the multipath channel model parameter A in formula (2) i with d i The method generally has two steps of rough estimation and fine estimation. In the process of obtaining the rough estimation and fine estimation of channel parameters, the calculation is generally complicated and the degree of refinement is not high, so the final multipath channel model is not enough. Accurate, can not get the exact original sent signal

Method used

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Embodiment

[0044] For the multipath channel model in this embodiment, its impulse response h(n) is represented by a typical method in the prior art, that is, the impulse response of the established multipath channel model is represented by a sparse representation, as shown in the formula (2) as shown:

[0045] h ( n ) = Σ i = 1 M ≤ 20 M - 1 A i δ ( n - d i ) - - - ( 2 )

[0046] In the formula (2), M is the number of paths of the multipath channel. In the existing analysis, the...

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Abstract

The invention relates to a multipath channel estimation method which comprises the following steps: roughly estimating a multipath channel to obtain an initial estimated value of a multipath channel time-lay di; calculating an initial estimated value of an amplitude adjustment coefficient Ai from the initial estimated value of the multipath channel time-lay di; refining the multipath channel time-lay di and the amplitude adjustment coefficient Ai by using a matching pursuit (MP) method to obtain refined multipath channel time-lay di and the amplitude adjustment coefficient Ai; and determining an impulse response h(n) of the multipath channel according to the path number M of the multipath channel and the estimated values of the multipath channel time-lay di and the amplitude adjustment coefficient Ai, and obtaining a multipath channel model. The method can better optimize channel parameters, construct more precise channels, and improve the anti-jamming property and robustness of the multipath channel.

Description

technical field [0001] The invention relates to the field of information transmission, in particular to a multipath channel estimation method. Background technique [0002] Channels (information channels) are signal transmission media, which can be divided into wired channels and wireless channels. Wired channels include open wires, symmetrical cables, coaxial cables, and optical cables; wireless channels include ground wave propagation, shortwave ionospheric reflection, ultrashort wave or microwave line-of-sight relays, artificial satellite relays, and various scattering channels. The signal propagates in the wireless channel, and the received signal is not only obtained through a single direct path, but also includes reflection, diffraction and data signals arriving on different paths. This phenomenon is called multipath propagation, and the channel is called multipath channel (Multi-path channel) channel). [0003] When a signal is transmitted over a multipath channel, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
Inventor 杨林于燕斌李春艳
Owner TSINGHUA UNIV
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