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Method for estimating channel shock response effective orders in wireless communication system

A channel impulse response and wireless communication system technology, applied in the direction of multi-frequency code system, etc., can solve the problem that the autocorrelation matrix is ​​difficult to obtain, and achieve the effects of reducing sensitivity, improving estimation performance, and reducing impact

Inactive Publication Date: 2006-11-15
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

In mobile communication systems, due to the time-varying nature of the channel, it is difficult to obtain a high-precision autocorrelation matrix

Method used

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  • Method for estimating channel shock response effective orders in wireless communication system
  • Method for estimating channel shock response effective orders in wireless communication system
  • Method for estimating channel shock response effective orders in wireless communication system

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Embodiment Construction

[0020] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] figure 1 Given the estimation object in the embodiment, the coefficient amplitude of each order of the channel impulse response is c=0.08.

[0022] According to the method for estimating the effective order of the channel impulse response proposed by the present invention, the specific implementation steps are as follows:

[0023] (1) According to the pilot sequence X of the system transmitter p And the response sequence Y corresponding to the pilot sequence at the receiving end p , using the LS least squares method to obtain the estimated channel impulse response sequence

[0024] According to the LS method, according to Min{(Y p -X p f p h)H(Y p -X p f p h)} estimate the channel impulse response sequence h ^ ls = F ...

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Abstract

The invention relates to a method for estimating effective order or channel impulse response in wireless communication system, adopting least square method to obtain the estimated channel impulse response sequence and finding mod of each element in the sequence and obtaining energy sequence of the channel impulse response, selecting a reference element from the energy sequence, summing the reference element and several elements before it, then summing all elements behind it, and defining effective order determining threshold by the ratio of the two sums: if the determining threshold is lower than threshold value,setting adjacent element behind the reference element as a new reference element, continuing summing and determining a new effective order determining threshold; and if higher than threshold value, the sequence number corresponding to the reference element is the effective order of the channel impulse response. And the invention can improve estimating performance of effective order of wireless channel impulse response.

Description

technical field [0001] The invention relates to a method for estimating the effective order of channel impulse response in a wireless communication system. In a wireless communication system based on OFDM (orthogonal frequency division multiplexing) technology, the time domain of LS (least squares) channel estimation algorithm is aimed at Combining the composition characteristics of the estimation results, combined with the characteristics of the wireless channel impulse response being a finite impulse response in the time domain, the energy detection is performed on the time domain results of the LS channel estimation algorithm, and the reverse search is carried out to obtain the channel effective order estimation value. The invention belongs to the technical field of wireless communication. Background technique [0002] The OFDM system utilizes FFT (Fast Fourier Transform) to complete modulation, demodulation and channel equalization in the frequency domain. The system us...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 何晨袁清升蒋铃鸽
Owner SHANGHAI JIAO TONG UNIV