Method for channel estimation

A channel estimation and channel impulse response technology, applied in the field of channel estimation, can solve the problems of implementation difficulty and high algorithm complexity, and achieve the effects of simplifying processing complexity, optimizing channel estimation, and eliminating inter-symbol interference.

Inactive Publication Date: 2009-02-11
TSINGHUA UNIV
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Problems solved by technology

Chinese invention patent 200510012127.6 "An Iterative Elimination Method for Pseudo-Random Sequence Filling in OFDM Modulation System" proposes an iterative decomposition method, which solves the problem of channel estimation and equalization, but the algorithm has high complexity and is difficult to implement

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  • Method for channel estimation
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Embodiment Construction

[0066] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0067] The present invention obtains more accurate channel estimation by reconstructing the linear convolution of the pseudo-random sequence of the current frame and the channel impulse response, and iterative processing, and further optimizes the channel estimation, thereby eliminating the intersymbol interference caused by the multipath channel, The pseudo-random sequence is separated from the data, and the processing complexity of channel estimation and equalization of multi-carrier and single-carrier transmission systems based on pseudo-random sequence filling is simplified.

[0068] Figure 10 The flow of the channel estimation method provided by the embodiment of the present invention is shown, specifically including the followin...

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Abstract

The invention discloses a channel estimation channel, which belongs to the technical field of digital information transmission. The method comprises the following steps: removing intersymbol interference and noise from linear convolution of data of the previous frame and channel impulse response to obtain novel linear convolution; calculating the pseudo random sequence of the current frame and the linear convolution for initial channel estimation; reconstructing the linear convolution of the current frame; respectively transforming the pseudo random sequence of the current frame and the reconstructed linear convolution; carrying out reverse transformation of the ratio after transformation to obtain novel channel estimation; and accumulating the iteration times, and using the novel channel estimation as the initial channel estimation for further iteration if the iteration times does not reach the preset maximal value, or else, setting the novel channel estimation as the final channel estimation. The channel estimation method can acquire more accurate channel estimation, eliminate intersymbol interference caused by multi-path channels and reduce the processing complexity for channel estimation and balance a of multi-carrier or single carrier transmission system based on pseudo random sequence filling.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a channel estimation method. Background technique [0002] The main problem to be solved in the current communication technology is how to increase the transmission rate reliably within the limited bandwidth. Due to the influence of the channel, especially the wireless channel is a time and frequency dual dispersion channel, the signal will be distorted and noise will be added, so while effectively transmitting the payload or data part, the system should also be able to identify the change of the channel, and take action accordingly. offset or compensate. In addition, the receiving end also needs to perform clock recovery, carrier recovery and channel estimation on the received signal. In a complex transmission environment, in order to ensure the reliability and efficiency of the communication system, the method usually adopted by the communication syst...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B17/00H04L27/26H04L25/02
Inventor 王军杨昉杨知行王劲涛付剑潘长勇宋健
Owner TSINGHUA UNIV
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