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Frequency domain channel estimation method and system

A frequency-domain channel and frequency-domain signal technology, applied in the frequency-domain channel estimation method and system field, can solve problems such as the inability to obtain user channel estimation, and achieve the effect of reducing computational complexity and improving computational speed

Inactive Publication Date: 2010-03-31
ZTE CORP
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Problems solved by technology

This method performs channel estimation in the time domain, and the existing problem is that only one target user’s channel impulse response can be obtained at a time, when the pilots of multiple users completely occupy the same time-frequency resource, and these pilots are not completely orthogonal When , channel estimates for these users cannot be obtained

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  • Frequency domain channel estimation method and system
  • Frequency domain channel estimation method and system
  • Frequency domain channel estimation method and system

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0027] The main idea of ​​the present invention is: after the receiving end FFT transforms the received data into the frequency domain, extract the corresponding frequency domain pilot reception data on each antenna pilot subcarrier; The local pilots of a user to be processed are matched, that is, the received data of the frequency domain pilot on each antenna is matched with the local pilot of a user to be processed; the matching result is IFFT transformed into the time domain; different users are compared in the time domain After separating the related information, the FFT transformation is carried out to the frequency domain respectively; finally, the frequency-domain pilot channel estimates corresponding to all receiving antennas are obtained for different users. The invention effectively solves the problem of channel estimation perfo...

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Abstract

The invention discloses a frequency domain channel estimation method and system. The method includes that: S1, a receiving terminal carries out FFT conversion to convert the received data into frequency domain, and frequency domain data of pilot frequency of each antenna is extracted at corresponding carrier position of pilot frequency in frequency domain signal received by each antenna; S2, the frequency domain data of pilot frequency of each antenna is matched with local pilot frequency of any user to be processed; S3, the matched result is converted to time domain by IFFT conversion, and multi-user separation is carried out in time domain to obtain related information of time domain pilot frequency channel response of different user channels; S4, FFT conversion is carried out on the related information, the related information is converted to frequency domain, so as to obtain frequency domain pilot frequency channel estimation of different user channels corresponding to each receiving antenna. The invention can effectively separate each user when multiple user pilot frequency sequences occupy the same video resource, thus realizing accurate estimation of each user channel response.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a frequency domain channel estimation method and system. Background technique [0002] Channel estimation techniques in wireless communication technologies can be generally divided into three categories: blind estimation, non-blind estimation, and semi-blind estimation between the two. The traditional blind estimation method usually requires a large number of matrix operations, which has high complexity and large processing delay; the non-blind estimation method usually has relatively low complexity because it can make full use of the useful pilot information in the system, and can obtain better Therefore, it has been widely used in many current communication systems, and has become the direction that many scholars pay attention to. [0003] At present, there are many methods for channel estimation using pilots, such as the least square error (LS) algorithm and the mi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
Inventor 王雯芳刘巧艳
Owner ZTE CORP
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