Implement method and device of channel estimation

A technology of channel estimation and implementation method, which is applied in the field of communication and can solve problems such as channel estimation performance degradation

Inactive Publication Date: 2010-05-05
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

[0022] Aiming at the problem in the related art that channel estimation cannot adapt to changes in the actual environment due to the use of fixed filter coefficients, the performance of channel estimation is degraded. Accuracy of Channel Estimation

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  • Implement method and device of channel estimation
  • Implement method and device of channel estimation
  • Implement method and device of channel estimation

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Embodiment Construction

[0067] Aiming at the problem in the related art that channel estimation cannot adapt to changes in the actual environment due to fixed filter coefficients, the present invention proposes to convert the channel estimation results of the RS into the time domain, and then perform The time-domain channel impulse response sequence is obtained by weighting, and then the power delay spectrum of the RS is obtained, and the frequency-domain correlation function of the RS is obtained according to the power delay spectrum. Based on the frequency-domain correlation function, time-domain interpolation and frequency-domain interpolation are performed to obtain the final channel The estimation result makes the frequency domain correlation function and the filter coefficient correlate with the actual RS, so that the channel estimation can adapt to different actual situations, and effectively improve the performance and accuracy of the channel estimation.

[0068] Embodiments of the present inv...

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Abstract

The invention discloses an implement method and a device of channel estimation. The method comprises the following steps: converting the extracted channel estimation result of the reference signal to time domain to obtain the time domain initial channel estimation sequence of the reference signal; weighing the time domain initial channel estimation sequence to obtain the time domain channel shock response sequence of the reference signal; obtaining the power delay spectrum of the reference signal according to the time domain channel shock response sequence, and obtaining the relevant function of the frequency domain of the reference signal according to the power delay spectrum; and carrying out normalization treatment on the relevant function of the frequency domain, and carrying out Wiener filtering calculation according to the normalized relevant function of frequency domain to obtain the final channel estimation results. In the invention, corresponding Wiener filtering coefficient can be obtained according to the real situation of RS, thus ensuring that the channel estimation process can be better carried out based on RS, avoiding the problem that the channel estimation process does not fit for the change of the actual environment due to the adoption of fixed Wiener filtering coefficient, and being capable of effectively improving the performance and accuracy of channel estimation.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for realizing channel estimation. Background technique [0002] The broadband wireless communication adopted in the downlink technology of the basic transmission technology of the Long Term Evolution (LTE) standard, the next generation wireless standard of the 3rd Generation Partnership Project (abbreviated as 3GPP). Orthogonal Frequency Division Multiplexing (OFDM for short) is the preferred technology. The OFDM technology has high spectral efficiency and good anti-multipath interference capability. In downlink receiver design, channel estimation technology is a key technology to improve system performance. [0003] Usually, LTE downlink channel estimation is performed based on a frequency-domain reference signal (Reference Signal, referred to as RS), and the RS is regularly distributed on specific subcarriers in the time domain and frequency domain. figur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 钟伟
Owner ST ERICSSON SEMICON BEIJING
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