Channel estimation method for Orthogonal Frequency Division Multiplexing system and device thereof

A channel estimation and orthogonal frequency division technology, applied in channel estimation, multi-frequency code system, baseband system, etc., can solve the problems of low channel estimation accuracy and affecting data demodulation effect, etc.

Inactive Publication Date: 2009-09-16
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

[0005] In actual application scenarios, channel conditions vary greatly, but the existing technology uses a fixed interpolation method to deal with all channel conditions, which leads to low accuracy of channel estimation and affects the demodulation effect of data

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  • Channel estimation method for Orthogonal Frequency Division Multiplexing system and device thereof
  • Channel estimation method for Orthogonal Frequency Division Multiplexing system and device thereof
  • Channel estimation method for Orthogonal Frequency Division Multiplexing system and device thereof

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Embodiment Construction

[0069] The key of the embodiments of the present invention is to adaptively calculate frequency-domain interpolation coefficients for channel estimation according to the corresponding relationship between channel delay extension and coherence bandwidth; and adaptively calculate time-domain interpolation coefficients in channel estimation according to coherence time.

[0070] The so-called channel delay extension refers to the different propagation paths experienced by the various path components of the channel, so they have different time delays, which makes the energy of the signal extended in time. The so-called coherent bandwidth refers to a frequency-domain bandwidth within which the amplitude-frequency of the received signal has a strong correlation, that is, the amplitude-frequency response of the channel remains basically unchanged within the coherent bandwidth. There is a strong correspondence between the channel delay spread and the coherent bandwidth, the greater the ...

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Abstract

The invention provides a channel estimation method for Orthogonal Frequency Division Multiplexing system and a device thereof. The channel estimation method comprises the following steps: A. calculating according to the frequency domain channel estimation of a reference signal to obtain the delay spread of the channel; B. generating a frequency domain interpolation coefficient according to the delay spread; C. carrying out interpolation according to the frequency domain interpolation coefficient and the frequency domain channel estimation of the reference signal to obtain the channel estimation of the whole frequency of the position where the reference signal is located; D. calculating according to the frequency domain channel estimation at different time domain positions to obtain the coherence time of the channel; E. generating a time domain interpolation coefficient according to the coherence time; and F. carrying out interpolation according to the time domain interpolation coefficient and the channel estimation of the whole frequency located with the range of the coherence time to obtain the whole channel estimation of the time domain and the frequency domain. In light of the invention, the channel estimation result can self-adaptively change with the change of the channel.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a channel estimation method and device for an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] In the long-term evolution (LTE) wireless communication system, OFDM is its core physical layer technology. It modulates the data stream on multiple orthogonal sub-carriers, and the frequency spectrum between the orthogonal sub-carriers can overlap, thus greatly improving the spectrum utilization. [0003] refer to figure 1 , in an OFDM system, the transmitted information can be described by a resource grid, which expresses the resources in the entire time domain and frequency domain in the form of resource elements (RE, Resource Element), namely figure 1 A minimum square in , which corresponds to the time length of one subcarrier in the frequency domain and one symbol in the time domain. All information that needs to be transmitt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/0204H04L25/0212H04L25/0232
Inventor 许百成牟秀红冯心睿
Owner ST ERICSSON SEMICON BEIJING
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