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Method and device for estimating channel

A channel estimation and channel technology, applied in the baseband system components, multi-frequency code system, etc., can solve the problems of high computational complexity, poor channel estimation, and low system performance, so as to ensure the performance of channel estimation and reduce the complexity of system operation Degree, improve the effect of system performance

Inactive Publication Date: 2010-08-04
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

However, due to the use of fixed coefficients, channel estimation cannot be performed adaptively. In some channel environments, the channel estimation may be poor due to model mismatch, and the system performance is low.
[0008] In the prior art, frequency-domain channel estimation based on PDP (Power Delay Profile, power delay profile) adaptive Wiener filter can also be used, and the performance of frequency-domain channel estimation using an adaptive Wiener filter is relatively high, however, Due to the need to update the filter coefficients in real time, its computational complexity is also relatively high

Method used

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  • Method and device for estimating channel
  • Method and device for estimating channel

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Embodiment Construction

[0073] Before describing the embodiments of the present invention, firstly, the definitions of operation symbols and variables used in the embodiments of the present invention are briefly described.

[0074] 1. Operation symbols are defined as follows:

[0075] FFT( ) Fast Fourier Transform

[0076] IFFT( ) Fast Inverse Fourier Transform

[0077] RE(·) Signal real part operation

[0078] max{} takes the maximum value of the sequence

[0079] *min{} Take the minimum value of the sequence

[0080] * Find the convolution operator

[0081] 2. Variables are defined as follows:

[0082] N filter order

[0083] L frequency domain interpolation multiple

[0084] M Interpolated intersymbol distance in time domain

[0085] Dpass filter passband ripple index

[0086] Dstop filter stopband attenuation index

[0087] f c filter cutoff frequency

[0088] K 0 Frequency Domain Interpolation Filter Input Sequence Length

[0089] test(k) training sequence i...

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Abstract

The invention provides a method and the device for estimating a channel. The method comprises the following steps of: acquiring channel rough estimation at the position of a reference signal; acquiring multipath delay estimation of the channel rough estimation at the position of the reference signal in a time domain, and determining limiting frequency of a frequency domain interpolation filter needing to be adopted according to the multipath delay estimation; selecting a first frequency domain interpolation filter corresponding to the limiting frequency from a stored frequency domain interpolation filter bank; and performing interpolation processing by adopting the channel rough estimation at the position of the reference signal of the first frequency domain interpolation filter and a time domain interpolation filter to acquire the channel estimation at the positions of all the resource particles. The method and the device greatly reduce computation complexity of a system on the premise of ensuring performance of channel estimation.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a channel estimation method and a channel estimation device. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) wireless communication system, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) is its core physical layer technology, which modulates the data stream on multiple orthogonal subcarriers On the other hand, the frequency spectrum between the orthogonal subcarriers can be overlapped, so that the spectrum utilization rate is greatly improved. [0003] refer to figure 1 , in an OFDM system, the transmitted signal can be described by a resource grid, which expresses the resources of the entire time domain and frequency domain in the form of resource elements (RE, Resource Element), and resource elements are figure 1 The smallest square in , which corresponds to the time length of one...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 唐治汛
Owner ST ERICSSON SEMICON BEIJING
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