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Method and device for channel estimation

A channel estimation and channel technology, applied in the field of channel estimation, can solve the problems of channel tap energy leakage and inaccurate channel estimation, and achieve the effects of accurate results, accurate filtering coefficients, and accurate frequency domain filtering.

Active Publication Date: 2013-06-19
LEADCORE TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0022] In order to solve the problem in the prior art that the channel taps are not necessarily at integer multiple sampling points, which will cause energy leakage of the channel taps, resulting in inaccurate channel estimation, an embodiment of the present invention provides a method and device for channel estimation

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Embodiment 1

[0044] Before introducing the embodiment of the present invention, first introduce the new channel delay power spectrum proposed by the embodiment of the present invention,

[0045] θ ( τ m ) = 1 / L 0 τ m ∈ [ - τ leak , L 0 - τ leak ] 0 otherwise ...

Embodiment 2

[0054] An embodiment of the present invention provides a channel estimation method, such as Figure 5 shown, including:

[0055] S1. Perform initial channel estimation LS according to the reference signal RS, and estimate the frequency domain response of the channel at the reference signal

[0056] S2. Calculate the frequency domain response The amount of phase rotation θ is required, where the calculation method of the amount of phase rotation θ is:

[0057] θ = τ A + τ max 2 - τ leak ,

[0058] In the above formula, τ leak is the leakage value of the channel tap caused by non-integer multiple sampling, which is related to the frequency of sampling, and the specific value is obtained by simulation; τ A is the sampling point received in advance; τ max is the estimated value of th...

Embodiment 3

[0073] The embodiment of the present invention also provides a channel estimation device, such as Figure 8 shown, including:

[0074] The initial channel estimation unit 801 is configured to perform initial channel estimation on the reference signal, and estimate the frequency domain response of the channel at the reference signal

[0075] Phase rotation unit 803, used to calculate the The amount θ that needs to be phase rotated, and the Perform theta phase rotation;

[0076] An interpolation filtering unit 805, configured to, according to the correlation between each subcarrier, perform the θ phase rotation on the Perform interpolation and filtering;

[0077] The phase derotation unit 807 is configured to perform θ phase derotation on the interpolated and filtered values ​​to obtain the channel estimation value of the reference signal.

[0078] The channel estimation device provided by the embodiment of the present invention considers the influence of the energy le...

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Abstract

The invention provides a method and a device for channel estimation. The method comprises the following steps: carrying out initial channel estimation on reference signals, estimating the amount theta of phase rotation needed by frequency domain response calculation of a channel on the positions of the reference signals, and carrying out theta phase rotation; according to relevance of each subcarrier, carrying out interpolation and filtering after theta phase rotation; and carrying out theta phase unwrapping rotation on a value after interpolation and filtering, and obtaining a channel estimation value of the reference signals. According to the method and the device for channel estimation, influence of channel tapping energy leakage caused by non-integral-multiple sampling on frequency domain filtering is considered during channel estimation, and therefore frequency domain filtering is accurate. Meanwhile, when a filter coefficient is calculated, influence of receiving in advance is considered, and therefore the filter coefficient is accurate. Thus, estimation results of the reference signals are accurate.

Description

technical field [0001] The present invention relates to the communication field, in particular to a channel estimation method and device. Background technique [0002] In an Orthogonal Frequency Division Multiplexing (OFDM) system, a Reference Signal (RS) discretely inserted in the time-frequency domain is usually used for channel estimation. The typical one is to use two-dimensional linear minimum mean square error (Linear Minimum Mean Square Error, LMMSE) channel estimation, that is, after the initial channel estimation at RS, the minimum mean square error (Minimum Mean Square Error, MMSE) filtering and interpolation to obtain the channel estimate at the data position. [0003] Taking the Long Term Evolution (LTE) system as an example, the distribution of reference signals in the time-frequency domain is as follows: figure 1 As shown in , where the square with shaded background corresponds to the RS signal. [0004] When using the MMSE interpolation algorithm, it is nec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 康国庆廖伟邓瑞楠
Owner LEADCORE TECH
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