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Method and device for eliminating multi-symbol subcarrier jamming and performing channel estimation jointly

A technology for joint channel estimation and interference cancellation, applied in the field of channel modeling under time-varying channels

Inactive Publication Date: 2012-11-14
ZTE CORP
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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-symbol subcarrier interference elimination joint channel estimation method and device, which can better solve the problems of reducing channel estimation overhead and eliminating intersubcarrier interference in OFDM

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  • Method and device for eliminating multi-symbol subcarrier jamming and performing channel estimation jointly
  • Method and device for eliminating multi-symbol subcarrier jamming and performing channel estimation jointly
  • Method and device for eliminating multi-symbol subcarrier jamming and performing channel estimation jointly

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Embodiment Construction

[0039] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0040] figure 1 It is a flow chart of the multi-symbol subcarrier interference cancellation joint channel estimation method provided by the embodiment of the present invention, as shown in figure 1 shown. In this embodiment, the characteristics of the time-domain model of the linear time-varying multipath channel are described first, and then the ICI cancellation joint channel estimation method of the present invention is described based on the model.

[0041] The present invention utilizes the normalized Doppler frequency offset f N When ≤0.1, the multipath channel taps of the time-varying multipath channel satisfy the condition of linear change within...

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Abstract

The invention discloses a method and a device for eliminating multi-symbol subcarrier jamming and performing channel estimation jointly. The method comprises the following steps of: obtaining a slope matrix of a multipath channel by utilizing two pilot frequency data successively received on a same subcarrier; obtaining a nodal increment matrix of the multipath channel by utilizing the pilot frequency subjected to slope matrix removal; and determining a time-domain model of the multipath channel for channel estimation by utilizing the slope matrix and the nodal increment matrix. According to the method, the time-domain model of the multipath channel is established, so that the frequency response of each subcarrier channel can be accurately obtained, and the subcarrier jamming can be effectively eliminated.

Description

technical field [0001] The invention relates to a channel modeling method under a time-varying channel, in particular to a multi-symbol sub-carrier interference elimination joint channel estimation method and a related device. Background technique [0002] Orthogonal Frequency-Division Multiplexing (OFDM) is a special multi-carrier modulation technology that converts high-speed data streams into low-speed parallel data streams and modulates them into mutually orthogonal subcarriers through serial-to-parallel conversion. Therefore, the duration of each symbol increases. By adding a cyclic prefix (Cyclic Prefix-CP), the linear convolution of the signal and the channel can be converted into a circular convolution. The receiving end uses a first-order frequency domain equalizer , to eliminate inter-symbol interference (Inter-Symbol Interference-ISI). From the perspective of frequency domain, since the subcarrier spacing in OFDM is smaller than the coherent bandwidth of the chan...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 刘留邱家慧王海波张学林江海秦洪峰李萍魏继东
Owner ZTE CORP
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