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Channel estimation method in orthogonal frequency division multiple access system

An orthogonal frequency division multiple access and channel estimation technology, which is applied in the field of channel estimation, can solve problems such as the limitation of the application range of channel estimation schemes, and achieve the effect of accurate channel frequency domain transmission matrix

Active Publication Date: 2012-11-21
HUAWEI TECH CO LTD
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Problems solved by technology

[0010] Embodiments of the present invention provide a channel estimation method and device in an OFDMA system to solve the problem that the application range of the channel estimation scheme in the prior art is limited

Method used

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  • Channel estimation method in orthogonal frequency division multiple access system
  • Channel estimation method in orthogonal frequency division multiple access system
  • Channel estimation method in orthogonal frequency division multiple access system

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Embodiment 1

[0026] Taking the PUSC (Partially Used Sub-channel) sub-channel of the uplink under the IEEE802.16e OFDMA system as an example, the processing flow of the method for channel estimation of the OFDMA system provided by the embodiment of the present invention is as follows: figure 2 As shown, including the following processing steps:

[0027] Step 21: Obtain the linear change characteristics of the channel within the time domain interval of one pilot, and calculate the estimated value at the pilot point p on the main diagonal of the frequency domain transmission matrix.

[0028] The OFDMA system divides the channel into many orthogonal sub-channels, and performs narrow-band modulation and transmission on each sub-channel, thus reducing the mutual interference between the sub-channels and improving the spectrum utilization rate.

[0029] The sub-channels of the IEEE802.16e OFDMA system have a time-frequency block structure. There are 4 sub-carriers in the frequency domain in a block doma...

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Abstract

The invention provides a channel estimation method and a channel estimation device in an orthogonal frequency division multiple access system. The method mainly comprises the following steps: acquiring time-varying information of a frequency domain transmission function of each subcarrier in a sub-channel through linear interpolation processing according to an estimation value of a main diagonal element of a frequency domain transmission matrix of the sub-channel, wherein the sub-channel linearly changes in a time frequency interval of a pilot frequency; and converting the time-varying information of the frequency domain transmission function of each subcarrier in the sub-channel according to a predetermined conversion relation to obtain estimation values of all elements in the frequency domain transmission matrix of the sub-channel. The method and the device can effectively estimate disturbance among the sub-carriers according to time variation of a time-varying frequency domain response function of a tracking channel of a linear model within a symbol in a frequency domain so as to acquire a relatively accurate channel frequency domain transmission matrix.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, and in particular to a channel estimation method in an OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access) system. Background technique [0002] In recent years, broadband wireless technology has developed rapidly. The broadband wireless access technology WiMAX (Worldwide Interoperability for Microwave Access) based on IEEE (Institute of Electrical and Electronics Engineers) 802.16 series standards has gradually become the focus of the wireless communications industry. focus. [0003] The physical layers of IEEE802.16d and 802.16e both use OFDMA technology. For the OFDM transmission system, the acquisition of CSI (Channel State Information, channel state information) plays a key role in data detection and equalization. [0004] Under the condition of high-speed movement of the terminal, the channel response function of the multipat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 李丹冯穗力叶梧庄宏成
Owner HUAWEI TECH CO LTD
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