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Channel estimation method of frequency domain filtering mobile WiMAX (world interoperability for microwave access) downlink system based on singular value decomposition

A singular value decomposition and frequency domain filtering technology, applied in the direction of multi-frequency code system, baseband system components, etc., can solve the problem of channel estimation edge effect, etc., to achieve the effect of reducing edge effect, high estimation accuracy, and simple execution

Inactive Publication Date: 2011-07-06
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a channel estimation method for mobile WiMAX downlink system based on singular value decomposition frequency domain filtering, so as to avoid constructing VCFR, simplify the channel estimation process, and solve the problem of serious "edge effect" in channel estimation

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  • Channel estimation method of frequency domain filtering mobile WiMAX (world interoperability for microwave access) downlink system based on singular value decomposition
  • Channel estimation method of frequency domain filtering mobile WiMAX (world interoperability for microwave access) downlink system based on singular value decomposition
  • Channel estimation method of frequency domain filtering mobile WiMAX (world interoperability for microwave access) downlink system based on singular value decomposition

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[0023] The method of the present invention reduces the influence of noise in the frequency domain least squares channel estimation by using frequency domain filtering, and selects some large singular values ​​by decomposing the singular value of the frequency domain filter and performing threshold judgment to reduce the symbol structure and subcarrier allocation The "edge effect" problem caused by the uneven distribution of pilot subcarriers caused by the scheme. The present invention first uses the least squares estimation method in the frequency domain to obtain the channel frequency response estimation at the actual allocation of pilot symbol subcarriers in each OFDM symbol between the transceiver antennas; then, each OFDM The channel frequency response estimation of the multiplexed OFDM symbols at the subcarriers of adjacent OFDM symbols is obtained by linear interpolation of the channel frequency responses at the corresponding subcarriers of adjacent OFDM symbols; Combine...

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Abstract

The invention relates to a channel estimation method of a frequency domain filtering mobile WiMAX (world interoperability for microwave access) downlink system based on singular value decomposition, which comprises the following steps: using the least-square estimation method to get channel frequency response estimation of an actually distributed pilot symbol subcarrier in each OFDM (orthogonal frequency division multiplexing) symbol; getting the channel frequency response estimation of the subcarriers of the adjacent OFDM symbols by channel frequency response linear interpolation in the corresponding subcarriers in the adjacent OFDM symbols; merging the actual pilot subcarriers with the channel frequency response estimation got by linear interpolation, arranging index values of all the subcarriers in an ascending order, and then sending into a frequency domain filter for denoising after judging a singular value threshold; and finally re-utilizing the linear interpolation to get the final channel frequency response estimation of all the data subcarriers. By using the frequency domain filter, the impacts of noise in a frequency domain least-square channel estimator can be reduced; by performing the judgment of the threshold based on the singular value decomposition on the frequency domain filter, the stability of frequency domain filtering is increased, and the problem of edge effect caused by non-uniform distribution of the pilot symbols is overcome.

Description

technical field [0001] The invention relates to a channel estimation method for a mobile WiMAX downlink system, in particular to a channel estimation method for a mobile WiMAX downlink system based on singular value decomposition frequency domain filtering, and belongs to the technical field of wireless communication. Background technique [0002] In recent years, broadband wireless technology has developed rapidly, and Wordwide Interoperability for Microware Access (WiMAX) has gradually become the focus of the wireless communication industry and has broad market prospects. WiMAX is a broadband wireless access technology based on IEEE 802.16 series standards, and supports four application scenarios: fixed, nomadic, portable and fully mobile. Among them, mobile WiMAX uses Orthogonal Frequency Division Multiple Access (OFDMA) in accordance with the air interface standard IEEE802.16e. A generation of wireless broadband technology. [0003] In the IEEE802.16e standard, each OF...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 王丹杨雷普杰信徐美玉徐迎曦
Owner HENAN UNIV OF SCI & TECH
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