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Simplified BEM channel estimation method for high-speed mobile SC-FDMA system

A SC-FDMA, high-speed mobile technology, applied in channel estimation, baseband system components, etc., can solve problems such as difficult implementation, high computational complexity, and low estimation accuracy

Active Publication Date: 2017-09-29
XIDIAN UNIV
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Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the existing channel estimation methods have low estimation accuracy, high computational complexity, and are not easy to implement

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  • Simplified BEM channel estimation method for high-speed mobile SC-FDMA system

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Embodiment Construction

[0074] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0075] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0076] Such as figure 1 As shown, the simplified BEM channel estimation method of the high-speed mobile SC-FDMA system provided by the embodiment of the present invention includes the following steps:

[0077] S101: Calculate the matrix of the pilot symbols in the transform domain through the local pilot symbols;

[0078] S102: Obtain a basis function matrix and a frequency domain matrix of the basis functions based on the complex exponential basis extension model;

[0079] S103: P...

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Abstract

The invention belongs to the field of wireless communication technology, and discloses a simplified BEM channel estimation method for a high-speed mobile SC-FDMA system. The method comprises the following steps: calculating and storing a matrix required to estimate base coefficients in advance, and estimating the base coefficients; and deducing a mathematical relationship between the base coefficients and a frequency domain channel response matrix by using the channel characteristics and the transformation relation of time domain-frequency domain, and estimating a frequency domain channel response of received signals. According to the method disclosed by the invention, a complex exponential basis expansion model with the minimum model error is selected, the number of optimal basis functions is determined, and thus the estimation accuracy can be increased; a frequency domain matrix for estimating the base coefficients is calculated and stored in advance, and the calculation complexity can be reduced; and the mathematical relationship between the base coefficients and the frequency domain channel response matrix is deduced by adopting the time-frequency domain characteristics of a channel, the time-frequency domain conversion process of the channel with higher calculation complexity can be avoided, and the process that a receiver performs frequency-domain equalization processing for the received signals can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a simplified BEM channel estimation method, which is applicable to a SC-FDMA system of single carrier frequency division multiple access under high-speed movement. Background technique [0002] In broadband wireless communication, when the two communication terminals move at a relatively fast speed, the Doppler effect occurs, and the wireless channel forms a fast time-varying channel. The inter-subcarrier interference ICI caused by the fast time-varying channel and the inter-symbol interference ISI caused by the multipath effect will cause the rapid deterioration of SC-FDMA system performance. Therefore, it is very necessary to dynamically estimate the channel before demodulating and decoding the signal at the receiving end of the signal. Most of the existing channel estimation methods are based on pilot-aided, known pilot information is periodically i...

Claims

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Application Information

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IPC IPC(8): H04L25/02
CPCH04L25/0202H04L25/022
Inventor 宫丰奎姚翠翠张南陈翔
Owner XIDIAN UNIV
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