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OFDM (Orthogonal Frequency Division Multiplexing) system channel estimation system and method based on graph signal method

A channel estimation and signal method technology, applied in the field of OFDM system channel estimation system, can solve the problem of inaccurate channel estimation value and the like

Active Publication Date: 2022-03-04
XI AN JIAOTONG UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of OFDM system channel estimation system and method based on graph signal method, to solve the problem in the prior art that the channel estimation value in the prior art is inaccurate

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  • OFDM (Orthogonal Frequency Division Multiplexing) system channel estimation system and method based on graph signal method
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  • OFDM (Orthogonal Frequency Division Multiplexing) system channel estimation system and method based on graph signal method

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Embodiment 1

[0147] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0148] In order to verify the estimation performance of the scheme proposed by the present invention, OFDM channel estimation is carried out under different moving speeds. One frame of OFDM has 14 symbols in total, and each symbol is modulated to 24 subcarrier numbers, respectively at a moving speed of 100km / h, 300km / h, 500km / h moving speed, use 16 equally spaced pilots for channel estimation. For each different moving speed scenario, the topological structure of the graph is designed according to the designed weighting method, and the sampling recovery is performed according to the method of maximizing the minimum eigenvalue.

[0149] figure 2 A schematic diagram showing the modeling of a time-frequency dual channel as a graph signal when v=300km / h, from figure 2 It can be seen that the topology is obtained under the weighted distance sc...

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Abstract

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) system channel estimation system and method based on a graph signal method. The method is a non-blind estimation algorithm based on pilot frequency, in the algorithm, each resource block of an OFDM time-frequency doubly selective channel with structural characteristics is regarded as a node of a graph signal, and the topological structure of the graph signal is not only determined by a space structure, but also influenced by time selective fading and frequency selective fading. Smoothness constraint is used for modeling, and a signal recovery problem is mathematically modeled into an optimization problem to be solved. Meanwhile, the pilot frequency position is designed by using a graph sampling method, and a better pilot frequency placement position is found out, so that the accuracy of channel estimation is improved.

Description

technical field [0001] The invention belongs to the technical field of graph signal processing, and in particular relates to an OFDM system channel estimation system and method based on a graph signal method. Background technique [0002] In traditional data transmission systems, the data transmission method is usually serial transmission, each symbol transmission occupies the entire frequency band, the channel spectrum of each carrier does not overlap with each other, and the frequency band utilization is low. However, in a multi-carrier system, when transmitting data symbols, the data stream to be transmitted is first divided into several groups of sub-data streams, and then data transmission is performed on these sub-data streams at the same time through a parallel transmission method. Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier digital communication technology suitable for high-speed data transmission. OFDM divides a given frequency band into mo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
CPCH04L25/024Y02D30/70
Inventor 李国兵何彬陈源张国梅
Owner XI AN JIAOTONG UNIV
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