Aviation communication system base extension channel estimation method based on prior time delay information

Abstract

The invention discloses an aviation communication system base extension channel estimation method based on prior time delay information, and the method comprises the following steps: expressing a to-be-estimated channel impulse response as a product of a base function and a base coefficient through a time-varying channel estimation model based on base extension, and carrying out the vectorizationoperation; performing Fourier transform to obtain a frequency domain channel impulse response matrix H, and substituting the frequency domain channel impulse response matrix H into a formula for performing Fourier transform on a time domain receiving signal to obtain a new receiving signal; decomposing the new receiving signal into a pilot frequency part and a data part, and simplifying the same;obtaining a pilot frequency data matrix according to simplification; synthesizing all the observation intervals to obtain a received signal; estimating the received signal to obtain channel estimation; estimating channel time delay by utilizing prior time delay information according to the received signal to obtain a distinguishable multipath number of the channel, further obtaining a pilot frequency data matrix, and then obtaining a primary function coefficient matrix; substituting the primary function coefficient matrix into the estimation module subjected to the vectorization operation, andperforming de-vectorization to obtain a channel impulse response matrix; and finally obtaining a channel impulse response matrix. According to the invention, huge Doppler frequency shift caused by ultra-high-speed flight can be overcome, and high-speed data transmission is realized.

Description

technical field [0001] The present invention relates to the technical field of aeronautical communication, and more specifically, relates to a method for estimating a basic extended channel of an aeronautical communication system based on priori time delay information. Background technique [0002] With the development of aviation vehicles such as UAVs, aviation communication, which is one of the key technologies in the aviation field, has received extensive attention. In the aeronautical communication system, the main technical difficulty lies in how to overcome the huge Doppler frequency shift brought about by ultra-high-speed flight, so as to realize high-speed data transmission. In addition, the large time delay of aviation channels also brings great challenges to channel estimation. [0003] The existing algorithms for channel estimation in aeronautical communication systems can be mainly divided into two aspects. On the one hand, the typical channel of aviation commu...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem that the existing technology cannot overcome the huge Doppler frequency shift brought by ultra-high-speed flight, and thus cannot realize high-speed data transmission, the present invention proposes an aeronautical communication system channel estimation method based on priori delay information, This method can overcome the huge Doppler frequency shift brought by ultra-high-speed flight and realize high-speed data transmission

Images