Calculation Method of Doppler Power Spectrum of High-speed Railway Wireless Channel Based on Scattering Characteristics

Abstract

The invention provides a calculation method of a high-speed railway wireless channel Doppler power spectrum based on a scattering characteristic. The method comprises the following steps: partitioning a wireless channel in a high-speed railway scattering scene into a very-weak scattering field, a weak scattering field, a strong scattering field and a very-strong scattering field according to weights of scattering components included in a received signal; determining a number of lines of sight and a number of not lines of sight in the received signal; and calculating the Doppler power spectrum of a high-speed railway mobile end according to different scenes. Through adoption of the method, a number of distinguishable lines of sight and a number of distinguishable not lines of sight in the received signal at a certain moment can be described accurately during running of a high-speed railway in different scattering scenes; high-speed railway wireless channel characteristics are represented accurately in more detail through classification and quantization of the scattering scenes; research of a high-speed railway statistics channel model in a three-dimensional space is extended; the accuracy of a channel parameter simulation experiment is increased; and an effective solution is provided for ultrahigh-speed wireless access and high-speed railway networking of a future fifth-generation (5G) mobile communication system.

Description

technical field [0001] The invention relates to the field of wireless communication signal processing, in particular to a method for calculating the Doppler power spectrum of a high-speed rail wireless channel based on scattering characteristics. Background technique [0002] In recent years, the development of my country's high-speed rail has attracted worldwide attention, and the communication between high-speed rail trains and ground has become a current research hotspot. The development of broadband wireless communication systems that meet the broadband data services of high-speed rail passengers and the detection data transmission for operational safety has become an important issue in both academia and industry. According to the consensus of the industry, high-speed rail broadband wireless access supporting the fifth generation (5G) mobile communication system has become a key issue that needs to be solved urgently. The Doppler frequency shift and fast fading caused by ...

AI Technical Summary

Problems solved by technology

[0003] The study of wireless channel characteristics under ultra-high-speed mobile conditions is the basis for the development of new multimedia communication systems for high-speed rail in the future. Communication links often have a strong line of sight (LOS, line of sight), and there are different degrees of scattering components in different scattering scenarios; (3) High-speed movement often leads to drastic changes in Doppler frequency shift, resulting in large frequency deviation, which will seriously affect the communication quality of the user terminal

[0004] However, in the current wireless channel modeling process of high-speed rail, the uniform or non-uniform distribution models of scatterers are mostly limited to indoor or outdoor medium and low-speed moving scenarios, and the influence of high-speed moving on channel parameter estimation is rarely considered. At the same time, in order to simplify the model The influence of the physical properties of the scatterer itself on the channel coefficient is ignored, which also increases the channel modeling error to a certain extent, especially for the wireless channel model in the high-speed mobile environment, which is basically powerless, and lacks a reasonable physical explanation for the channel assumption.

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