Calculation method of high-speed railway wireless channel Doppler power spectrum based on scattering characteristic

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 ...

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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 This will seriously affect the communication quality of the user terminal

[0004] However, in the current wireless channel modeling process of high-speed rai

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