A Smart Surface-Assisted Spatial Modulation Antenna Selection Method in High-Speed ​​Rail Scenario

Abstract

The invention discloses a space modulation antenna selection method assisted by an intelligent surface in a high-speed rail scene, belonging to the field of rail transit wireless communication. The method includes the following steps: firstly, the spatial modulation system assisted by the smart surface in the high-speed rail scene is given; then, the angle of arrival is estimated by using the pilot signal, and the phase of each reflection unit of the smart surface is adjusted according to the estimated value, and at the same time based on the maximum received signal The noise ratio is used to filter the spatial modulation index antenna; finally, according to the current position and speed direction of the train, the phase of each unit of the smart surface is further adjusted to eliminate the Doppler frequency shift, and the effective antenna unit of the smart surface is selected based on the maximum receiving complex envelope. The present invention jointly screens the receiving index antenna and the effective antenna unit of the intelligent surface, while eliminating the multipath scattering Doppler frequency shift, and maximizing the receiving signal-to-noise ratio, thereby improving the spectrum efficiency and bit error rate of the system.

Description

technical field [0001] The invention relates to the technical field of wireless communication, and considers a method for selecting a space modulation antenna based on an intelligent surface assistance in a high-speed rail scene. Background technique [0002] With the rapid development of high-speed railways and the standardized commercialization of 5G technology, in order to strengthen the green and efficient comparative advantages of high-speed railways and achieve convenient, comfortable and high-quality services, the application of 5G-related technologies in railway mobile communication systems will comprehensively improve the efficiency of railway transportation and passenger transport. service quality. [0003] The communication environment of high-speed rail lines is rich, the number of multipaths is small, and the line-of-sight characteristics are obvious. At the same time, high-speed mobility brings large Doppler frequency shift and delay extension, and chain covera...

AI Technical Summary

Problems solved by technology

[0003] The communication environment of high-speed rail lines is rich, the number of multipaths is small, and the line-of-sight characteristics are obvious. At the same time, high-speed mobility brings large Doppler frequency shift and delay extension, and chain coverage leads to frequent cell switching, which will cause High drop rate and communication interruption

As a special MIMO technology, spatial modulation takes a different approach. It can be used to overcome the strong space-time correlation of high-speed rail channels by using its unique antenna switching characteristics and modulation index. However, the multipath fading caused by Doppler frequency shift can only Relying on the transmitter for compensation, this requires a more suitable high-speed rail wireless communication technology solution to reduce the impact of Doppler frequency shift and improve communication service quality

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