Performance analysis based on simulation of 5G under ultra-high-speed mobile conditions

Research significance of performance analysis of wireless communication systems in
high-speed mobile scenarios compared with the public mobile communication scenario,
the railway dedicated mobile communication scenario faces important challenges such
as faster wireless channel time and high electromagnetic wave penetration loss.
First of all, the Doppler effect caused by the high-speed train movement will cause fast
channel fading and affect the overall communication performance. Secondly, the
abundant scattering objects around the train track, such as trains, buildings, trees, etc.,
will also cause the multipath propagation of radio waves, which causes the signal
received by the receiver to be the superposition of the propagation signals of multiple
paths, resulting in the channel frequency domain the non-flat characteristics. Under the
conditions of high-speed and ultra-high-speed movement (greater than 500km/h) of
trains, the fast time-varying characteristics of the channel will be more difficult, and
various indicators for evaluating channel performance, such as throughput and bit error
rate, will deteriorate rapidly.
2. Key parameters of wireless channels in high-speed mobile scenarios radio waves
experience three main types of attenuation during propagation: path loss, shadow
fading, and small-scale fading. Therefore, some wireless channel parameters are
needed to characterize radio wave propagation, such as path loss, delay spread, and K
factor. At the same time, in order to accurately evaluate the performance of the
communication system, it is necessary to use reasonable parameters for system
performance evaluation, such as throughput, signal-to-noise ratio, and bit error rate.
Therefore, in-depth research and analysis of the large-scale fading characteristics and
small-scale fading characteristics that affect the performance of wireless
communication, and the study of their internal relations with communication system
performance indicators are of great significance for analyzing the impact of fastchanging wireless channels on the performance of communication systems.
3. 5G NR key technologies and communication system performance evaluation
parameters 5G can support mobile communications with a maximum speed of 500km/h.
The performance of some key technologies will be severely affected in high-speed
mobile scenarios. Therefore, some major technologies in 5G NR will be studied,
including frame structure, F-OFDM, LDPC and other technologies. At the same time,
the specific calculation method of wireless communication performance evaluation
parameters (signal-to-noise ratio, throughput, bit error rate) under F-OFDM and
Numerology frame structure technology is given.
4. Simulation and analysis of wireless communication system performance in high-speed
mobile scenarios based on Vienna 5G simulation platform the Vienna 5G Link Level
simulator is better compatible with LTE and 5G systems through programming at the
physical layer, and meets the simulation requirements of LTE to 5G evolution. Conduct