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

Title: Performance analysis based on simulation of 5G under ultra-high-speed mobile
conditions
1. 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
simulation research on the communication performance of LTE and 5G in high-speed
mobile high-speed rail scenarios, comprehensively consider the impact of simulation
models (WINNER II, 3GPP TR 38.901), path loss, and Doppler effect, and
quantitatively study its impact on the performance of wireless communication systems,
on this basis, further targeted improvement methods are proposed.
Some Key details
– Description and discussion of simulation methods.
– Discussion of 5G key technologies (discuss the content related to this thesis,
such as, the key steps of link-level simulation, the simulation method of link-level simulation,
the calculation of key parameters for link-level simulation.)
– Discussion of the 5G HSR (high speed railway) channel, especially the 3GPP channel
model on 5G。
– Results of the simulation, the authenticity of the content is to be verified; the curves of
the simulation need to be smooth.
-Discussion and comparison of the simulation results for each curve; lack of comparison.
– Discussion about the 5G network in high speed rail; Discuss the simulation, is it multi-user
simulation? Is it a single base station? Or multi-base station? the layout of the simulation
environment.
-The key technologies, should also include Polar code and LDPC.
-Define the center frequency in the simulation, the scenario of your simulation.
-Comparison of several scenarios? Or the comparison with LTE? The comparison of multiple
antennas etc.
-The simulation process.
-The theory needs to be focused on high-speed rail train-ground communication, the
characteristics of high-speed rail train-ground communication, 3GPP modeling methods and
parameters on high-speed channels, 5G frame structure, duplex mode, multi-antenna form, etc.