Research Article
Doppler Shift Effect with Non-Orthogonal Multiple Access Technology for 5G System
@INPROCEEDINGS{10.4108/eai.7-9-2021.2314871, author={Roaa Ali Hussein and Saad Ahmed Ayoob}, title={Doppler Shift Effect with Non-Orthogonal Multiple Access Technology for 5G System}, proceedings={Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9 September 2021, Sakarya, Turkey}, publisher={EAI}, proceedings_a={IMDC-IST}, year={2022}, month={1}, keywords={5g noma mimo doppler effect ues velocity}, doi={10.4108/eai.7-9-2021.2314871} }- Roaa Ali Hussein
Saad Ahmed Ayoob
Year: 2022
Doppler Shift Effect with Non-Orthogonal Multiple Access Technology for 5G System
IMDC-IST
EAI
DOI: 10.4108/eai.7-9-2021.2314871
Abstract
Non-orthogonal multiple access (NOMA) is a 5G wireless connectivity technology. It aims to improve user (UE) service at cell edge (CE) by pairing with the UE at the cell centre (CC). User velocity is an important component of 5G communication systems. This paper investigates the presence of a Doppler shift effect (DSE) for the movement of a user in a NOMA cell. Also, the emphasis in this search is on DSE for users (UEs) at the CC and the user’s velocity at 180km/h. The method used for the simulation, Link (LL) Level emulator for Vienna 5G. Through the NOMA principle, the results demonstrate that DSE was evident on the UE in centre of the cellular network. When changing the user’s speed from 0 to 180 km/h, the user's efficiency changed from 4.937 Mbit/s to 0.6418 Mbit/s at transmitted Power of eNB equal 25dBm. In another expression, due to an increase in the UE's speed and DSE, the user's throughput decreases by nine times his efficiency at speed = 0 km / h. By increasing the number of eNB antennas, MIMO (8X2) has achieved 4 times better user efficiency improvement than MIMO (2X2). The number of UE antennas is increased antennas to four and changing number of eNB antennas, MIMO (2X4) enables to maintain user's throughput at high speed and DSE. In this type of MIMO, the user's efficiency has reached a result close to that of UE when his motion is stationary.
