Power Distribution Adjustment for Rate-Splitting Performance Improvement in MIMO Systems

The high requirements for supporting massive connectivity has required the next generation of wireless technology to be capable of using the resources more efficiently. Non-Orthogonal Multiple Access (NOMA), one of the multiple access techniques, has been researched to gain high spectral efficiency....

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Bibliographic Details
Main Authors: Saputri, Desti Madya, Kurniawan, Adit, Arifianto, Mohammad Sigit, Pramudita, Aloysius Adya, Vidyaningtyas, Hurianti
Format: Conference Proceeding
Language:English
Subjects:
Imperfect CSIT
Interference
MIMO
NOMA
Power distribution
RSMA
Simulation
Spectral efficiency
Transmitters
Wireless networks
Online Access:Request full text
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Summary:The high requirements for supporting massive connectivity has required the next generation of wireless technology to be capable of using the resources more efficiently. Non-Orthogonal Multiple Access (NOMA), one of the multiple access techniques, has been researched to gain high spectral efficiency. Multiple-Input Multiple-Output (MIMO), meanwhile, is an antenna technology that can increase the spectral efficiency of wireless networks. A combination of NOMA and MIMO is able to cope with an overloaded scenario. However, this benefit lies in the massive demand for accurate Channel State Information at Transmitter (CSIT). Imperfect CSIT can arise multiuser interference problems, a significant problem for wireless networks in MIMO technology. Another promising multiple access strategy, known as Rate-Splitting Multiple Access (RSMA), has been researched for interference management. This multiple access scheme is expected to have better interference management capabilities for being more adaptive to the level of interference. When combined with MIMO systems, RSMA can overcome the imperfect conditions of CSIT compared to Power-Domain NOMA and Space Division Multiple Access (SDMA). However, its performance on some user deployment conditions gives only a little sum rate enhancements. This paper proposes a multiple access technique using Rate-Splitting on a Multiuser MIMO system with power distribution adjustments. By controlling the distribution of power in spatial domain, we could maximize the rate region across multiple user deployments. This adjustment controlled the power distribution before sending data to the user in the downlink communication.
ISSN:2831-6983
DOI:10.1109/ICAIIC57133.2023.10066961