Max-Min Fairness Precoder Design for Rate-Splitting Multiple Access: Impact of Imperfect Channel Knowledge

Rate-splitting multiple access (RSMA) is a key enabling technology for beyond 5 G networks due to its robustness against imperfect channel knowledge. In this paper, we consider both the imperfect channel state information (CSI) at the receiver (CSIR) and imperfect CSI at the transmitter (CSIT) and p...

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Veröffentlicht in:IEEE transactions on vehicular technology Jg. 72; H. 1; S. 1 - 6
Hauptverfasser: Lee, Byungju, Shin, Wonjae
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.01.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Algorithms
Channel estimation
Convexity
imperfect channel knowledge
max-min fairness
Minimax techniques
Multiple access
Optimization
precoder design
Quality of service
Rate-splitting multiple access (RSMA)
Receivers
Robustness
Simulation
Splitting
ISSN:0018-9545, 1939-9359
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Zusammenfassung:Rate-splitting multiple access (RSMA) is a key enabling technology for beyond 5 G networks due to its robustness against imperfect channel knowledge. In this paper, we consider both the imperfect channel state information (CSI) at the receiver (CSIR) and imperfect CSI at the transmitter (CSIT) and propose a max-min fairness optimization framework relying on RSMA to guarantee each user's minimum level of quality of service (QoS). First, we formulate the max-min fairness optimization problem that has non-convexity. To transform the non-convex problem into a convex problem, we apply the semi-definite relaxation (SDR) and convex-concave procedure (CCP) to the proposed algorithm. From simulation results, we confirm that RSMA is still a robust scheme over conventional multiple access schemes for both imperfect CSIT and CSIR.
Bibliographie:ObjectType-Article-1
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ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2022.3206808