Rate-splitting for intelligent reflecting surface-assisted CR-NOMA systems
Open Access
- 1 February 2023
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Communications and Networks
- Vol. 25 (1), 15-24
- https://doi.org/10.23919/jcn.2022.000053
Abstract
Intelligent reflecting surface (IRS) has been regarded as promising technique to improve system performance for wireless communications. In this paper, we propose a ratesplitting (RS) scheme for an IRS-assisted cognitive radio-inspired non-orthogonal multiple access (CR-NOMA) system, where the primary user's (PU's) quality of service (QoS) requirements must be guaranteed to be same as in orthogonal multiple access. Assisted by IRS, the threshold for the PU's tolerable interference power is improved, which in turn makes it possible to increase the achievable rate for the secondary user (SU). The optimal transmit power allocation, target rate allocation, and successive interference cancellation (SIC) decoding order are jointly designed for the proposed RS scheme. Taking into account the statistics of the direct link and IRS reflecting channels, closed-form expression for the PU's and SU's outage probabilities are respectively derived. Various simulation results are presented to clarify the enhanced outage performance achieved by the proposed RS scheme over the existing CR-NOMA and IRS-assisted CR-NOMA schemes.Keywords
This publication has 31 references indexed in Scilit:
- On the Impact of Phase Shifting Designs on IRS-NOMAIEEE Wireless Communications Letters, 2020
- Rate Splitting for Uplink NOMA With Enhanced Fairness and Outage PerformanceIEEE Transactions on Wireless Communications, 2020
- Pairing Distance Resolution and Power Control for Massive Connectivity Improvement in NOMA SystemsIEEE Transactions on Vehicular Technology, 2020
- Intelligent Reflecting Surface-Enhanced OFDM: Channel Estimation and Reflection OptimizationIEEE Wireless Communications Letters, 2019
- Towards Smart and Reconfigurable Environment: Intelligent Reflecting Surface Aided Wireless NetworkIEEE Communications Magazine, 2019
- Ensuring Max–Min Fairness of UL SIMO-NOMA: A Rate Splitting ApproachIEEE Transactions on Vehicular Technology, 2019
- Reconfigurable Intelligent Surfaces for Energy Efficiency in Wireless CommunicationIEEE Transactions on Wireless Communications, 2019
- On the Performance of Network NOMA in Uplink CoMP Systems: A Stochastic Geometry ApproachIEEE Transactions on Communications, 2019
- Simple Semi-Grant-Free Transmission Strategies Assisted by Non-Orthogonal Multiple AccessIEEE Transactions on Communications, 2019
- Impact of User Pairing on 5G Nonorthogonal Multiple-Access Downlink TransmissionsIEEE Transactions on Vehicular Technology, 2015