Abstract
Intelligent reflecting surface (IRS) has recently emerged as a promising technology for 6 G wireless systems, due to its capability to reconfigure the wireless propagation environment. In this paper, we investigate a Rate-Splitting Multiple Access (RSMA) for IRS-assisted downlink system, where the base station (BS) communicates with single-antenna users with the help of an IRS. RSMA relies on rate-splitting (RS) at the BS and successive interference cancellation (SIC) at the users and provides a generalized multiple access framework. We derive a new architecture called IRS-RS that leverages the interplay between RS and IRS. For performance analysis, we utilize an on-off control technique to control the passive beamforming vector of the IRS-RS and derive the closed-form expressions for outage probability of cell-edge users and near users. Moreover, we also analyze the outage behavior of cell-edge users for a sufficiently large number of reflecting elements. Additionally, we also analyze the outage performance of cooperative RS based decode-and-forward (DF)-assisted framework called DF-RS. Through simulation results, it is shown that the proposed framework outperforms the corresponding DF-RS, RS without IRS and IRS-assisted conventional non-orthogonal multiple access (NOMA) schemes. Furthermore, the impact of various system's parameters such as the number of IRS reflecting elements and the number of users on the system performance is revealed.
Highlights
D UE to the advancement of radio frequency (RF) microelectro-mechanical systems (MEMS) along with the plentiful applications of the reconfigurable and programmable metasurfaces [1], [2], intelligent reflecting surface (IRS) has recently attracted wide attention from both industry and academia
Motivated by the aforementioned discussions and considering the fact that IRS will play a pivotal role in the next-generation (i.e., Beyond 5G (B5G) and 6G) wireless networks as a cost, power and spectrum efficient technology, in this work, we consider a multi-user single-antenna downlink environment, where users are divided into a near users and cell-edge users and IRSs are deployed near to cell-edge and only the cell-edge users are served by the IRSs equipped with N passive reflecting elements
The simulation and analytical results for the outage behavior of IRS-assisted multi-user downlink communication system with RS are presented
Summary
D UE to the advancement of radio frequency (RF) microelectro-mechanical systems (MEMS) along with the plentiful applications of the reconfigurable and programmable metasurfaces [1], [2], intelligent reflecting surface (IRS) has recently attracted wide attention from both industry and academia. Multiple low-cost programmable reflecting elements are deployed at IRS, wherein each reflecting element has capability to adjust the phase of each passive antenna element. Of the impinging signals and it gains huge advantages over conventional relaying protocols [3]– [5]. [6] has pointed out IRS as one of the remedies for improving the spectrum efficiency and energy efficiency in 6G wireless communication network
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