  Rate-Splitting Multiple Access (RSMA) is a robust multiple access scheme for
downlink multi-antenna wireless networks. RSMA relies on multi-antenna
Rate-Splitting (RS) strategies at the transmitter and Successive Interference
Cancellation (SIC) at the receivers. RSMA manages interference by partially
decoding interference and partially treating interference as noise. RSMA has
been shown to achieve significant gain in terms of spectral efficiency, energy
efficiency, Quality-of-Service enhancements, robustness to Channel State
Information (CSI) imperfections due to imperfect channel estimation and
mobility, as well as feedback overhead and complexity reduction, in a wide
range of network loads (underloaded and overloaded regimes) and user
deployments (with a diversity of channel directions, channel strengths and
qualities). In this work, we investigate a novel application of RSMA for joint
communications and jamming with a Multi-Carrier (MC) waveform in Multiple Input
Single Output (MISO) Broadcast Channel (BC). Our aim is to simultaneously
communicate with Information Users (IU) and jam Adversarial Users (AU) to
disrupt their communications in a setting where all users perform broadband
communications by MC waveforms in their respective networks. We consider the
practical setting of imperfect CSI at transmitter (CSIT) for the IUs and
statistical CSIT for AUs. The optimal information and jamming precoders are
designed to maximize the Sum-Rate (SR) under jamming energy constraints on the
pilot subcarriers of AUs, a jamming method considered to be among the most
destructive methods for MC waveforms under the considered system model. We
compare the SR performance of RSMA and Space Division Multiple Access (SDMA)
schemes by numerical results to demonstrate that RSMA achieves a significant SR
gain compared to SDMA.
