Optimization of Rate Allocation and Power Control for Rate Splitting Multiple Access (RSMA)

In this paper, the sum-rate maximization problem is studied for wireless networks that use downlink rate splitting multiple access (RSMA). considered model, base station (BS) divides messages can be transmitted to its users into a “private” part and “common” part. Here, common message want receive private dedicated only specific user. The RSMA mechanism enables BS adjust split of so as control interference by decoding treating noise and, thus optimizing data users. To maximize users' sum-rate, network determine allocation meet demand, transmit power reduce interference. This formulated an optimization whose goal all solve nonconvex with single-antenna BS, optimal used transmitting first obtained in closed form given power. Based on power, then derived under fixed Subsequently, iterative algorithm proposed obtain suboptimal solution multiple-antenna successive convex approximation method utilized. Simulation results show achieve up 15.6% 21.5% gains terms compared non-orthogonal (NOMA) orthogonal frequency-division (OFDMA), respectively.