Device-to-Device underlay cellular network based on rate splitting

We consider rate splitting and interference cancelation in Device-to-Device (D2D) communications underlaying a cellular network. We assume that a transmitted message is split into a private and a public part, as in Han-Kobayashi scheme. The private part is decodable only by the intended receiver, whereas the public part is in addition decodable by an interference victim. The receivers run a best-effort Successive Interference Cancelation (SIC) algorithm, canceling interfering public signals. We derive the optimal rate splitting factors for most of the categorized channel conditions in a two-link scenario. We use the rate splitting scheme for resource sharing in a two-link D2D underlay cellular network. The results show that rate splitting resource sharing achieves higher sum rate than resource sharing schemes which are based on power control or orthogonal resource allocation, including the traditional cellular mode.