Non-orthogonal multiple access (NOMA) is a promising multiple access technique for future wireless communications as it results in high spectral efciency. In this paper, we study a NOMA based dual-hop X-relay system, where a decode-and- forward relay assists the communication between the sources and the destinations. We assume that the statistical channel state information is known to the network. In such an assumption, the achievable sum-rate at high signal-to-noise ratio is further solved in closed form. Especially, the corresponding power allocation schemes, including the theoretically optimal and practical suboptimal ones, are proposed. Analyses and simulation results show that in the considered system, NOMA signicantly outperforms the conventional orthogonal multiple access schemes in terms of sum-rate performance, especially when channel's near-far effect is signicant.
Non-Orthogonal Multiple Access for Dual-Hop Decode-and-Forward Relay-Aided X Channel
01.06.2017
255993 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch