Concept design of three-dimensional modulation using beam hopping for 5G networks

Abstract

In this paper, a novel transmission scheme which is called three-dimensional modulation using beam hopping (3DModBH) and a new receiver algorithm are suggested. The new concepts improve the spectral efficiency and the reliability of the transmit signals of 5G networks by using the spatial domain of multiple small cells. The main distinguishing feature of 3DModBH transmission scheme is that it maps additional information bits by exploiting the spatial domain of multiple small cells or base stations (BSs). More specifically, the suggested 3DModBH uses the conventional two-dimensional (2-D) modulation techniques plus the spatial domain of multiple small cells or BSs to transmit the information bits, whereas the state-of-the-art transmission scheme (SoAT) uses only the conventional 2-D modulation techniques to transmit the data. We demonstrate the advantages of the novel scheme in small cell scenario under strong interference in 5G networks. We propose a new receiver algorithm to detect the transmitted information bits in practical interference limited scenario. The performance of 3DModBH scheme and the suggested receiver are compared with the SoAT in term of average bit error rate, receiver complexity, and average bits per channel use in practical 5G scenario.