NOMA for 5G
A recently proposed method for the mobile 4.5G and 5G systems is ”non-orthogonal multiple access” (NOMA). This project aims at researching NOMA from a theoretical perspective in close collaboration with HiSilicon (subsidiary of Huawei) in Lund. Contemporary communication systems are based on cells where a base station is placed in the center of each cell. To serve a large number of mobile terminals it is common practice to allocate orthogonal resources to each terminal. These resources are in practice time, frequency, or spatial resources. Recently it has been proposed (NOMA) to serve a number of terminals with the same resource, i.e., the base station transmits signals to two or more terminals in the same time-frequency-spatial slot. This brings about interference among terminals, but also to performance gains if the interference can be controlled/ cancelled. The goals of this project are: 1) To provide a theoretical understanding of fundamental communication theoretic properties of NOMA, e.g., to understand the capacity region. 2) To research semi-orthogonal multiple access (SOMA), a special case of NOMA proposed by Huawei. 3) To research suitable modulation techniques and pilot structures.4) To research suitable receiver structures to equalize the interference among terminals. 5) To propose suitable scheduling algorithms to select users to be served with the same resources. 6) Evaluate NOMA with a large number of antennas at the base station.