Opportunistic vector perturbation with superposition signalling

In this letter, we first put forward a new basic problem to the famous vector perturbation (VP) precoding that whether the extended constellation of VP could transmit more information bits. Then, we propose an opportunistic vector perturbation (OVP) precoding with superposition signalling scheme, which is aimed at getting the performance of VP closer to capacity limit. The main idea is using subsequent recoverable data symbol vector to perturb currently transmitting data symbol vector opportunistically. Analysis and simulation results show that the proposed OVP can transmit more valid information bits than conventional VP at the same transmit power, modulation order and number of antennas.