Virtual cell interference alignment in ultra dense network

It's highly possible that the future wireless communication system adopts a ultra dense deployment to cope with the increasing demand on spectral and energy efficiency. The prerequisite of the forecasted benefits brought by the ultra dense network is that the complex inter-site interference is well undertaken. This paper aims to tackle the interference in ultra dense network utilizing the well studied interference alignment in one user-centric virtual paradigm. Virtual cell clusters are firstly constructed by building the interference list so that interference alignment with different virtual cell clusters can be designed at the user equipment. Then transmit and receive beamforming matrices can be designed for all user equipments in order to cancel out the interference signals by using minimum mean square error algorithm. Simulation results show that the proposed interference alignment scheme achieves much better performance than the zero-forcing and maximum rate transmission precoding.