Abstract:

As a potential interference management strategy, interference alignment (IA) can achieve degree of freedom that is linear to the number of users in systems. However, the perfect instantaneous global channel state information (CSI) is required in order to implement IA effectively, which makes the practical usage of IA face many challenges. In terms of this issue, a limited feedback IA algorithm based on linear dispersion space-time code for multi-cell cellular systems is proposed. The main idea of it is to cascade the design of precoding and linear dispersion space-time coding. The interference can be eliminated completely by properly designing precoding matrix, linear dispersion space-time code block and receiving matrix with CSI feedback of only one user. Simulation results verify that the proposed algorithm can not only decrease the feedback overhead significantly, but also eliminate interference completely compared with the existing works.