Performance Assessment of Interference Alignment with Imperfect Channel State Information
08 October 2012
It has been shown that Interference Alignment (IA) based transmit precoding achieves remarkable performance gains with the help of inter-cell coordination in cellular networks. These gains are shown mostly under ideal assumptions like the availability of perfect channel state information (CSI) and fully uncorrelated channels. In this work, we have derived a simple CSI model for a 3GPP compliant system level simulator which is using spatial channel model for the generation of channel coefficients. We have evaluated the performance of IA using two different receiver algorithms based on ideal and practical realizations. We have further compared the performance of IA with two other baseline state-of-art coordinated and noncoordinated precoding schemes. Our results have shown that the gains of IA are very sensitive to CSI imperfections as compared to the other baselines. However, in case of the availability of high SINRs, IA outperforms the other schemes even with imperfect CSI. Moreover, we found out that the ideally realized receiver algorithm although have relatively a very high loss with imperfections but it still outperforms the practical receiver. I. INTRODUCTION
