Partial Interference Alignment in Heterogeneous Networks

Heterogeneous networks have been developed to improve spectral efficiency of cellular wireless networks. Interference among heterogeneous networks decrease the spectral effeciency. In this paper, we propose a partial interference alignment in heterogeneous networks which requires only partial channel knowledge and simple computation. The proposed scheme provides interference-free communications for a macro UE which suffers from pico BSs´ strong interference. Although pico UEs are still interference-limited, achievable rate loss is small since they experience weak interference. Numerical results show that the proposed scheme has a reasonable sum capacity and achievable rate compared to that of IA or CoMP-JT.